co2 optics catalog

Transcription

co2 optics catalog

JAPAN
Ophir Japan Ltd. - OJ
3-43 Kishiki-cho, Omiya-Ku
Saitama-shi, Saitama, 330-0843
Japan
Tel.
81-48-646-4150
Fax.
81-48-646-4155
e-mail: [email protected]
www.ophirjapan.co.jp
CO2
OPTICS
CATALOG
International Headquarters
U.S.A.
Ophir Optronics Ltd.,
Science Based Industrial Park,
P.O.B. 45021, Jerusalem 91450
Israel
Tel. 972-2-5484444
Fax. 972-2-5822338
www.ophiropt.com
Ophir Optics Inc. - OPI
1600 Osgood Street
North Andover, MA 01845
USA
Tel. 800-820-0814
Fax. 978-657-6056
www.ophiropt.com
CO2 Optics Catalog 2009 - 2010
GERMANY
Ophir Optronics GmbH - OPG
Alter Kirchweg 1 31627 Rohrsen
Germany
Tel.
49-5024-9818-0
Fax.
49-5024-9818-18
www.ophiropt.de
A Cut Above The Rest
TABLE OF
CONTENTS
Ophir Optronics
About Ophir
2
Thin Film Coating
Tutorial
7
Coating Table
8-9
Tutorial
Focusing Lenses
Duralens
Cutting Head Optics
13
15
TM
TM
Black Magic
16
TM
Clear Magic
17
EZ Mount for Amada Machines
18
EZ Kit
19
General Specifications
Focusing Lenses
20
Parts
Meniscus
21
Plano-Convex
25
Meniscus Mounted
29
Plano-Convex Mounted
30
Tutorial
35
Mirrors
36
38
Parts
Zero Phase shift
41
90° Phase shift
43
Windows
44
Telescope mirrors
45
Tutorial
49
50
Parts
End Mirrors
52
Total Reflectors
53
Output couplers
54
"Protecting your optic investment"
57
Mounted Lenses
TM
TM
Beam Delivery Optics
Cavity Optics
Maintenance
Cleaning and Handling
by Todd Jacobson
"Good Mode Quality"
58
by Scott Kiser
Methods for CO2 Optics
60
Cleaning Kit
62
EZ CleanTM
Wipes for Lens Cleaning and 63
Cleaning Holder
Comet
Lens Cleaning Instructions
64
65
OPHIR
OPTRONICS
About Ophir
Incorporated in 1976, Ophir Optronics is an international
Ophir’s manufacturing sites in Israel and the USA, and sub-
leader in precision IR optics and laser measurement equip-
sidiaries in Germany, Switzerland and Japan team more than
ment.
515 scientists, engineers and technical support personnel
Ophir has two optical manufacturing plants of 60,000 sq.ft. in
providing service to thousands of customers worldwide.
Israel and over 30,000 sq.ft. in the USA.
Since 1991, Ophir Optronics Ltd. is publicly traded in the Tel-
Its main business lines are:
Aviv stock exchange.
• Optics Group: designs, manufactures and markets optical
IR components and lens assemblies.
• Laser Measurement Group: manufactures, calibrates and
sells a complete line of laser measurement instruments
for measuring power, energy, beam profile and spectrum.
• Optimet (Optical Metrology Ltd.): an Ophir subsidiary,
develops and manufactures non-contact, 3-D measure
ment sensors.
2
For latest updates please visit our website: www.ophiropt.com
OPHIR
OPTRONICS
About Ophir
Optics Group
Optics In Co2 Lasers
We provide: “The Best of All Possible Solutions”
Ophir Optronics produces a full range of Optics of unsur-
Ophir’s Optics Group is a designer and supplier of precision
passed quality for high power CO2 industrial lasers. Our
IR optics for defense, commercial IR vision, FLIR, and indus-
superb replacement optics and OEM optics include:
trial CO2 laser customers.
Cutting Head Optics Focusing Lenses: DuralensTM, BlackMagicTM, ClearMagicTM
Areas of Expertise:
Mounted Lenses: EZ MountTM and EZ KitTM
• Optical Lens Assemblies for MWIR & LWIR, Cooled and Beam Delivery Optics -
Uncooled Cameras
0° and 90° phase shift mirrors (silicon and copper), ATFR
• IR Optical Components (BTP)
mirrors, Telescopic mirrors as well as Windows.
• Optics for High Power CO2 Industrial Lasers
Cavity Optics -
Our CO2 Optics Group produces a full range of OEM and
Output Couplers, End mirrors and Total reflectors
replacement optics including beam-delivery and cavity op-
We also provide maintenance accessories such as:
tics as well as windows. Ophir provides the highest quality
Cleaning Kit, EZ CleanTM wipes and Cleaning holders.
CO2 optics at the best price. The second largest OEM sup-
* Data and information in this catalog are provided solely for
plier in the world, all manufacturing is done in-house using
informative purposes. Specifications are of typical values.
automated CNC technology assuring complete uniformity.
Although we aim to keep Ophir catalogs accurate and up-to-
Driven by innovation, we’ve produced a longer lasting lens,
date, details may change without notice.
radioactive free coating, called Black Magic . Our commit-
Ophir accepts no responsibility or liability whatsoever
ment to the customer is second to none, with a global dis-
with regard to the information in this catalog.
tribution and support network. This unwavering commitment
For the latest information please refer to our website:
to forward thinking helps keep us “a cut above the rest”.
www.ophiropt.com
TM
For more information, visit www.ophiropt.com
3
4
THIN FILM
COATING
6
THIN FILM
COATING
Tutorial
Resonator Coatings:
The optical elements for CO2 lasers offer a great challenge
for optical manufacturers. The need for high quality optical
• Output Couplers: 30%-70% (standard)
surfaces combined with low absorption coatings has left the
• End Mirrors: 99.5%-99.7%
market with only few manufacturers who meet the challenge.
• Folding Mirrors:
Ophir Optronics offers a wide selection of lenses and mirrors
• MMR
with high performance coatings that were tested by many
• MMR-A
laser producers. Ophir was chosen for quality by major OEM
• MMR-P
companies.
• PLM
Our substrates include ZnSe lens and output couplers, Si mir-
Lens Coatings:
rors, GaAs end mirrors and also Cu mirrors. The optics are
cleaned and coated in a clean room environment.
• AR Absorption <0.2% (standard)
• Clear Magic Absorption <0.13% (low absorption)
Beam Delivery Coatings:
• Black Magic Absorption <0.15% (low absorption)
• MMR
• ATFR
• 90° Phase Shift
• Zero Phase Shift
7
THIN FILM
COATING
Coatings
Table
BEAM DELIVERY
ZPS
90PS
PS
ES
%R @ 0º AOI@ 10.6µm
NA
NA
99.1
99.6
* S-Pol @ 10.6µm
99.5
98.0
99.4
99.7
* P-Pol @ 10.6µm
NA
NA
98.8
99.2
* R-Pol @ 0.6328µm
80
80
95
~60-95
Phase Retardation Tolerance
<2º
90°±3°
6°-9°
NA
* %R@45º AOI
8
THIN FILM
COATING
Coatings
Table
CAVITY OPTICS
MMR
MMR-A
MMR-H
MMR-P
99.8
99.8
99.8
99.8
99.9
99.9
99.8
99.9
99.7
99.7
99.6
99.8
40
40
80
65
<2°
<2°
NA
<2°
9
10
CUTTING
HEAD
OPTICS
12
CUTTING
HEAD
OPTICS
Tutorial
Focal length and mounting distance
Spherical aberration
In general, there are two types of focusing lenses: planoconvex lenses which have one convex surface (convex =
dome-like curvature) and one flat surface, and meniscus
lenses which have one convex surface and one concave
surface (concave = hollow curvature). In most laser cutting
machines, meniscus lenses are used because they produce
a smaller focus diameter (see next section). In some machines, plano-convex lenses are used because their production costs are a little bit lower.
Spherical aberration means that the focus position of the
outer portion of the laser beam is closer to the lens than the
focus position of the inner portion (see picture). As a consequence, the focus diameter is not zero, but has some extension which can be calculated by the following formulas:
For a laser user who thinks about replacing a plano-convex
lens by a meniscus lens, it is important to check if the focus
position can be adjusted correctly. Even if a plano-convex
lens and a meniscus lens have same diameter, thickness and
focal length, the focus position of the meniscus lens can be
several mm higher if compared to the plano-convex lens.
Reason is that the focal length of a lens is defined as the distance between the focus and the so-called principal plane.
