130-W picosecond green laser based on a frequency-doubled hybrid cryogenic Yb:YAG amplifier

Author(s)
Hong, Kyung-Han; Lai, Chien-Jen; Siddiqui, Aleem M.; Kaertner, Franz X.
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Abstract
130-W average-power picosecond green laser pulses at 514.5 nm are generated from a frequency-doubled hybrid cryogenic Yb:YAG laser. A second-harmonic conversion efficiency of 54% is achieved with a 15-mm-long noncritically phase-matched lithium triborate (LBO) crystal from a 240-W 8-ps 78-MHz pulse train at 1029 nm. The high-average-power hybrid laser system consists of a picosecond fiber chirped-pulse amplification seed source and a cryogenically-cooled double-pass Yb:YAG amplifier. The M[superscript 2] value of 2.7, measured at 77 W of second-harmonic power, demonstrates a good focusing quality. A thermal analysis shows that the longitudinal temperature gradient can be the main limiting factor in the second-harmonic efficiency. To our best knowledge, this is the highest-average-power green laser source generating picosecond pulses.
Date issued
2009-09
URI
http://hdl.handle.net/1721.1/64660
Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science; Massachusetts Institute of Technology. Research Laboratory of Electronics
Journal
Optics Express
Publisher
Optical Society of America
Citation
Hong, Kyung-Han, Chien-Jen Lai, Aleem Siddiqui, and Franz X. Kartner, "130-W picosecond green laser based on a frequency-doubled hybrid cryogenic Yb:YAG amplifier," Opt. Express 17, Iss. 19 (September 14, 2009): 16911-16919. © 2009 OSA.
Version: Final published version
ISSN
1094-4087
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