光泵THz激光器输出特性的影响因素分析.pdfVIP

第44卷第7期 红外与激光工程 2015年7月 Vol.44No.7 InfraredandLaserEngineering Jul.2015 光泵THz激光器输出特性的影响因素分析 李 婷袁郭晓阳袁孟庆龙袁张 彬 (四川大学 电子信息学院袁四川 成都 610065) 摘 要院设计稳定可靠的THz激光器袁缩小THz激光器的体积一直是THz领域的研究热点遥 基于速 率方程组袁建立了光泵THz激光器的理论模型遥数值模拟和分析了不同工作温度尧腔内压强尧腔尺寸尧 泵浦光波动等因素对THz激光输出产生的影响遥研究结果表明院泵浦光功率越高袁THz激光输出对工 作温度的变化越敏感袁则越有必要建立稳定可靠的温度控制系统曰在保持功率输出一定的前提下袁通 过适当提高THz激光腔内工作气体压强袁可以缩小THz激光器的体积曰泵浦光功率越低袁THz激光的 输出性能对泵浦光功率波动及频率漂移越敏感袁此时袁需要对泵浦光稳定性进行控制袁更为关键的在 于控制泵浦光的频率稳定性遥 关键词院光泵THz激光器曰 速率方程组曰 输出功率曰 影响因素曰 THz激光的稳定性曰 频率漂移 中图分类号院TN248 文献标志码院A 文章编号院1007-2276(2015)07-1980-06 Analysis ofimpactfactors ofoutputcharacteristicsfor optically pumped THzlasers Li Ting, Guo Xiaoyang, Meng Qinglong, Zhang Bin (School of Electronics and Information Engineering, Sichuan University, Chengdu 610065, China) Abstract: 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