The principal plane is defined according to a scientific rule
and is located somewhere inside the lens. For checking the
position of the focus in a laser cutting head, it is much more
useful to know the “Mounting distance” of the lens. It is defined as the distance between the edge of the lower surface
and the focal plane and therefore connected directly to the
position of the focus within the cutting head.
df = 0.0286 (din)3 / (FL)2 (plano-convex lenses)
df = 0.0187 (din)3 / (FL)2 (meniscus lenses)
df = focus diameter, din = diameter of incoming beam,
FL = focal length
Example: din = 20 mm, FL = 3.75”:
>>> df = 0.025 mm (plano-convex lens)
>>> df = 0.017 mm (meniscus lens)
The example shows that meniscus lenses produce smaller
focus diameters than plano-convex lenses. The difference is
significant especially at large beam diameters and short focal lengths. In order to minimize this effect, meniscus lenses
are used in most laser cutting systems. In most practical applications, however, there is a second and much more important effect which influences the focus diameter. It is called
diffraction and described in the next section.
din
If the mounting distance of a replacement lens is different
from the mounting distance of the original lens, it might happen that the focus position is shifted such that it cannot be
corrected within the adjustment range of the cutting head. On
the other side, it is possible to extend the adjustment range
by using lenses with different mounting distances.
din
df
13
df
CUTTING
HEAD
OPTICS
Tutorial
Diffraction
Absorption and thermal lensing
A laser beam is an electromagnetic wave and therefore has
properties similar to water waves or sound waves. One consequence of this wave-like nature is that a laser beam cannot be focussed to a sharp point. Instead the focus has a spot
size which can be calculated as follows:
During laser operation with several kilowatts, the focusing
lens is heated because it absorbs a small portion of the laser power. Absorption takes place mainly in the AR coatings
and at dirt on the lens. At a new clean lens with standard
AR coating, absorption is typically 0.2% of the incoming laser
power. A lens with Ophir’s BLACK Magic coating has absorption 0.15%. During use in a laser cutting machine, absorption
increases gradually due to increasing amounts of dirt on the
lower surface. When the lens needs to be replaced, absorption usually is in the range 0.3 to 0.4%.
df = (4/π) M2 λ FL / din
df = focus diameter, M2 = beam quality, λ =
laser wavelength,
FL = focal length of focussing lens, din =
diameter of incoming beam
Examples: (λ = 10.6 µm, M1 = 2)
din = 20 mm, FL = 7.5”
din = 20 mm, FL = 3.75” >> df = 0.065 mm
Heating of the lens causes additional surface curvature due
to thermal expansion and increases the refractive index of
the lens material. As a consequence of these effects, the
lens focal length becomes shorter, and the focus position
cannot be predicted exactly because it depends on many parameters like laser power, intervals laser on/off, cleanliness
of lens, and others. Therefore, use of lenses with reduced
absorption can make the focal length more stable and therefore improve reliability of the cutting process.
>> df = 0.13 mm
First of all, the example shows that focus diameters are much
larger than the values calculated in the section above. This
means that in most cutting applications, spherical aberration
can be neglected. Diffraction is therefore the most important
effect concerning focus diameters.
If there are dirt particles on the lens, the lens material is not
heated uniformly, but mainly at the areas close to these dirt
particles. As a consequence, focusing properties become
worse, focus diameter increases, and cutting quality decreases. So if a certain “critical” amount of dirt has accumulated on the lens, it needs to be replaced. However, it might
still work fine at reduced laser power.
In general, the formula shows that by decreasing the focal
length, the focus diameter is decreased as well, with the consequence that the intensity of the laser beam is increased.
As high laser intensity is useful in most cutting applications,
focal length should be as short as possible. However, a short
focal length has the disadvantage that the beam diameter
increases rapidly above and below the focus. Therefore,
maximal thickness of materials which can be cut efficiently
is very limited, and the optimal focal length increases with
increasing thickness of material.
14
CUTTING
HEAD
OPTICS
Focusing
Lenses
High Quality Lenses for High Power CO2 Lasers
Highlights:
• Compatible with all major laser systems in the market
• Approved and used by leading OEMs
• Designed for high durability and accuracy
- Manufactured by automated CNC technology to assure complete uniformity
• Manufactured according to the highest precision
specifications
- Absorption ≤ 0.2%
• All manufucturing is done in-house
15
DuralensTM
CUTTING
HEAD
OPTICS
Focusing
Lenses
Black MagicTM
Low Absorption Lenses for
High Power CO2 Lasers
• Guaranteed absorption <0.15% - constant throughout the lens lifetime
- Maximum focus stability
• Toughest coating in the industry. Remarkable Durability
- Best ability to withstand back spatter
- Easier to clean and maintain
- Resistant to humidity
• Recommended and approved by leading OEMs
- Used for all high powered CO2 lasers including those over 5KW
• Radioactive free coating
• Excels in cutting aluminum and stainless steel
• Best cost-benefit ratio
16
CUTTING
HEAD
OPTICS
Focusing
Lenses
Clear MagicTM - Transparent Ultra Low Absorption
Lens for High-Power CO2 Laser Systems
Ophir offers the lowest Guaranteed absorption for ZnSe
lenses.
The Clear Magic’s maximum Absorption level will never exceed 0.13% - and is assured for each and every lens sold.
As Ophir’s Black MagicTM lens is known for high durability
and long life expectancy, we have been focusing our efforts
on developing a transparent ultra low absorption lens that
duplicates the unique performance of the Black MagicTM lens
while providing the benefits of a transparent coating.
The new and innovative Clear MagicTM maintained the top
layer of the Black MagicTM, which offers better cleaning
properties and the highest scratch resistance.
In addition, the Clear MagicTM allows the customer to see
the HeNe beam on the work piece and to check thermally
induced stress through the polarizing filters.
This coating is now available in 1.5” and 2” diameter for most
popular OEM systems.
17
Clear MagicTM
CUTTING
HEAD
OPTICS
Mounted
Lenses
EZ MountTM
for Amada
