Picosecond Nd:YLF Five-Passes Laser Amplifier
with 20 mJ Pulse Energy¹

Q. K. Ai^a, *, M. Chen^a, **, Y. Xu^a, L. Chang^a, L. Y. Chen^a,
G. Li^a, J. H. Yang^b, and Y. F. Ma^b

^a Institute of Laser Engineering, Beijing University of Technology, Beijing 100124, China

^b Beijing GK Laser Technology Co., Ltd, Beijing 100085, China

*e-mail: ai.qingkang@gmail.com

**e-mail: chenmeng@bjut.edu.cn

December 27, 2011; in final form, December 30, 2011; published online June 12, 2012

Abstract—We have demonstrated an all-diode-pumped Nd:YLF laser amplifier that produces 20.8 mJ pulses
of 12.9 ps duration at 10 Hz repetition rate. The laser system consists of a mode-locking oscillator, a regenera-
tive amplifier and a five-pass amplifier. The small-angle off-axis five-pass configuration combining with the
gradual expansion of the laser beam cross section makes the amplifier compact and effective.

DOI: 10.1134/S1054660X12070018

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