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设计稳定可靠的THz激光器,缩小THz激光器的体积一直是THz领域的研究热点。基于速率方程组,建立了光泵THz激光器的理论模型。数值模拟和分析了不同工作温度、腔内压强、腔尺寸、泵浦光波动等因素对THz激光输出产生的影响。研究结果表明:泵浦光功率越高,THz激光输出对工作温度的变化越敏感,则越有必要建立稳定可靠的温度控制系统;在保持功率输出一定的前提下,通过适当提高THz激光腔内工作气体压强,可以缩小THz激光器的体积;泵浦光功率越低,THz激光的输出性能对泵浦光功率波动及频率漂移越敏感,此时,需要对泵浦光稳定性进行控制,更为关键的在于控制泵浦光的频率稳定性。
Designing a stable and reliable THz laser and reducing the volume of the THz laser has always been a hot topic in THz field. Based on the rate equations, a theoretical model of optical pumping THz laser was established. Numerical simulation and analysis of different operating temperature, cavity pressure, cavity size, pump light fluctuations and other factors on the THz laser output. The results show that the higher the pump power is, the more sensitive the output of THz laser is to the change of operating temperature. So it is necessary to establish a stable and reliable temperature control system. Under the premise of keeping the power output constant, The working gas pressure can reduce the volume of the THz laser. The lower the pump light power, the more sensitive the output performance of the THz laser is to the pump power fluctuation and the frequency drift. In this case, the stability of the pump light needs to be controlled, The key is to control the frequency stability of the pump light.