Machines
Ophir Optronics’ CO2 Optics Group Produces Full
Line of Reusable Lens Mounts for Amada CO2
Laser Equipment
EZ-MountTM enables operators to change a lens, without
replacing the mount, on any Amada machine.
Without any screws or small springs to contend with,
EZ-MountTM features a turn-to-open mechanism enabling
quick, safe removal of lenses for on-the-spot cleaning,
focal length adjustment or replacement. With EZ-MountTM,
an O-Ring replaces the potentially toxic indium wire used in
traditional mounts. It is also more cost-effective than traditional mounts because it is completely reusable and saves
time on lens maintenance.
18
CUTTING
HEAD
OPTICS
Mounted
Lenses
EZ KitTM
EZ KitTM
The Ophir’s EZ kitTM is designed for the Amada users to sup-
The kit includes the following items:
ply yearly lens need.
Focusing Lens Holder – EZ MountTM
It comes in a convenient package to maintain and store the
4 Ophir’s Focusing Lenses – chosen by the user
items after using it.
Cleaning Lens Holder
For the benefit of our customer, there is a flexible lens
Finger cots
choice. You are allowed to choose 4 focusing lenses from
our variety.
19
CUTTING
HEAD
OPTICS
General
Focusing
Specifications Lenses
Dimensions
EFL Range
38-381mm
Edge Thickness
2-15mm
ET Tolerance
±0.1mm
Diameter Range
10-100mm
Diameter Tolerance
+0.0 / -0.1mm
Clear Aperture
≥90%
Surface Irregularity
0.5 F @ 0.633µm
Surface Figure
2 F @ 0.633µm
ETV
<0.025mm
AR Coating
Transmission
>99.3%
Absorption
< 0.2%
Reflection
<0.25% per surface
AOI
0°-15°
LA
ULA
< 0.15%
< 0.13%
LA Series (Black MagicTM Low Absorption Lenses)
Transmission
>99.35%
Absorption
<0.15%
Reflection
<0.25% per surface
AOI
0°-15°
* Spec are valid for Meniscus and Plano-Convex lenses
20
CUTTING
HEAD
OPTICS
Parts
Meniscus
Diameter
Focal Length
Inch
Inch
mm
1.1"
5.0"
0.11"
2.70
LA
1.1"
5.0"
0.11"
2.70
LA
1.1"
3.75"
0.08"
2.00
60924
1.1"
2.5"
0.12"
3.00
Meniscus
60995
1.1"
10.0"
0.11"
2.90
Meniscus
61526
1.0"
5.0"
0.10"
2.50
Meniscus
61528
1.1"
2.5"
0.09"
2.30
Meniscus
60262
1.1"
5.0"
0.20"
5.10
Meniscus
60262
1.1"
5.0"
0.20"
5.10
Meniscus
60699
1.1"
5.0"
0.17"
4.20
Meniscus
60699
1.1"
5.0"
0.17"
4.20
Meniscus
60700
1.1"
2.5"
0.17"
4.20
Meniscus
61157
1.1"
3.75"
0.17"
4.20
Meniscus
60909
1.1"
1.5"
0.20"
5.00
Meniscus
61818
1.1"
7.5"
0.24"
6.00
Meniscus
61819
1.1"
5.0"
0.24"
6.00
Meniscus
61819
1.1"
5.0"
0.24"
6.00
Meniscus
61837
1.1"
2.5"
0.24"
6.00
Meniscus
60746
1.5"
5.0"
0.09"
2.40
Meniscus
60746
1.5"
5.0"
0.09"
2.40
Meniscus
61851
1.5"
7.5"
0.12"
3.00
Meniscus
61851
1.5"
7.5"
0.12"
3.00
Meniscus
61951
1.5"
5.0"
0.12"
3.00
Meniscus
60260
1.5"
5.0"
0.24"
6.00
Meniscus
60260
1.5"
5.0"
0.24"
6.00
Meniscus
60602
1.5"
7.5"
0.24"
6.00
Optics Type
P/N
Meniscus
60866
Meniscus
60866
Meniscus
630397-117
Meniscus
LA
ULA
Inch
LA
LA
LA
LA
LA
LA
21
Edge Thickness
CUTTING
HEAD
OPTICS
Parts
Meniscus
Diameter
Focal Length
Inch
Inch
mm
1.5"
7.5"
0.24"
6.00
1.5"
3.75"
0.24"
6.00
1.5"
3.75"
0.24"
6.00
1.5"
5.0"
0.28"
7.00
1.5"
5.0"
0.28"
7.00
1.5"
5.0"
0.29"
7.30
1.5"
5.0"
0.29"
7.30
1.5"
5.0"
0.29"
7.30
1.5"
7.5"
0.29"
7.30
1.5"
7.5"
0.29"
7.30
1.5"
7.5"
0.29"
7.30
1.5"
5.0"
0.16"
4.00
1.5"
5.0"
0.16"
4.00
1.5"
7.5"
0.31"
7.87
1.5"
7.5"
0.31"
7.87
1.5"
7.5"
0.31"
7.87
61525
1.5"
2.50"
0.12"
3.00
Meniscus
61960
1.5"
10.0"
0.29"
7.36
Meniscus
61960
1.5"
10.0"
0.29"
7.36
Meniscus
61960
1.5"
10.0"
0.29"
7.36
Meniscus
61961
1.5"
8.85"
0.29"
7.40
Meniscus
61961
1.5"
8.85"
0.29"
7.40
Meniscus
61961
1.5"
8.85"
0.29"
7.40
Meniscus
61982
1.5"
5.0"
0.29"
7.40
Meniscus
61982
1.5"
5.0"
0.29"
7.40
Meniscus
61982
1.5"
5.0"
0.29"
7.40
Optics Type
P/N
LA
Meniscus
60602
LA
Meniscus
60603
Meniscus
60603
Meniscus
60618
Meniscus
60618
Meniscus
60696
Meniscus
60696
Meniscus
60696
Meniscus
60697
Meniscus
60697
Meniscus
60697
Meniscus
60973
Meniscus
60973
Meniscus
61171
Meniscus
61171
Meniscus
61171
Meniscus
ULA
Inch
LA
LA
LA
ULA
LA
ULA
LA
LA
ULA
LA
ULA
LA
ULA
LA
ULA
22
Edge Thickness
CUTTING
HEAD
OPTICS
Parts
Meniscus
Diameter
Focal Length
Inch
Inch
mm
1.5"
7.5"
0.29"
7.40
1.5"
7.5"
0.29"
7.40
1.5"
7.5"
0.29"
7.40
1.5"
3.70"
0.29"
7.40
1.5"
3.70"
0.29"
7.40
1.5"
3.70"
0.29"
7.40
1.5"
3.75"
0.35"
9.00
1.5"
3.75"
0.35"
9.00
1.5"
5.0"
0.35"
9.00
1.5"
5.0"
0.35"
9.00
1.5"
5.0"
0.35"
9.00
1.5"
7.5"
0.35"
9.00
1.5"
7.5"
0.35"
9.00
1.5"
7.5"
0.35"
9.00
1.5"
3.75"
0.28"
7.00
1.5"
3.75"
0.28"
7.00
1.5"
5.0"
0.35"
9.00
1.5"
5.0"
0.35"
9.00
1.5"
5.0"
0.35"
9.00
1.5"
7.5"
0.35"
9.00
1.5"
7.5"
0.35"
9.00
1.5"
7.5"
0.35"
9.00
60799
1.5"
2.5"
0.24"
6.00
Meniscus
61014
1.5"
5.0"
0.31"
7.87
Meniscus
61014
1.5"
5.0"
0.31"
7.87
Meniscus
61595
1.5"
7.5"
0.39"
10.0
Optics Type
P/N
Meniscus
61983
Meniscus
61983
Meniscus
61983
Meniscus
61962
Meniscus
61962
Meniscus
61962
Meniscus
60614
Meniscus
60614
Meniscus
60615
Meniscus
60615
Meniscus
60615
Meniscus
60616
Meniscus
60616
Meniscus
60616
Meniscus
60617
Meniscus
60617
Meniscus
62709
Meniscus
62709
Meniscus
62709
Meniscus
62710
Meniscus
62710
Meniscus
62710
Meniscus
LA
ULA
Inch
LA
ULA
LA
ULA
LA
LA
ULA
LA
ULA
LA
LA
ULA
LA
ULA
LA
23
Edge Thickness
CUTTING
HEAD
OPTICS
Parts
Meniscus
Diameter
Focal Length
Inch
Inch
mm
1.5"
7.5"
0.39"
10.0
1.5"
10.0"
0.35"
9.00
1.5"
10.0"
0.35"
9.00
60850
2.0"
5.0"
0.31"
7.80
Meniscus
61039
2.0"
7.5"
0.31"
8.00
Meniscus
61039
2.0"
7.5"
0.31"
8.00
Meniscus
61694
2.0"
5.0"
0.31"
8.00
Meniscus
61694
2.0"
5.0"
0.31"
8.00
Meniscus
63002
2.0"
12.5"
0.38"
9.65
Meniscus
60698
2.0"
7.5"
0.38"
9.60
Meniscus
60698
2.0"
7.5"
0.38"
9.60
Meniscus
60698
2.0"
7.5"
0.38"
9.60
Meniscus
62102
2.0"
10.0"
0.38"
9.60
Meniscus
62102
2.0"
10.0"
0.38"
9.60
Meniscus
60991
2.0"
5.0"
0.38"
9.60
Meniscus
60991
2.0"
5.0"
0.38"
9.60
Meniscus
60991
2.0"
5.0"
0.38"
9.60
Meniscus
60992
2.0"
10.0"
0.38"
9.60
Meniscus
60992
2.0"
10.0"
0.38"
9.60
Meniscus
61853
2.0"
3.75"
0.38"
9.60
Meniscus
61393
2.5"
7.5"
0.43"
11.0
Meniscus
61393
2.5"
7.5"
0.43"
11.0
Meniscus
61394
2.5"
5.0"
0.43"
11.0
Meniscus
61579
2.5"
7.5"
0.14"
3.50
Optics Type
P/N
LA
Meniscus
61595
LA
Meniscus
61973
Meniscus
61973
Meniscus
ULA
Inch
LA
LA
LA
LA
ULA
LA
LA
ULA
LA
LA
24
Edge Thickness
CUTTING
HEAD
OPTICS
Parts
Plano-Convex
Diameter
Focal Length
Inch
Inch
mm
60990
1.1"
5.0"
0.12"
3.00
Plano-convex
61161
1.1"
5.0"
0.16"
4.00
Plano-convex
61161
1.1"
5.0"
0.16"
4.00
Plano-convex
61162
1.1"
7.5"
0.16"
4.00
Plano-convex
61564
1.0"
12.5"
0.19"
4.80
Plano-convex
61829
1.0"
15.0"
0.19"
4.80
Plano-convex
61013
1.0"
10.0"
0.12"
3.00
Plano-convex
61210
1.1"
7.5"
0.24"
6.00
Plano-convex
61211
1.1"
5.0"
0.24"
6.00
Plano-convex
60830
1.5"
5.0"
0.12"
3.00
Plano-convex
60830
1.5"
5.0"
0.12"
3.00
