光泵THz激光器输出特性的影响因素分析  

Analysis of impact factors of output characteristics for optically pumped THz lasers

作　　者：李婷[1] 郭晓阳[1] 孟庆龙[1] 张彬[1] 

机构地区：[1]四川大学电子信息学院,四川成都610065

出　　处：《红外与激光工程》2015年第7期1980-1985,共6页Infrared and Laser Engineering

基　　金：中国工程物理研究院太赫兹科学技术基金项目(CAEPTHZ201305);四川省教育厅创新团队计划资助(13Td0048)

摘　　要：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 stable and reliable THz lasers as well as reducing dimension of THz lasers have always been a hot research spot in THz field. Based on the rate equations, the model of optically pumped THz lasers has been built up. The effects of the operating temperature, the pressure in cavity, the dimension of cavity and the stability of pump laser on the output characteristics of optically pumped THz lasers have been simulated and analyzed. The results show that it is necessary to realize the reliable temperature control since the output of THz laser becomes more and more sensible for the higher pump power. In order to reduce the dimension of THz lasers, the output power of THz lasers could be ensured by appropriately increasing the pressure of working gas in THz cavity. THz output characteristics are more sensitive to the fluctuation of pump power and the drift of pump frequency for the lower power of pump laser. Consequently, the stability of pump laser should be controlled, especially for the stability of pump frequency.

关 键 词：光泵THz激光器 速率方程组 输出功率 影响因素 THz激光的稳定性 频率漂移 

分 类 号：TN248[电子电信—物理电子学]