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Research on output frequency characteristics of optically pumped THz gas laser

机译：光泵浦太赫兹气体激光器的输出频率特性研究

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摘要

Considering the two-photon light shift (TPLS) effect and the Doppler shift effect, the model of the output frequency of the optically pumped THz gas laser has been built up. The influence of the TPLS and the Doppler shift effects on THz output frequency stability has been analyzed theoretically and numerically. Results indicate that, increasing the pump laser power may degrade the THz output frequency stability to some extent. When only considering the TPLS, with certain pump laser power, the THz frequency shift increases first and then decreases with the increasing of the pump laser frequency offset. In addition, the THz frequency shift tends to decrease gradually with the increasing of the gas pressure and the operating temperature. However, further considering the influence of the Doppler shift effect simultaneously, the THz frequency shift tends to increase nearly linearly with the pump frequency offset. The results provide reference to improve output frequency stability of the optically pumped THz gas laser.
机译：考虑到两光子的光位移（TPLS）效应和多普勒位移效应，建立了光泵浦太赫兹气体激光器的输出频率模型。从理论和数值上分析了TPLS和多普勒频移效应对THz输出频率稳定性的影响。结果表明，增加泵浦激光功率可能会在一定程度上降低THz输出频率的稳定性。仅考虑TPLS时，在一定的泵浦激光功率下，THz频移首先增加，然后随泵浦激光频率偏移的增加而减小。另外，随着气压和工作温度的升高，THz频移趋于逐渐减小。但是，进一步考虑多普勒频移效应的影响，THz频移趋于随泵频偏移几乎线性增加。研究结果为提高光抽运太赫兹气体激光器的输出频率稳定性提供了参考。

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