Plano-convex
60907
1.5"
3.5 "
0.12"
3.00
Plano-convex
60935
1.5"
3.75"
0.12"
3.00
Plano-convex
60949
1.5"
7.5"
0.10"
2.50
Plano-convex
61163
1.5"
5.0"
0.16"
4.00
Plano-convex
61163
1.5"
5.0"
0.16"
4.00
Plano-convex
61163
1.5"
5.0"
0.16"
4.00
Plano-convex
61164
1.5"
7.5"
0.16"
4.00
Plano-convex
60784
1.5"
7.5"
0.24"
6.00
Plano-convex
60329
1.5"
7.5"
0.24"
6.00
Plano-convex
60770
1.5"
5.0"
0.24"
6.00
Plano-convex
60770
1.5"
5.0"
0.24"
6.00
Plano-convex
60882
1.5"
7.5"
0.29"
7.40
Plano-convex
60882
1.5"
7.5"
0.29"
7.40
Plano-convex
60883
1.5"
5.0"
0.29"
7.40
Plano-convex
60883
1.5"
5.0"
0.29"
7.40
Optics Type
P/N
Plano-convex
LA
ULA
Inch
LA
LA
LA
ULA
LA
LA
LA
LA
25
Edge Thickness
CUTTING
HEAD
OPTICS
Parts
Plano-Convex
Diameter
Focal Length
Inch
Inch
mm
60884
1.5"
3.75"
0.29"
7.40
Plano-convex
60905
1.5"
5.0"
0.30"
7.60
Plano-convex
60905
1.5"
5.0"
0.30"
7.60
Plano-convex
60905
1.5"
5.0"
0.30"
7.60
Plano-convex
60906
1.5"
7.5"
0.31"
8.00
Plano-convex
60906
1.5"
7.5"
0.31"
8.00
Plano-convex
60906
1.5"
7.5"
0.31"
8.00
Plano-convex
61001
1.5"
5.13"
0.28"
7.11
Plano-convex
61001
1.5"
5.13"
0.28"
7.11
Plano-convex
61001
1.5"
5.13"
0.28"
7.11
Plano-convex
61002
1.5"
7.63"
0.31"
8.00
Plano-convex
61002
1.5"
7.63"
0.31"
8.00
Plano-convex
61002
1.5"
7.63"
0.31"
8.00
Plano-convex
61827
1.5"
15.0"
0.31"
8.00
Plano-convex
61857
1.5"
3.63"
0.28"
7.20
Plano-convex
62649
1.5"
7.5"
0.31"
7.80
Plano-convex
62649
1.5"
7.5"
0.31"
7.80
Plano-convex
62649
1.5"
7.5"
0.31"
7.80
Plano-convex
62670
1.5"
5.0"
0.31"
7.80
Plano-convex
62670
1.5"
5.0"
0.31"
7.80
Plano-convex
62670
1.5"
5.0"
0.31"
7.80
Plano-convex
60885
1.5"
2.5"
0.29"
7.40
Plano-convex
62728
2.0"
5"
0.31"
7.90
Plano-convex
62728
2.0"
5"
0.31"
7.90
Plano-convex
62728
2.0"
5"
0.31"
7.90
Plano-convex
62729
2.0"
7.5"
0.31"
7.90
Optics Type
P/N
Plano-convex
LA
ULA
Inch
LA
ULA
LA
ULA
LA
ULA
LA
ULA
LA
LA
ULA
LA
ULA
LA
ULA
26
Edge Thickness
CUTTING
HEAD
OPTICS
Parts
Plano-Convex
Diameter
Focal Length
Inch
Inch
mm
2.0"
7.5"
0.31"
7.90
2.0"
7.5"
0.31"
7.90
2.0"
7.5"
0.29"
7.40
2.0"
7.5"
0.29"
7.40
2.0"
5.0"
0.31"
8.00
2.0"
5.0"
0.31"
8.00
2.0"
5.0"
0.31"
8.00
2.0"
7.5"
0.31"
8.00
2.0"
7.5"
0.31"
8.00
2.0"
7.5"
0.31"
8.00
2.0"
8.75"
0.33"
8.50
2.0"
8.75"
0.33"
8.50
2.0"
8.75"
0.33"
8.50
2.0"
7.63"
0.38"
9.65
2.0"
7.63"
0.38"
9.65
62172
2.0"
6.16"
0.31"
8.00
Plano-convex
62192
2.0"
10.0"
0.31"
7.90
Plano-convex
62192
2.0"
10.0"
0.31"
7.90
Plano-convex
60911
2.0"
7.5"
0.38"
9.60
Plano-convex
60911
2.0"
7.5"
0.38"
9.60
Plano-convex
61405
2.0"
7.5"
0.38"
9.60
Plano-convex
61405
2.0"
7.5"
0.38"
9.60
Plano-convex
61405
2.0"
7.5"
0.38"
9.60
Plano-convex
61019
2.0"
5.0"
0.38"
9.60
Plano-convex
61019
2.0"
5.0"
0.38"
9.60
Plano-convex
61019
2.0"
5.0"
0.38"
9.60
Optics Type
P/N
LA
Plano-convex
62729
LA
Plano-convex
62729
Plano-convex
60950
Plano-convex
60950
Plano-convex
61003
Plano-convex
61003
Plano-convex
61003
Plano-convex
61004
Plano-convex
61004
Plano-convex
61004
Plano-convex
61432
Plano-convex
61432
Plano-convex
61432
Plano-convex
61515
Plano-convex
61515
Plano-convex
ULA
Inch
ULA
LA
LA
ULA
LA
ULA
LA
ULA
LA
LA
LA
LA
ULA
LA
ULA
27
Edge Thickness
CUTTING
HEAD
OPTICS
Optics Type
P/N
Plano-convex
61514
Plano-convex
61514
Plano-convex
61677
Plano-convex
61565
Plano-convex
61565
Plano-convex
61690
Plano-convex
61690
Parts
Plano-Convex
Diameter
Focal Length
Inch
Inch
mm
2.0"
5.18"
0.38"
9.65
LA
2.0"
5.18"
0.38"
9.65
LA
2.0"
10.08"
0.39"
9.90
2.5"
8.75"
0.38"
9.70
2.5"
8.75"
0.38"
9.70
2.5"
10.0"
0.39"
9.90
2.5"
10.0"
0.39"
9.90
LA
ULA
Inch
LA
LA
28
Edge Thickness
CUTTING
HEAD
OPTICS
Parts
Meniscus
Mounted
Diameter
Focal Length
Inch
Inch
mm
1.5"
7.5"
0.29"
7.40
6521606
LA
1.5"
7.5"
0.29"
7.40
Meniscus Mounted
6521607
1.5"
5.0"
0.29"
7.40
Meniscus Mounted
6521608
LA
1.5"
5.0"
0.29"
7.40
Meniscus Mounted
65063
1.5"
5.0"
0.29"
7.30
Meniscus Mounted
6514202
1.5"
7.5"
0.29"
7.40
Meniscus Mounted
6514202
LA
1.5"
7.5"
0.29"
7.40
Meniscus Mounted
6514204
1.5"
5.0"
0.29"
7.40
Meniscus Mounted
6514204
LA
1.5"
5.0"
0.29"
7.40
Meniscus Mounted
6516401
2.0"
5.0"
0.38"
9.60
Meniscus Mounted
6516401
LA
2.0"
5.0"
0.38"
9.60
Meniscus Mounted
6516402
2.0"
7.5"
0.38"
9.60
Meniscus Mounted
6516402
LA
2.0"
7.5"
0.38"
9.60
Meniscus Mounted
6516404
2.0"
10.0"
0.38"
9.60
Meniscus Mounted
6516404
LA
2.0"
10.0"
0.38"
9.60
Meniscus Mounted
6516407
2.0"
10.0"
0.38"
9.60
Meniscus Mounted
6516407
LA
2.0"
10.0"
0.38"
9.60
Meniscus Mounted
680004-002
1.5"
5.0"
0.29"
7.40
Meniscus Mounted
680004-003
LA
1.5"
5.0"
0.29"
7.40
Meniscus Mounted
680003-002
1.5"
7.5"
0.29"
7.40
Meniscus Mounted
680003-004
LA
1.5"
7.5"
0.29"
7.40
P/N
LA
Meniscus Mounted
6521605
Meniscus Mounted
Optics Type
Inch
29
Edge Thickness
CUTTING
HEAD
OPTICS
Parts
Plano-Convex
Mounted
Diameter
Focal Length
Inch
Inch
mm
1.5"
5.0"
0.30"
7.60
6521602
LA
1.5"
5.0"
0.30"
7.60
6521603
1.5"
7.5"
0.31"
8.00
6521604
LA
1.5"
7.5"
0.31"
8.00
65024
1.5"
5.0"
0.30"
7.60
65024
LA
1.5"
5.0"
0.30"
7.60
65025
1.5"
7.5"
0.31"
8.00
65025
LA
1.5"
7.5"
0.31"
8.00
65035
2.0"
5.0"
0.38"
9.60
65035
LA
2.0"
5.0"
0.38"
9.60
65038
2.0"
7.5"
0.38"
9.60
65038
LA
2.0"
7.5"
0.38"
9.60
65045
1.5"
3.75"
0.29"
7.40
65101
1.5"
5.0"
0.30"
7.60
65101
LA
1.5"
5.0"
0.30"
7.60
65102
1.5"
7.5"
0.31"
8.00
65102
LA
1.5"
7.5"
0.31"
8.00
65120
1.5"
5.0"
0.29"
7.40
65120
LA
1.5"
5.0"
0.29"
7.40
65121
1.5"
7.5"
0.29"
7.40
65121
LA
1.5"
7.5"
0.29"
7.40
6514201
1.5"
7.5"
0.29"
7.40
6514201
LA
1.5"
7.5"
0.29"
7.40
6514203
1.5"
5.0"
0.29"
7.40
6514203
LA
1.5"
5.0"
0.29"
7.40
6514205
1.5"
5.0"
0.30"
7.60
Optics Type
P/N LA
6521601
Inch
30
Edge Thickness
CUTTING
HEAD
OPTICS
Plano-Convex
Mounted
Parts
Diameter
Focal Length
Inch
Inch
mm
LA
1.5"
5.0"
0.30"
7.60
6514206
1.5"
7.5"
0.31"
8.00
6514206
LA
1.5"
7.5"
0.31"
8.00
6516403
2.0"
7.5"
0.38"
9.60
6516403
LA
2.0"
7.5"
0.38"
9.60
6516405
2.0"
5.0"
0.38"
9.60
6516405
LA
2.0"
5.0"
0.38"
9.60
6516406
2.0"
7.5"
0.38"
9.60
6516406
LA
2.0"
7.5"
0.38"
9.60
680004-001
1.5"
5.0"
0.31"
7.80
680004-004
LA
1.5"
5.0"
0.31"
7.80
680003-001
1.5"
7.5"
0.31"
7.80
680003-003
LA
1.5"
7.5"
0.31"
7.80
Optics Type
P/N
LA
6514205
Inch
31
Edge Thickness
32
BEAM
DELIVERY
OPTICS
34
BEAM
DELIVERY
OPTICS
Tutorial
In the beam delivery section of a laser working machine, the
laser beam is transferred from the laser cavity to the working
head. In principle, two moveable mirrors would be sufficient
in a 2D-machine for guiding the laser beam to any point on
the worksheet. In modern 2D-machines and especially in 3Dmachines, however, the beam delivery section has additional
functions which require additional mirrors with specific
properties.
