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Pulse and spectrum measurements at different positions
(0)
BS1
Amplifier
(1)
P
BS2
(2)
Periscope
S
(3)
(4)
CX:2000mm
Mirror
Mirror
(5)
Pulse energy was
measured at
position 5
Wedge 2
(6)
Wedge 1
Dazzler setting
Second order: -17635 fs^2
Third order: 2004 fs^3
Which gives a shortest pulse
duration measured at position 6
Wednesday, June 12, 2013
S
AC
Spectrum
1.0
108 uJ
I�Λ� �a.u.�
0.8
Transform-limited:
40.8 fs
0.6
0.4
0.2
0.0
740
760
1.0
780
800
820
wavelength �nm�
Spectrum
840
860
198 uJ
I�Λ� �a.u.�
0.8
Transform-limited:
39.1 fs
0.6
0.4
0.2
0.0
740
760
1.0
780
800
820
wavelength �nm�
Spectrum
840
860
315 uJ
I�Λ� �a.u.�
0.8
Transform-limited:
33.9 fs
0.6
0.4
0.2
0.0
740
760
1.0
780
800
820
wavelength �nm�
Spectrum
840
860
505 uJ
I�Λ� �a.u.�
0.8
Transform-limited:
28.8 fs
0.6
0.4
0.2
0.0
740
760
1.0
780
800
820
wavelength
�nm�
Spectrum
840
860
865 uJ
I�Λ� �a.u.�
0.8
Transform-limited:
28.7 fs
0.6
0.4
0.2
0.0
740
Wednesday, June 12, 2013
760
780
800
820
wavelength �nm�
840
860
Conclusions
•
Spectrum is broadened at high energy because of nonlinear
processes such as SPM
•
The broadened spectrum will be hard to be compensated by
manually changing dazzler settings to get transform-limited pulse.
•
Problem: AC trace is broadened only at center, which increases
the pulse duration significantly
Wednesday, June 12, 2013
Effect of rotating polarization on AC trace
At a low energy
(0)
BS1
At a high energy
After rotating polarization
Amplifier
(1)
P
BS2
(2)
Periscope
S
(3)
(4)
CX:2000mm
Mirror
Mirror
(5)
Wedge 2
(6)
Wedge 1
WP
S
AC
Wednesday, June 12, 2013
Optimization of TP
(0)
BS1
Amplifier
(1)
BS2
P
(2)
(3)
CX:2000mm
TP
Wednesday, June 12, 2013
Periscope
S
(4)
(5)
56 degree
Mirror
AC appears only when rotating waveplate to get P polarization
(0)
BS1
Amplifier
(1)
P
BS2
(2)
Periscope
(3)
(4)
S
CX:2000mm
Mirror
Mirror
(5)
Wedge 2
(6)
Wedge 1
S
P
Waveplate
AC
Not flipped
Wednesday, June 12, 2013
AC appears only when rotating waveplate to get P polarization
(0)
BS1
Amplifier
(1)
P
BS2
(2)
Periscope
(3)
CX:2000mm
Not flipped
S
(4)
AC
WP
Mirror
Mirror
Wednesday, June 12, 2013
Wedge
At low energy
(0)
BS1
Amplifier
(1)
P
BS2
(2)
Periscope
(3)
S
CX:2000mm
(4)
AC
Not flipped
At high energy
Mirror
Mirror
Wednesday, June 12, 2013
Wedge
At low energy
(0)
BS1
Amplifier
(1)
P
BS2
(2)
Periscope
(3)
CX:2000mm
S
(4)
AC
Not flipped
At high energy
Mirror
Mirror
Wednesday, June 12, 2013
Wedge
At low energy
(0)
BS1
Amplifier
(1)
P
BS2
At high energy
(2)
Periscope
(3)
AC
CX:2000mm
S
(4)
Not flipped
Mirror
Mirror
Wednesday, June 12, 2013
Wedge
AC
(0)
BS1
Amplifier
(1)
P
BS2
(2)
Periscope
(3)
CX:2000mm
S
(4)
Not flipped
Mirror
Mirror
Wednesday, June 12, 2013
Wedge