Chinese Journal of Quantum Electronics ›› 2022, Vol. 39 ›› Issue (4): 574-582.doi: 10.3969/j.issn.1007-5461.2022.04.012

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Study on Yb: KGW regenerative amplifier based on improved Frantz-Nodvik equation

KANG Renzhu1;2, LYU Renchong1;2, TENG Hao2;4, ZHU Jiangfeng1, WEI Zhiyi1;2;3;4   

  1. ( 1 School of Physics and Optoelectronic Engineering, Xidian University, Xi’an 710071, China; 2 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; 3 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China; 4 Songshan Lake Materials Laboratory, Dongguan 523808, China )
  • Received:2021-01-15 Revised:2021-02-06 Published:2022-07-28 Online:2022-07-28

Abstract: The process of ultrafast laser regenerative amplification has complex dynamic behavior that requires to build a model for solution and iterative calculation. Based on the improved Frantz-Nodvik equation, the output properties of the Yb:KGW regenerative amplifier are calculated, the influences of pumping intensity, crystal length and pumping duration on the output performance of the amplifier are investigated, and the output behaviors of the regenerative amplifier with different repetition rates are also analyzed. Based on the theoretical analysis, a regenerative amplifier is constructed and the laser amplification results with pulse energy of 1 mJ at repetition rate of 1 kHz are realized, which are in good agreement with the theoretical analysis results. The improved Frantz-Nodvik equation gives an insight into the design of laser amplification which is scalable to high pulse energy with high stability at high repetition rate.

Key words: laser techniques, Frantz-Nodvik equation, ytterbium-doped amplifier, regenerative amplifier

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