In order to optimize function of these mirrors, different
substrate materials are used – the most common ones are
silicon(Si) and copper (Cu). Silicon mirrors have light weight
and are therefore preferred in flying optics where high accelerations are needed. Copper has high thermal conductivity, and channels for cooling water can be included directly
into the mirrors. Therefore, copper mirrors are preferred if
best-possible cooling is important, for example in machines
with very high laser power. – The optical properties of a mirror (reflectance, phase shift, etc) are determined by its coating. So in order to realize different mirror functions, different
coatings are needed.
35
BEAM
DELIVERY
OPTICS
Mirrors
Zero-phase shift mirrors
Windows
In most laser machines, one or several mirrors are used to
Windows for CO2 lasers are used either for protecting sensi-
forward the laser beam from the cavity to the working head.
tive and/or expensive optics, or for separating areas with dif-
Usually, each mirror reflects the laser beam by an angle of
ferent gas pressures. In all applications, high transmittance
90°, corresponding to an angle of incidence of 45°. At these
and low absorption are needed in order to minimize distortion
mirrors, reflectance should be as high as possible in order
of the laser beam. Therefore, such windows usually consist
to minimize losses of laser power; in addition, phase shift
of ZnSe substrates with AR-coatings on both surfaces (same
between the s- and p-polarized components of the reflected
as focusing lenses).
beam should be as low as possible in order to avoid disturbing the polarization of the laser beam. Mirrors with such
properties are called zero-phase-mirrors.
90°- phase shift - mirrors
Most CO2 lasers produce a laser beam which has linear polarization. For cutting metal sheets, however, a beam with circular polarization is needed if the cutting properties have to be
independent of cutting direction. For converting a beam with
linear polarization into a beam with circular polarization, a
90°-phase-retarding mirror (also called lambda/4-mirror) can
be used. This mirror has a special coating which produces
a phase shift of 90° between the s-and p-polarized components of the reflected beam. If the incoming beam has both
components with same intensity and phase (corresponding
to linear polarization), the reflected beam has phase shift of
90° between both components (corresponding to circular polarization).
36
BEAM
DELIVERY
OPTICS
Mirrors
ATFR mirrors
in
In some laser cutting processes, there is considerable
Back reflected
P-Pol
Be
am
risk that some portion of the laser beam is reflected at the
workpiece and returned into the laser cavity. There, it might
Turning mirror
(0° phase shift)
Input S-Pol
disturb laser operation. In order to avoid this problem, a socalled ATFR mirror can be inserted in the beamline. Such a
mirror has high reflectance (typically 99%) for s-polarized
90°-phase-retarder
radiation and low reflectance (typically less than 1%) for p-
Focusing lens
polarized radiation.
workpiece
Telescope mirrors
In many applications, the small diameter of the laser beam
produced in the laser cavity is not convenient because the
beam has high divergence and high power density. In order
to avoid subsequent problems, the beam diameter can be increased by using a telescope consisting of two mirrors – one
with a convex surface and one with a concave surface. Such
telescope mirrors are usually made of copper.
dout
Mirror
concave
Beam out
dout / din = Rcc / Rcx
Beam in
Mirror
concave
din
37
Mirror distance:
0.5.Rcx
BEAM
DELIVERY
OPTICS
General
Specifications
Si, Cu Zero Phase Shift Turning Mirrors
Material
Si, Cu
Surface Quality
20-10 scratch and dig
Thickness Tolerance
±0.25mm
Diameter Tolerance
+0 / -0.12mm
Mechanical Wedge
<3' (arc minutes)
Power
2F @ 0.633µm
Irregularity
1F @ 0.633µm
Phase Shift
0°±2°
Reflection
>99.5%
Absorption <0.5%
AOI
45°
S1 / S2 Radius
Plano
Si, Cu 9O° Phase Shift Mirrors
Material Si, Cu
Surface Quality
Thickness Tolerance
±0.25mm
Diameter Tolerance
+0.0 / -0.12mm
Mechanical Wedge
< 3’ (arc minutes)
Power
2F @ 0.633µm
Irregularity 1F @ 0.633µm
Phase Shift
90°±3°
Reflection
>98.0%
Absorption <1.5%
AOI
45°
S1 / S2 Radius
Plano
For special mirror applications or other coating types please contact your local Ophir agent - www.ophiropt.com
38
BEAM
DELIVERY
OPTICS
General
Specifications
ZnSe windows
Material ZnSe
Surface Quality
Thickness Tolerance
±0.25mm
Diameter Tolerance
+0.0 / -0.12mm
Mechanical Wedge
<3’ (arc minutes)
Power
1F @ 0.633µm
Irregularity
0.5F @ 0.633µm
Reflection
<0.25%
Absorption <0.2%
Transmission
>99.3%
S1 / S2 Radius
Plano
39
BEAM
DELIVERY
OPTICS
General
Specifications
Si, Cu ATFR Mirrors
Material Si, Cu
Surface Quality
Thickness Tolerance
+0.0 / -0.2mm
Diameter Tolerance
+0.0 / -0.12mm
Mechanical Wedge
Power
1F @ 0.633µm
Irregularity 0.5F @ 0.633µm
Reflection Spol AOI 45°
≥90.0%
Reflection Ppol AOI 45° ≤1.5%
S1 / S2 Radius
Plano
Cu Telescope Mirrors
Material
Cu
Surface Quality
Thickness Tolerance
+0.0 / -0.1mm
Diameter Tolerance
+0.0 / -0.1mm
Mechanical Wedge
<3’ (arc minutes)
Power
2F @ 0.633µm
Phase Shift
0°±1°
Reflection
>99.5%
Absorption <0.5%
AOI
45°
40
BEAM
DELIVERY
OPTICS
Optics Type
0° PS
Zero
Phase shift
Parts
Substrate
P/N
Si
630321-117
Inch
1.00"
Diameter
Edge Thickness
mm
Inch
mm
25.4
0.118"
3.00
0° PS
Si
630065-117
1.50"
38.1
0.157"
4.00
0° PS
Si
630787-117
1.75"
44.4
0.375"
9.52
0° PS
Si
630326-117
1.75"
44.4
0.20"
5.08
0° PS
Si
630069-117
2.00"
50.8
0.375"
9.52
0° PS
Si
630714-117
2.00"
50.8
0.20"
5.08
0° PS
Si
630337-117
2.00"
50.8
0.40"
10.16
0° PS
Si
630788-117
3.00"
76.2
0.375"
9.52
0° PS
Si
630390-117
3.00"
76.2
0.25"
6.35
0° PS
Si
62239
2.67"
67.9
0.80"
20.32
0° PS
Cu
630705-117
2.36"
60.0
0.393"
10.00
0° PS
Cu
61050
0.98"
25.0
0.24"
6.00
0° PS
Cu
61051
2.00"
50.8
0.20"
5.08
0° PS
Cu
630704-117
1.97"
50.0
0.393"
10.00
0° PS
Cu
61118
1.49"
38.0
0.24"
6.00
0° PS
Cu
61119
1.49"
38.0
0.31"
8.00
0° PS
Cu
61120
2.00"
50.8
0.375"
9.52
0° PS
Cu
61121
2.36"
60.0
0.393"
10.00
0° PS
Cu
61122
2.95"
75.0
0.59"
15.00
0° PS
Cu
61123
3.00"
76.2
0.25"
6.35
0° PS
Cu
61124
3.00"
76.2
0.50"
12.70
0° PS
Cu
61273
1.97"
50.0
0.393"
10.00
0° PS
Cu
630065-117
1.50"
38.1
0.25"
6.35
0° PS
Cu
61443
1.97"
50.0
0.375"
9.52
0° PS
Cu
61792
1.97"
50.0
0.12"
3.00
0° PS
Cu
61793
1.49"
38.0
0.24"
6.00
0° PS
Cu
61794
2.00"
50.8
2.13"
54.00
0° PS
Cu
61795
2.25"
57.1
0.393"
10.00
0° PS
Cu
61796
1.10"
27.9
0.236"
6.00
0° PS
Cu
61797
1.97"
50.0
0.36"
9.01
41
BEAM
DELIVERY
OPTICS
Optics Type
0° PS
Zero
Phase shift
Parts
Substrate
P/N
Cu
61798
Inch
1.97"
Diameter
Edge Thickness
mm
Inch
mm
50.0
0.20"
5.08
0° PS
Cu
61799
2.36"
60.0
0.24"
6.00
0° PS
Cu
62243
2.25"
57.1
1.25"
31.75
* Coating ZPS (Zero Phase Shift). See coatings reference pages 8-9
42
BEAM
DELIVERY
OPTICS
Optics Type
90° phase shift
Parts
Substrate
P/N
90° PS
Si
630324-117
90° PS
Si
90° PS
Inch
Diameter
Edge Thickness
mm
Inch
mm
1.00"
25.4
0.118"
3.00
630063-117
1.50"
38.1
0.157"
4.00
Si
630784-117
1.75"
44.4
0.375"
9.52
90° PS
Si
630066-117
2.00"
50.8
0.375"
9.52
90° PS
Si
630715-117
2.00"
50.8
0.20"
5.08
90° PS
Si
630338-117
2.00"
50.8
0.40"
10.16
90° PS
Si
630327-117
3.00"
76.2
0.375"
9.52
90° PS
Si
630068-117
3.00"
76.2
0.25"
6.35
90° PS
Si
62238
2.67"
68.0
0.80"
20.32
90° PS
Cu
630781-117
1.97"
50.0
0.393"
10.00
90° PS
Cu
61260
2.00"
50.8
0.20"
5.08
90° PS
Cu
61262
2.95"
75.0
0.59"
15.00
90° PS
Cu
61264
3.00"
76.2
0.50"
12.7
90° PS
Cu
61267
2.00"
50.8
0.375"
9.52
90° PS
Cu
61384
2.36"
60.0
0.393"
10.00
90° PS
Cu
61409
1.50"
38.1
0.30"
7.50
90° PS
Cu
61800
2.00"
50.8
0.40"
10.16
90° PS
Cu
61801
2.25"
