Theoretical Consideration for Experimental Results on CO2 Gas-Dynamic Laser
Theoretical Consideration for Experimental Results on CO2 Gas-Dynamic Laser
复制标题
CO2气体动力激光器实验结果的理论思考
DOI：
10.1143/jpsj.39.1351
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发表时间：
1975
影响因子：
1.7
通讯作者：
T. Sekiguchi
中科院分区：
文献类型：
--
作者：
Kohnosuke Sato;T. Sekiguchi
从理论上研究了CO2气体动力激光器的基本特性。提出了一种简化的振动弛豫过程理论模型。利用该模型计算了CO2 GDL的布居反转和小信号增益。将计算结果与已有的实验结果(J.Phys.SoC。日本36(1974)880)。证实了CO2气体扩散层中的振动弛豫过程可以看作是恒温条件下的弛豫过程和超音速喷管流动中的气动冷却过程的结合。此外，我们还发现，Schwartz-Slawsky-Herzfeld(SSH)关于振动弛豫时间随温度变化的理论即使在300K以下的低温区也是近似成立的。同时还指出，快速冷却条件下的振动弛豫时间比加热阶段的要短得多(约为原来的10~100倍)。
Basic characteristics of CO 2 gas-dynamic laser (GDL) are investigated theoretically. A simplified theoretical model of vibrational relaxation processes is proposed. The population inversion and the small signal gain of the CO 2 GDL are calculated by using this model. The results are compared with the previous experimental results (J. Phys. Soc. Japan 36 (1974) 880). It is confirmed that the vibrational relaxation processes in the CO 2 GDL may be considered as the combination of the relaxation processes in a constant-temperature condition and the gasdynamic cooling processes in a supersonic nozzle flow. In addition, it is found that the Schwartz-Slawsky-Herzfeld (SSH) theory on the temperature dependence of vibrational relaxation times is approximately valid even in a low temperature region below 300 K. It is also suggested that the values of vibrational relaxation time under the condition of rapid cooling are much shorter (by a factor of 10 to 100) than those in heating phase.