Multi-mJ, 200-fs, cw-pumped, cryogenically cooled, Yb,Na:CaF2 amplifier.
Using a novel (to our knowledge) broadband Yb-doped Yb3+,Na+:CaF2 crystal cooled in a closed loop to 130 K we demonstrate a chirped pulse regenerative laser amplifier delivering the energy of up to 3 mJ at a repetition rate of 1 kHz and an average output power of 6 W at 20 kHz. The gain narrowing in the laser crystal is compensated by shaping the amplitude of the seed pulse spectrum. As the result, at the highest amplified pulse energy we obtain a 12 nm FWHM bandwidth supporting a 130 fs pulse duration, assuming ideal compression. Amplified pulses were recompressed from 250 ps to 195 fs with a 1700 lines/mm transmission grating compressor.
Pugzlys
A
A
Photonics Institute, Vienna University of Technology, Vienna, Austria. pugzlys@tuwien.ac.at
Andriukaitis
G
G
Baltuska
A
A
Su
L
L
Xu
J
J
Li
H
H
Li
R
R
Lai
W J
WJ
Phua
P B
PB
Marcinkevicius
A
A
Fermann
M E
ME
Giniūnas
L
L
Danielius
R
R
Alisauskas
S
S