57.1
0.393"
10.00
90° PS
Cu
61802
1.50"
38.1
0.25"
6.35
90° PS
Cu
61821
2.95"
74.9
0.50"
12.70
90° PS
Cu
62242
2.25"
57.1
1.25"
31.75
90° PS
Cu
62281
2.00"
50.8
2.13"
54.00
* Coating 90°PS. See coatings reference pages 8-9
43
BEAM
DELIVERY
OPTICS
Optics Type
Parts
Windows
Diameter
Inch
mm
LA
Edge Thickness
Inch
mm
Substrate
P/N
window
ZnSe
61786
1.00"
25.4
0.12"
3.05
window
ZnSe
61787
1.50"
38.1
0.16"
4.06
window
ZnSe
61787
1.50"
38.1
0.16"
4.06
window
ZnSe
61788
2.00"
50.8
0.20"
5.08
window
ZnSe
61789
2.00"
50.8
0.375"
9.52
window
ZnSe
61789
2.00"
50.8
0.375"
9.52
window
ZnSe
62204
1.10"
27.9
0.118"
3.00
window
ZnSe
62292
2.50"
63.5
0.35"
8.89
LA
LA
44
BEAM
DELIVERY
OPTICS
Telescope
Mirrors
Parts
mm
Inch
mm
Surface
Radius
1.97"
50.0
0.375"
9.53
1.737MCC
61812
1.97"
50.0
0.393"
10.00
2.25MCX
Cu
61813
1.97"
50.0
0.393"
10.00
1MCX
Telescope Mirror
Cu
61814
1.97"
50.0
0.393"
10.00
1.68MCC
Telescope Mirror
Cu
61815
1.97"
50.0
0.393"
10.00
2MCX
Telescope Mirror
Cu
61816
1.97"
50.0
0.393"
10.00
3MCC
Telescope Mirror
Cu
61817
1.97"
50.0
0.393"
10.00
3.25MCC
Optics Type
Substrate
P/N
Telescope Mirror
Cu
61443
Telescope Mirror
Cu
Telescope Mirror
Inch
Diameter
45
Edge Thickness
46
CAVITY
OPTICS
48
CAVITY
OPTICS
Tutorial
Output coupler and End mirror
In the cavity of a CO2 laser, CO2 molecules are excited by a
gas discharge. This excitation energy is fed into a laser beam
if it has sufficient intensity. For building up this intensity, mirrors are placed at both ends of the discharge such that the
laser beam is reflected back and forth many times. Such an
arrangement is called a laser cavity.
The output coupler usually has reflectance in the range 40%
to 70%. In order to optimize power and spatial profile of the
laser beam, the output coupler and rear mirror have optical
surfaces with well-defined radii of curvature. As the output
coupler transmits a high-power laser beam, it is made of ZnSe
in order to minimize absorption and thermal lensing. The rear
mirror usually has reflectance 99.5% which means that the
transmitted laser beam has low power. However, as absorption in the coating is higher than in the output coupler, it is
more important to use a substrate material with high thermal
conductivity. Therefore, Germanium or Gallium Arsenide are
used in most lasers.
In real cavities, both mirrors have some transmittance: one of
them is the output coupler where the transmitted beam constitutes the useable laser beam; the other one is the rear mirror where the transmitted beam has very low intensity and is
used for controlling purposes. - For building up a laser cavity
with output laser power of several kW, the total length of the
discharge needs to be several meters. Covering this distance
with one discharge is very problematic. Therefore, it is split
up into several discharges working in line. In order to make
the mechanical setup as compact as possible, the path of the
laser beam within the laser cavity is “folded” several times
by using suitable mirrors which are called total reflectors.
Total Reflectors
Total Reflectors are quite similar to turning mirrors. However,
durability of the coating is more critical because the total reflectors are exposed to the gas discharge and the extremely
high laser power density inside the cavity. Therefore, the
coating must have best-possible environmental resistance
and low absorption in order to minimize thermal distortion.
49
CAVITY
OPTICS
General
Specifications
End Mirrrors
Material GE
Surface Quality
Thickness Tolerance
+0mm / -0.1mm
Diameter Tolerance
+0mm / -0.1mm
Mechanical Wedge
Power
2F @ 0.633µm
Reflection
99% / 99.5% / 99.7%
Absorption ≤0.1%
AOI
0°
Side 2 Reflectivity
≤0.2%
Clear Aperture
90%
Si, Cu Total Reflectors
Material Si, Cu
Surface Quality
Thickness Tolerance
+0.0 / -0.2mm
Diameter Tolerance
+0.0 / -0.1mm
Mechanical Wedge
<3’ (arc minutes)
Power
1F @ 0.633µm
Reflection Spol @10.6µm
99.9%
Absorption 0.1%
AOI
45°
50
CAVITY
OPTICS
General
Specifications
Output Couplers
Material ZnSe
Surface Quality
Thickness Tolerance
±0.2mm
Diameter Tolerance
+0 / -0.1mm
Mechanical Wedge
<3’ (arc minutes)
Power
1F @ 0.633µm
S1 Reflection @ 10.6µm
30% to 70%
S1 Reflection Tolerance ±0.2%
S2 Reflection @ 10.6µm ≤0.2%
51
CAVITY
OPTICS
Parts
End Mirrors
Inch
mm
Reflection
S1
25.4
0.240"
6.00
99.6%
15MCC
Plano
1.10"
27.9
0.240"
6.00
99.6%
30MCC
Plano
61406
1.10"
27.9
0.220"
5.59
99.6%
10MCC
Plano
Ge
61407
1.10"
27.9
0.220"
5.59
99.6%
20MCC
Plano
End Mirror
Ge
61436
1.00"
25.4
0.240"
6.00
99.5%
15MCC
Plano
End Mirror
Ge
61543
1.50"
38.1
0.310"
8.00
99.5%
15MCC
Plano
End Mirror
Ge
61544
1.50"
38.1
0.310"
8.00
99.5%
35MCC
Plano
End Mirror
Ge
61547
1.10"
27.9
0.240"
6.00
99.5%
20MCC
Plano
End Mirror
Ge
61993
1.10"
27.9
0.220"
5.59
99.5%
10MCC
0.602MCX
Optics Type
Substrate
P/N
End Mirror
Ge
End Mirror
Diameter
Inch
mm
61382
1.00"
Ge
61383
End Mirror
Ge
End Mirror
52
Edge Thickness
Surface Radius
S1
S2
CAVITY
OPTICS
Parts
Optics Type
Substrate
P/N
Total Reflector
Si
630785-117
Total Reflector
Si
Total Reflector
Inch
Total
Reflectors
Diameter
Edge Thickness
mm
Inch
mm
1.00"
25.4
0.118"
3.00
62391
1.50"
38.1
0.375"
9.52
Si
630786-117
1.75"
44.4
0.375"
9.52
Total Reflector
Si
630780-117
2.00"
50.8
0.200"
5.08
Total Reflector
Si
630330-117
2.00"
50.8
0.375"
9.52
Total Reflector
Si
630331-117
3.00"
76.2
0.375"
9.52
Total Reflector
Si
630067-117
3.00"
76.2
0.25"
6.35
Total Reflector
Cu
61817
1.97"
50.0
0.393"
10.00
Total Reflector
Cu
630783-117
1.97"
50.0
0.393"
10.00
Total Reflector
Cu
630328-117
2.00"
50.8
0.375"
9.52
Total Reflector
Cu
630703-117
2.00"
50.8
0.200"
5.08
Total Reflector
Cu
630782-117
2.36"
60.0
0.393"
10.00
Total Reflector
Cu
61809
3.00"
76.2
0.500"
12.70
Total Reflector
Cu
61277
3.00"
76.2
0.500"
12.70
• AOI is 45°
• Reflection >99.7%
• Coatings: MMR, MMR-A, MMR-H, MMR-P. See coatings reference pages 8-9
53
CAVITY
OPTICS
Parts
Output
Couplers
Inch
mm
Reflection
S1
Absorption
44.4
0.250"
6.35
35%
<0.10%
20MCC
10MCX
1.50"
38.1
0.315"
8.00
40%
<0.13%
15MCC
7.5MCX
61663
1.50"
38.1
0.236"
6.00
40%
<0.09%
15MCC
10MCX
ZnSe
61883
1.50"
38.1
0.315"
8.00
40%
<0.13%
40MCC
20MCX
Output Coupler
ZnSe
61887
1.50"
38.1
0.315"
8.00
40%
<0.13%
50MCC
25MCX
Output Coupler
ZnSe
61381
1.10"
27.9
0.236"
6.00
50%
<0.05%
30MCC
30MCX
Output Coupler
ZnSe
61410
1.10"
27.9
0.220"
5.58
50%
<0.05%
20MCC
15MCX
Output Coupler
ZnSe
61643
1.18"
29.9
0.236"
6.00
50%
<0.10%
10MCC
10MCX
Output Coupler
ZnSe
61884
1.50"
38.1
0.315"
8.00
50%
<0.13%
40MCC
20MCX
Output Coupler
ZnSe
61888
1.50"
38.1
0.315"
8.00
50%
<0.13%
50MCC
25MCX
Output Coupler
ZnSe
63003
1.10"
27.9
0.236"
6.00
50%
<0.06%
20.065MCC
12MCX
Output Coupler
ZnSe
61545
1.50"
38.1
0.315"
8.00
60%
<0.13%
35MCC
15MCX
Output Coupler
ZnSe
61994
1.10"
27.9
0.220"
5.58
60%
<0.08%
10MCC
5MCX
Output Coupler
ZnSe
61435
1.00"
25.4
0.236"
6.00
65%
<0.08%
30MCC
30MCX
Output Coupler
ZnSe
61835
1.00"
25.4
0.236"
6.00
65%
<0.10%
30MCC
30MCX
Output Coupler
ZnSe
61411
1.10"
27.9
0.220"
5.58
70%
<0.05%
20MCC
20MCX
Output Coupler
ZnSe
61546
1.10"
27.9
0.236"
6.00
70%
<0.12%
Plano
Plano
Optics Type
Substrate
P/N
Output Coupler
ZnSe
Output Coupler
Diameter
Inch
mm
62056
1.75"
ZnSe
61542
Output Coupler
ZnSe
Output Coupler
Edge Thickness
54
Surface Radius
S1
S2
MAINTENANCE
55
56
MAINTENANCE
Protecting your optic investment, and your
laser’s productivity
to see it, you can smell the difference. A clean lens will have no
odor while a contaminated lens may take on an odor described as
rotten eggs with the intensity depending upon the level of contamination. By Todd Jacobson,
Technical Consultant, Laser Maintenance Group
Contamination (regardless of the type) will cause thermal lensing.
