期刊
APPLIED SCIENCES-BASEL
卷 10, 期 19, 页码 -出版社
MDPI
DOI: 10.3390/app10196891
关键词
picosecond; high repetition; Nd; YAG laser system; depolarization compensation
类别
资金
- Shanghai Sailing Program [18YF1425900]
- National Natural Science Foundation of China [11774364]
- Bureau of International Cooperation, Chinese Academy of Sciences [181231KYSB20170022]
- Strategic Priority Research Program of Chinese Academy of Sciences [XDA25020302]
Compact, stable, high-power and high repetition rate picosecond laser systems are excellent sources for optical parametric chirped pulse amplification systems and laser satellite ranging systems. Compared with the traditional complex high-power amplifier, this article reports a compact high-power picosecond laser system at a repetition rate of 1 kHz based on Nd:YAG bulk crystal. The thermal lens effect limits the regenerative amplifier to directly output higher energy. For this reason, multi-stage traveling-wave amplifiers are usually used to gradually increase the laser pulse energy. So as to achieve a compact structure, a regenerative amplifier that can output higher power at 1 kHz is designed in the laser system. The regenerative amplifier can output the power of 6.5 W at the pump power of 41.5 W; the beam quality of M-2 factor was about 1.3. A more flexible thermal depolarization compensation structure is applied in the side-pumped amplifier, which can effectively compensate for thermal lens effect and thermal depolarization at different pump powers. Finally, the laser pulse can achieve an output power higher than 50 W at 1 kHz after passing through an end-pumped traveling-wave amplifier and a side-pumped traveling wave amplifier.
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