Highly efficient cryogenically-cooled Yb:YAG laser |
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| Authors: | J Kawanaka Y Takeuchi A Yoshida S J Pearce R Yasuhara T Kawashima and H Kan |
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| Institution: | (1) AO Research Institute, Davos, Switzerland;(2) AO Development Institute, Davos, Switzerland;(3) Institute of Applied Physics, University of Berne, Berne, Switzerland;(4) Institute of Biomedical Engineering of the University and ETH Zurich, Zurich, Switzerland;(5) Musculoskeletal Research, Schulthess Clinic, Lengghalde 2, 8008 Zurich, Switzerland |
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| Abstract: | A MOPA laser system for high pulse energy and high average power has been developed by using a cryogenic Yb:YAG. In the regenerative
amplifier with our original TRAM architecture, the high pulse energies of 6.5 and 1.5 mJ were obtained at the repetition rate
of 200 Hz and 1 kHz, respectively. An optical efficiency was as high as ηo-o = 9.3% with an excellent beam quality of M
2 < 1.1, which ensured that a cryogenic Yb:YAG TRAM had a high thermal strength. The following four pass power amplifier with
a cryogenic Yb:YAG rod showed 140 mJ at 100 Hz. Both a high optical efficiency of ηo-o = 30% and a high slope efficiency of ηs = 44% showed that an efficient laser operation could be realized for a power amplification with both a high pulse energy
and a high average power by using a cryogenic Yb:YAG. |
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