This is a condition where the lens starts absorbing more of the precious power we pay extra for when buying our laser systems. The
result is a focal point that drifts due to the temperature dependent
index of refraction, ultimately causing dross on our parts. In response to a poor cut, the operator will adjust cutting parameters, in
a futile effort to correct the problem. Unfortunately, he will continue
to adjust, trying to compensate for a forever-changing focal point all
the while getting further and further away from good parameters. Your operator will eventually be frustrated, the manufacture gets
sub standard parts and, or extra labor costs to correct the parts.
While struggling to get acceptable parts, production levels are reduced and good cutting parameters lost. Once the operator cleans
or replaces the lens the suffering is only half over. Now the operator will have to adjust parameters settings in order to get them back
to their original position, continuing the painful time lost to reduced
production.
Reflecting back to 1989 when I entered into this career eager to apply my degree in Laser Technology, mainstream fabrication lasers
were typical low powered 800 and 1200 watts. With today’s lasers
now at 5000 and 6000 watts, I find there are still common areas of
maintenance and problems between them. However, some of these
issues are exponentially magnified with the higher wattage.
We will cover routine maintenance items that the majority of operators or maintenance personal can comfortably handle. However,
until you have been properly trained, or even when in doubt you
should always have a trained technician complete or assist you
with the tasks.
We will start this issue with a topic that is commonly over looked,
and explain the pros and cons of your decisions in handling this.
The Focusing lens, we all have them, but do we take care of them
as we should?
Let’s start with the pros: One school of thought states, “Only clean
your optic when you can see that it’s dirty.” doing so will minimize
the chance of scratching the thin coating of thorium fluoride applied
to the surface. Scratches will increase light absorption and scatter. Additionally, cleaning optics takes valuable time away from the
production schedule. If the lens is ignored long enough the optic will stress and end in a
catastrophic failure. You can use a Polarized Stress tester to check
for damage. Typical cutting lens are made of Zinc Selenide (ZnSe). The unstressed crystal structure in a lens contains dipole moments
whose sum at their vertex is equal to zero. In the stressed crystal, there are domains where the sum of the dipole moments are
not zero and therefore are polarized. When viewed with a polarizer
stress tester, these domains will look like shadow lines or darkened
regions. The polarizer is setting up diffraction patterns for your eye
to see.
On the opposing side, failing to periodically inspect the lens could
have a multitude of unwanted and potentially costly results. Two
conditions can exist; a visibly dirty lens, or a lens with a hydrocarbon film not seen by the naked eye. Although you might not be able
Cleaning
and
Handling
57
MAINTENANCE
Cleaning
and
Handling
To detect stress regions in the lens, place the lens between the polarized stress tester and hold in front of a good light source then
slowly rotate the assembly 360 degrees looking for dark regions or
distinct patterns. Catastrophic failure will turn the ZnSe lens into a dangerous yellow
powder. This powder is a serious health hazard requiring immediate
evacuation of the area. Please refer to optic manufactures such as
Ophir Optic’s MSDS for a complete report. Besides the health issue,
your system will require extended down time and costly repair to
thoroughly clean the debris from your beam delivery guide and undoubtedly replace burned components in the cutting head.
Good Mode Quality, It’s Not Rocket Science
One of the biggest factors in determining your lens inspection interval is the type of materials you process. This interval should be
frequent enough to provide a consistent process therefore reducing
your hourly costs. Lens inspection should be one of the first things
your operator checks when there are problems with the cut quality. It’s time well spent considering the consequences if you do not.
Before we start discussing mode quality we should explain what
we mean by “mode.” The term mode as it applies to lasers is short
for Transverse Electromagnetic Mode. Light traveling through free
space will make a TEM mode since it has no electric or magnetic
field in the direction of propagation. It’s used to basically describe
the shape of your laser beam. Lower order modes work best for
laser cutting applications since they tend to focus better. This is
due to the fact they have less complexity or fewer points to focus
than do the higher order modes. The lowest order mode or TEM00
is called a Gaussian mode. It’s from here that the other modes will
build from.
By Scott Kiser,
Technical Consultant, Laser Maintenance Group
It doesn’t matter how good your operators and maintenance staff
are. It doesn’t matter how new or powerful your laser center is. It
doesn’t matter that you use the best consumables, or have the best
programming software. Sound true? Of course not, except in one
case. If your resonator’s mode quality is poor none of the above
will get you to cut good parts on your laser center. Well then what
determines if your mode is good or bad?
Mode quality is defined differently by almost every laser OEM. They
each have their own ways to determine what a good mode is. Most
will place a block of acrylic a specified distance from the resonator
and fire the raw beam into the block for a set period of time. Others
will use thermal blocks to observe the shape of the beam. Still yet a
few others tune for peak power and graph out all sorts of mirror combinations. In any case measurements are taken, calculations made,
tolerances are taken into account and a decision is made whether
it’s good or not. Every time I tune a mode, I am reminded of a quote
58
MAINTENANCE
Cleaning
and
Handling
from an optical engineer at one of the biggest laser manufacturers.
I was a brand new service tech, and the mode we shot was a TEM10.
No matter what I did I could not get a TEM 01* like I was trained for. I
called for help, and after much abuse I was informed that, “All that
matters is symmetry! It’s not rocket science you know!” Turned out
he was right. When I finished, the laser center cut parts at the rated
feed rates and with superb edge quality.
Anytime you change optics in your resonator your mode will have
to be re-evaluated, and most likely corrected. Start off by using only
high quality optics. Refurbs, reconditioned, or low quality optics
will result in disappointing or short lived mode quality. When you’re
done tuning make sure your mode is symmetrical. If it leans, has
interference rings, or any asymmetry, fix it now before you move
on. Symmetry is critical since once the lens focuses the beam it
needs to consistently present itself to the material no matter which
direction you are cutting. If your mode leans it will cut well in one direction, and poorly in another. No amount of focusing or parameter
adjustments will solve this problem.
Settling for a marginal mode will result in wasted time. Part quality
and production will suffer until it is done correctly. Next time you
have your service tech adjust the mode, go stand with him and look
at it together. Just like any other aspect of the laser maintenance,
quality is paramount. Make sure your mode is good. Remember
‘symmetry’ and you will be fine.
Here are a few of the calculations the physicists use to measure
and predict the different orders of modes in cylindrical cavities: I’m
starting to now wonder if it’s not “Rocket Science” it must be close.
I’m just glad tuning a good mode is not.
Before I wrote this article I reviewed some of the information on
modes in an effort to be technically accurate, and to explain it in
terms the rest of us normal people use.
59
MAINTENANCE
Cleaning
and
Handling
Methods for
CO2 Optics
General Precautions
1. Coated surfaces should never be touched. Always hold
the optic element by its sides.
2. Always wear powder-free finger cots or latex gloves
when handling the optics. Bare hands might leave oils
and dirt, which will damage their performance.
3. Do not use any tools or sharp objects when handling the
optic element or when removing it from its packaging.
4. Prepare a clean and smooth work surface that is free of
oils, grease, dirt, etc.
5. Optic elements will easily scratch when placed on hard
surfaces. Once the optic is unpacked, carefully place it
on the lens tissue into which it was originally wrapped.
