脉冲 TEA CO2激光器输出模拟

摘要

In order to study effect of gas ratio , pumping electron density and cavity length on output power of pulse transversely excited atmospheric ( TEA) CO2 laser, six temperature models were employed to analyze the energy transfer among different molecular vibration modes of working gas and the output power of laser by theoretical analysis and numerical simulation.The simulation was in good agreement with the experimental data .The results show that when the volume ratio of CO2 , N2 , and He rises from 4∶30∶65 to 6∶30∶65, the pulse power increases and the delay time gets shorter .When the volume ratio of CO2, N2, and He rises from 5∶15∶65 to 5∶35∶65, the pulse power firstly increases and then decreases , and reaches the maximum at the volume ratio of N 2 about 25.When the volume ratio of CO 2 , N2 , and He is 5∶30∶65, the maximum pumping electron density rises from 4 ×1012/cm3 to 6 ×1012/cm3 , and the cavity length rises from 2m to 4m, the pulse power will gradually increase .The pulse power is greater , the delay time is shorter , and the tailing phenomenon is more longer .The simulation results show that gas ratio , pumping electron density and cavity length have effects on pulse output power .The study provides a reference for design and optimization of CO 2 lasers.%为了研究气体配比、抽运电子密度、腔长对脉冲横向激励大气压CO2激光器输出功率的影响，采用了六温度模型的方法，对工作气体中不同分子振动模式间的能量转移和激光输出功率进行了理论分析和模拟。当CO2，N2，He的体积比由4∶30∶65上升到6∶30∶65时，脉冲功率增加，输出延迟时间变短；当CO2，N2，He的体积比由5∶15∶65上升到5∶35∶65时，脉冲功率按先增加后减小的趋势变化，在N2比例约为25时达到最大；当CO2，N2，He的体积比为5∶30∶65、最大抽运电子密度由4×1012／cm3增加到6×1012／cm3、腔长由2m增加到4m时，脉冲功率都会逐渐增加；脉冲功率越大时，输出延迟时间越短，但有更长的拖尾现象。结果表明，气体配比、抽运电子密度、腔长对脉冲输出功率有影响，该研究为设计和优化激光器提供了参考。