Theoretical study of hybrid output coupler for optically pumped THz laser
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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。
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关键词:
- 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
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. -
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