| 腔镜热变形对非稳腔光场特性的影响 |
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| 引用本文： | 杜燕贻,安建祝,束小建. 腔镜热变形对非稳腔光场特性的影响[J]. 强激光与粒子束, 2008, 20(8) |
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| 作者姓名： | 杜燕贻 安建祝 束小建 |
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| 作者单位： | 北京应用物理与计算数学研究所,北京,100088;北京应用物理与计算数学研究所,北京,100088;北京应用物理与计算数学研究所,北京,100088 |
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| 基金项目： | 中国物理研究院科研项目 |
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| 摘 要： | 研究了高功率气体激光器中谐振腔腔镜热变形效应。采用时间离散化方法，利用虚共焦折叠非稳腔3维物理光学负载模型和ANSYS热效应计算程序，将光腔稳态模式的快变过程与镜面变形的慢变过程耦合起来，研究了真实器件的腔镜变形和光场模式的相互作用；计算给出了16 s热变形下硅镜和石英镜面输出功率的下降程度和远场光束质量的退变程度：在16 s热效应下，硅镜实际光斑半径与理想光斑半径的比值变化小于1.5，而石英镜值变化达到4，可知长时运行下选用硅镜明显优越于选用石英镜。
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| 关 键 词： | 腔镜热变形 虚共焦非稳腔 光强 相位 输出功率 |
| 收稿时间： | 1900-01-01; |
Effect of thermal distortion of mirror on characteristics of laser beam in unstable resonator |
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| DU Yan-yi,AN Jian-zhu,SHU Xiao-jian. Effect of thermal distortion of mirror on characteristics of laser beam in unstable resonator[J]. High Power Laser and Particle Beams, 2008, 20(8) |
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| Authors: | DU Yan-yi AN Jian-zhu SHU Xiao-jian |
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| Affiliation: | Insdtitute of Applied Physics and Computational Mathematics, P. O. Box 8009, Beijing 100088, China |
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| Abstract: | The thermal distortion effect of resonator mirror in high power gas lasers was investigated. In terms of the method of time discreteness, a 3D physical optic loaded model for folded confocal unstable resonators in negative branch and ANSYS models for thermal effects was used to couple the fast-varying cavity modes and slow-varying physics to mirror distortion. We sloved the interaction between the thermal distortion of mirror and cavity modes. It was shown that, in 16 s running, the change of beam quality was less 1.5 times of diffraction limit for Si mirror, while that is 4 for SiO2 mirror. It is concluded that Si mirror works well than the SiO2 mirror in this kind of designs. |
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| Keywords: | Unstable resonator Intensity Phase Output power |
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