“Osciladores láser de femtosegundos a 2 µm”

ULTRAFAST LASERS
AVANCES EN I+D Y APLICACIONES INDUSTRIALES
“Osciladores láser de femtosegundos a 2 µm”
ULTRAFAST LASERS
AVANCES EN I+D Y APLICACIONES INDUSTRIALES
¿Quienes somos?
Grupo de investigación en Tarragona, URV
¿Qué sabemos hacer?
Obtención de materiales láser y de óptica no lineal – Cristales
Caracterización de estos materiales – muchas propiedades
físicas y químicas (ópticas, térmicas, etc…).
Montaje de osciladores láser en el IR (1, 1.5, 1.9 y 2.1 µm) en
diferentes regímenes temporales, CW, Q-switching (ns), Modelocking (ps y fs) pasivos.
ULTRAFAST LASERS
AVANCES EN I+D Y APLICACIONES INDUSTRIALES
EMISIÓN
Tm:KLu(WO4)2
ABSORCIÓN
E//Ng red
E//Nm blue
E//Np black
σa [10-20 cm2]
10
8
6
σa, σe [10-20 cm2]
Tm
3
2
1
0
1600
1800
2000
4
Ho
2
0
760
780 800 820
wavelenght [nm]
840
σ
1,5
σa,σe [10-20 cm2]
Tm,Ho:KLu(WO4)2
σa
σe
4
a
σ
e
1,0
0,5
0,0
1800
1900
2000
2100
wavelength [nm]
2200
ULTRAFAST LASERS
AVANCES EN I+D Y APLICACIONES INDUSTRIALES
CW
1.0
Mode-Locked
Normalized intensity
80
60
ηML = 9.6 %
40
20
0
0.0
measured
fit ML
0.2
0.4
0.6
0.8
1.0
τ∆ν = 0.6
f = 89 MHz
Toc = 1.5%
3.2 ps x 1.54
2010 2020
0.5
Wavelength (nm)
0.0
-12
(b)
-8
-4
0
4
8
12
16
Time delay (ps)
Abstract: Tunable and mode-locked laser operation of different - 4at.% and
10at.% - Tm-doped YAG ceramics is demonstrated. Various designs of
quaternary InGaAsSb surface-quantum-well SESAMs are characterized and
studied as saturable absorbers for mode-locking. Best pulse performance was
achieved using an antireflection-coated near-surface quantum-well (5 nm below
cap) SESAMs with 3 ps pulse duration and 150 mW average output power at
89 MHz. All mode-locked Tm:YAG ceramic laser operated at 2012 nm, whereas
a continuous-wave tuning of 133 nm was achieved.
20
ULTRAFAST LASERS
AVANCES EN I+D Y APLICACIONES INDUSTRIALES
GRAFENO
SWCNTs
SESAMs
En construcción
ULTRAFAST LASERS
1.0
Norm. Int. [a.u.]
Normalized Intensity [a.u.]
AVANCES EN I+D Y APLICACIONES INDUSTRIALES
τp=2.8 ps
0.8
0.6
1.0
∆λ=1.6 nm
(FWHM)
0.5
0.0
2.055
2.060
2.065
Wavelength [µm]
0.4
FWHM=4.3 ps
0.2
0.0
-10
-5
0
5
10
Delay [ps]
15
20
Abstract: We demonstrate passive modelocking of a Tm,Ho-codoped crystalline laser
operating on the Ho3+-ion transition
5I7→5I8 near 2 µm using a single-walled
carbon nanotube saturable absorber. The
Tm,Ho:KLu(WO4)2 laser emits nearly
transform-limited pulses with duration of 2.8
ps at a repetition rate of 91 MHz. The output
power amounts to 97 mW.
ULTRAFAST LASERS
AVANCES EN I+D Y APLICACIONES INDUSTRIALES
Abstract: Mode-locked laser operation
based on single-walled carbon nanotube
saturable absorbers is demonstrated in the
2 µm spectral range using Tm-doped
KLu(WO4)2 as active laser medium. The
mode-locked laser delivers pulses as short
as 141 fs at a center wavelength of
2037 nm. The oscillator operating at a
repetition rate of 88 MHz delivers 26 mW
average output power.
ULTRAFAST LASERS
AVANCES EN I+D Y APLICACIONES INDUSTRIALES
Abstract: Large-area monolayer graphene, synthesized by chemical vapor
deposition, was transferred to a 1-in. quartz substrate. The high-quality
monolayer graphene has been subject to characterization of the nonlinear
properties near 1 µm and was successfully applied as saturable absorber for
passive mode-locking of a femtosecond Yb:KLuW laser. The diode-pumped
mode-locked Yb:KLuW laser was tunable around 1.04 lm and delivered pulses
as short as 160 fs. The maximum output power of 160 mW was demonstrated
for 203 fs pulse duration.
ULTRAFAST LASERS
AVANCES EN I+D Y APLICACIONES INDUSTRIALES
Contacto: [email protected]