强激光与粒子束, 2015, 27 (4): 043102, 网络出版: 2015-04-14
光泵THz激光器复合型输出耦合镜的设计和研究
Theoretical study of hybrid output coupler for optically pumped THz laser
光泵太赫兹激光器 大功率CO2激光泵浦 复合型输出耦合镜 楔形输出耦合镜 optically pumped THz laser high power CO2 laser pump hybrid output coupler wedged output coupler
摘要
阐述了平行和楔形衬底复合型输出耦合镜(HOC)的反射率、透射率和损耗的计算方法,特别引入了品质因子进行损耗分析,可正确评价HOC质量的优劣。模拟了楔形衬底中楔角的变化对F-P效应调制的改善程度,楔角增大到0.3°时,HOC的透射率对波长和衬底厚度的微小变化不再敏感。楔形衬底使输出THz光斑在y方向上发生畸变,但0.3°楔角时输出光斑仍可保持较好的高斯形状。
Abstract
This research presents the calculation method of transmittance, reflectance and loss for hybrid output coupler (HOC). We introduce Q factor for loss analyses to evaluate the quality of HOC. We simulate the suppression of F-P etalon effect and distortion of output THz beam pattern with a wedged substrate. A 0.3° wedge angle makes transmittance not sensitive to small change of wavelength and substrate thickness. The distortion introduced by the 0.3° wedge angle will not dramatically change the Gaussian beam pattern.
孔维鹏, 王度, 郭超, 陈晨, 李赜宇, 罗振飞, 周逊. 光泵THz激光器复合型输出耦合镜的设计和研究[J]. 强激光与粒子束, 2015, 27(4): 043102. Kong Weipeng, Wang Du, Guo Chao, Chen Chen, Li Zeyu, Luo Zhenfei, Zhou Xun. Theoretical study of hybrid output coupler for optically pumped THz laser[J]. High Power Laser and Particle Beams, 2015, 27(4): 043102.