Volume 13 Issue 3
Jun.  2020
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GAO Yue-juan, CHEN Fei, PAN Qi-kun, YU Hang-hang, LI Hong-chao, TIAN You-peng. Modeling and numerical simulation of a semiconductor switching device applied in an ultra-short pulse CO2 laser[J]. Chinese Optics, 2020, 13(3): 577-585. doi: 10.3788/CO.2019-0159
Citation: GAO Yue-juan, CHEN Fei, PAN Qi-kun, YU Hang-hang, LI Hong-chao, TIAN You-peng. Modeling and numerical simulation of a semiconductor switching device applied in an ultra-short pulse CO2 laser[J]. Chinese Optics, 2020, 13(3): 577-585. doi: 10.3788/CO.2019-0159

Modeling and numerical simulation of a semiconductor switching device applied in an ultra-short pulse CO2 laser

doi: 10.3788/CO.2019-0159
Funds:  Supported by National Natural Science Foundation of China(No. 61675200); National Science and Technology Major Project 02(No. 2018ZX02102001-002); Open Fund Project of the State Key Laboratory of Laser and Material Interaction (No. SKLLIM1611); Youth Innovation Promotion Association (No. 2017259)
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  • Corresponding author: feichenny@126.com
  • Received Date: 25 Jul 2019
  • Rev Recd Date: 30 Aug 2019
  • Publish Date: 01 Jun 2020
  • The physical mechanism are studied for ultra-short pulse CO2 laser output realized by semiconductor switching technology. Firstly, based on the analysis of the generation, recombination and diffusion mechanism of laser-produced carriers, we introduce direct absorption, Auger recombination, plasmon-assisted recombination, an ambipolar diffusion process and according to Drude theory, we improve the theoretical model of semiconductor switching. Secondly, we simulate and analyze the generation of ultra-short CO2 pulses by two-stage semiconductor optical switches employing this model. The results show that the model is in good agreement with the latest experimental results reported abroad, which implies the rationality and correctness of the model. Finally, the model is used to analyze the effect of control pulse duration on the efficiency of the two-stage switching. It is found that a short control pulse is more conducive to intercepting high-quality ultra-short CO2 pulses accurately and efficiently. Semiconductor switching is an effective technique to realize the output of an ultra-short CO2 laser with an adjustable pulse width.

     

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