Page 291 - High Power Laser Handbook

260 So l i d - S t at e La s e r s Thin-Disc Lasers 261

360 P pump = 40 W
P pump = 50 W
320
P pump = 60 W
280 P pump = 70 W
Pulse energy (µJ) 200 Bifurcation limit
P pump = 80 W
240

160
120
80
40
0
40 50 60 70 80 90 100
Amplifier round trips
Figure 10.29 Pulse energy of the amplified pulses, 50 kHz repetition rate.
(Courtesy of Dausinger und Giesen Gmbh)

1.0
P pump = 40 W, Q = 50 µJ
62 mm, τ ACF = 488 fs
0.8 P pump = 60 W, Q = 200 µJ
Autocorrelation signal 0.6 P pump = 80 W, Q = 315 µJ
33 mm, τ ACF = 283 fs

23 mm, τ ACF = 190 fs
0.4

0.2

0.0

−1500 −1000 −500 0 500 1000 1500 2000
Delay (fs)
Figure 10.30 Autocorrelation trace of the amplified pulses at a repetition
rate of 50 kHz with optimized adjustment of compressor gratings.
(Courtesy of Dausinger und Giesen Gmbh)

Further scaling of the pulse energy is possible by combining
regenerative amplifiers with geometrical multipass amplifiers. Such
a multipass concept was developed to realize a system which is able
to deliver pulses “on demand” with a very short reaction time.
Starting with a specially designed q-switch thin-disc laser, it uses a