Then place the tissue and the lens on a soft cloth or on the
foam in the package.
The optic elements were cleaned and packaged in a
clean and controlled environment at Ophir and should
be ready to install in the laser machine. If an unpacked
new optic element does not appear to be clean or seems
to have a defect, please contact your local Ophir agent.
Method A:
Condition of lens: Dust or small loose particles on the surface
Cleaning method:
1. Use a small air bulb to gently blow off dust and debris. Do
not use compressed air from a compressor as it is not a
“clean” source of air and can contaminate the surface.
2. Gently place the provided optical-grade rice paper on the
optic element. Slightly wet the paper with drops of Propanol/Ethanol (CP grade), using a pipette, and gently pull the
paper toward the dry side away from the element, until
there is no contact between them.
The following cleaning methods are for all optic elements
The Black MagicTM DuralensTM should be treated with the
same care and by the same methods as the standard AR
coated CO2 Optics.
If this method is not successful, proceed to Method B
60
MAINTENANCE
Method B:
Condition of lens: Fingerprints, oil, other visual contaminants
Methods for
CO2 Optics
Method C:
Aggressive Cleaning
Attention: This method is to be used only after trying methods
A and B.
In the event that you have completed steps A and B and the
optic element is still contaminated please contact your local
Ophir Dealer for further instructions.
Cleaning method:
1. Use a new clean cotton ball or cotton swab.
2. Dampen cotton with Propanol/Ethanol (CP grade). The
cotton must not be dry.
3. Slowly and gently wipe the element in a regular pattern.
Do Not scrub the surface (scrubbing might damage the
coating or the element itself). Gently wipe element in “S”
motion.
4. If the surface is left with wipe marks, wipe it at a slower
rate. When finished no streaks should be visible.
Condition of lens: Deteriorated performance and severe
signs of contamination.
The aggressive cleaning will usually be needed due to heavy
usage of the lens. However, certain types of contamination
can not be removed and require replacing the optic element.
Method B (II):
Condition of lens: Moderate contamination (spittle, oils)
Cleaning method:
This method might erode the surface of the optics. If a change
of surface color is noticeable stop polishing immediately.
2. Dampen cotton with polishing compound (about 5
drops).
3. Gently and briefly wipe optics in “S” motion. Avoid pressing down the cotton or scrubbing the surface.
4. Wet a new cotton ball or swab with Propanol/Ethanol.
Gently but thoroughly swab the surface (do not allow it to
dry).
5. Examine the surface under light in front of black background. Remove remaining residue by repeating step 4
until surface is clean.
Cleaning method:
2. Dampen cotton with acetic acid (or vinegar) with 6%
acidity. The cotton must not be dry.
3. Slowly and gently wipe the element in a regular pattern.
Do Not scrub the surface (scrubbing might damage the
coating or the element itself). Gently wipe element in “S”
motion.
4. If the surface is left with wipe marks, wipe it at a slower
rate. When finished no streaks should be visible.
5. Slightly wet the provided optical-grade rice paper with
drops of Propanol/Ethanol (CP grade), using a pipette and
gently pull the paper toward the dry side away from the
element, until there is no contact between them, until the
residue of acetic acid has been removed.
Cleaning
and
Handling
61
MAINTENANCE
Cleaning Kit
This Cleaning Kit Includes:
EZ Cleaning Kit is designed to prolong the life of CO2 laser
optics used in harsh industrial environments.
•
•
•
•
•
•
Ophir’s EZ Kit for cleaning CO2 laser optics was developed
specifically for High Power CO2 Lasers. Cleaning can help
prevent damage to the coatings and substrate to prolong the
lens’ life.
Providing complete, step by step cleaning instructions, the
EZ Cleaning Kit for High Power CO2 Laser Optics includes
Air bulb
Polishing compound (Alumina Oxid Polish)
Dispensers for Propanol and cleaning fluid
Finger cots
Cotton balls
Lens tissue (optical grade rice paper)
premeasured dispensers for: Alcohol, vinegar and polishing formula for hard to remove spatters and contaminations,
as well as lens paper, cotton swabs and finger cots for safe
handling.
62
MAINTENANCE
Ophir Optronics’ CO2 Optics Group Introduces
EZ-CleanTM, The First Disposable Wipes for
Laser Optics
Ophir offers cleaning holders, the EZ way to clean your optics
without touching its surfaces. Simply place the optic on one
holder, clean the first surface, then place the second holder
on top, turn it all upside-down and clean the
second surface.
EZ-CleanTM, an innovative disposable wipe for the routine
cleaning of optical High power CO2 laser lenses. The result of
many months of research and testing, EZ-CleanTM has been
developed specifically for CO2 laser optics. Composed of special non-scratch fabric, the wipe deposits a pre-measured
amount of quick-drying cleaning fluid that leaves no residue.
The EZ-CleanTM package comes with 24 ready-to-use wipes,
in which one wipe cleans one lens in a matter of seconds.
EZ CleanTM Wipes for
Lens Cleaning
and
Cleaning
Holder
63
MAINTENANCE
EZ CleanTM Lens Cleaning
Instructions
Step 1:
Separate one wipe
Step 2:
Take out the folded wipe
Step 3:
Using an "S" motion, wipe from top to bottom
Step 4:
Turn the lens upside down
Step 5:
Turn the wipe to the other side
Step 6:
Using an "S" motion, wipe from top to bottom
warning: cleaning liquid
is flammable;
keep package away from hot
surfaces
Step 7:
Properly dispose the wipe and package
64
MAINTENANCE
CW power: Comet 10K-HD - 200W to 10KW
Ophir now offers the Comet laser power probe series that
is simple to use, economical but also highly accurate.
It operates by measuring the heat rise from a 10 second
exposure to a laser beam and thereby calculates the laser power. It has a sophisticated algorithm to take into
account the heat loss due to the Comet temperature and
thus can give accurate readings even if the Comet is hot
before the measurement. This allows you to take several measurements before cooling the probe with water.
Recommended Use: Industrial Lasers.
Special Features: Accurate, simple to use and inexpensive
65
Comet
MAINTENANCE
Model
Comet 10K HD
Power measurement range
200W to 10,000W
Spectral range
CO2
Absolute calibration accuracy at calibrated wavelengths
±5%
Repeatability
±1% for same initial temperature
Linearity with power
±2 % from 1KW to 10KW
Number of readings before probe must be cooled (for 25°C 1KW
starting temp.)
3KW
4KW
10KW
Comet
4
3
2
1
Absorber: ∅110mm dia x 87mm thick. Max beam size 55mm. Length: 350mm
Dimensions
Damage threshold for Power
power
1 KW
2 KW
3 KW
5 KW
10KW
Beam dia <40mm
10KW/cm2
10KW/cm2
8KW/cm2
6KW/cm2
4KW/cm2
Damage threshold for Energy
Pulse width
<100ns
10µs
1ms
10ms
1J/cm2
3J/cm2
30J/cm2
150J/cm2
Beam dia <40mm
7KW/cm2
6KW/cm2
5KW/cm2
3KW/cm2
2KW/cm2
Time to reading
Initial reading approximately 20s after exposure, final reading 70s
Weight
1.2Kg
Temperature compensation
Temperature compensated to give accurate readings independent of starting probe temperature
Maximum permitted probe temperature
70°C before measurement, 140°C after measurement
Swivel mount
Fixed position
Display
2x8 character LCD. Character height 5mm
Operation modes:
AUTO: Automatic measurement with laser set to 10s timed exposure. Unit senses temperature rise and measures
automatically.
MANUAL: User places probe in front of beam for 10s. Unit beeps to indicate start and stop measurement points. AUTO:
Automatic measurement with laser set to 10s timed exposure. Unit senses temperature rise and measures automatically.
MANUAL: User places probe in front of beam for 10s. Unit beeps to indicate start and stop measurement points.
History
Stores last three readings
Calibration
Can be recalibrated by user
Battery
2 x AA. Lifetime in normal use approximately 1 year.
Electromagnetic compatibility
CE approved
Ordering Information
Item
Description
Ophir P/N
Comet 10K HD V2
Hand held power probe for 200 – 10,000W with conical absorber for high damage threshold
1Z02706
66
JAPAN
Ophir Japan Ltd. - OJ
3-43 Kishiki-cho, Omiya-Ku
Saitama-shi, Saitama, 330-0843
Japan
Tel.
81-48-646-4150
Fax.
81-48-646-4155
www.ophirjapan.co.jp
CO2
OPTICS
CATALOG
International Headquarters
U.S.A.
Ophir Optronics Ltd.,
Science Based Industrial Park,
P.O.B. 45021, Jerusalem 91450
Israel
Tel. 972-2-5484444
Fax. 972-2-5822338
www.ophiropt.com
Ophir Optics Inc. - OPI
1600 Osgood Street
North Andover, MA 01845
USA
Tel. 800-820-0814
Fax. 978-657-6056
www.ophiropt.com
CO2 Optics Catalog 2009 - 2010
GERMANY
Ophir Optronics GmbH - OPG
Alter Kirchweg 1 31627 Rohrsen
Germany
Tel.
49-5024-9818-0
Fax.
49-5024-9818-18
www.ophiropt.de
A Cut Above The Rest

co2 optics catalog

Transcription

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