激光技术, 2017, 41 (6): 846, 网络出版: 2017-11-27  

用于高功率径向偏振光的组合轴锥镜设计

Design of combined axicon for high power radial polarized light
作者单位
华中科技大学 光学与电子信息学院 激光加工国家工程中心, 武汉 430074
摘要
为了提升激光器径向偏振光的输出功率, 改进了原有W形轴锥镜内锥角为90°的结构。为研究光束在轴锥尾镜单元的传输特性, 采用几何光学分析了轴向入射下、W形轴锥镜底角为90°时, 内锥角的改变对出射光的影响, 发现出射光的位置及方向不发生变化; 为研究轴锥镜的热畸变特性, 模拟了W形轴锥镜的温度形变, 可知内锥角变大时整体温度变小且分布更加均匀。结果表明, 随着内锥角的变大, 光束中心的光程减少量相对于光束边沿的光程减少量增大;采用Fox-Li数值迭代法模拟了引入上述形变后谐振腔的激光模式, 得出在内锥角为100°时温度形变对光束模式的影响最小。通过对W形轴锥镜温度形变的研究, 可为优化W形轴锥镜的设计提供参考。
Abstract
In order to increase the output laser power of radically polarized light, a W-axicon was improved by changing the internal cone angle. For a W-axicon with the external cone angle of 90°, the position and direction of the reflected light will not change for different internal cone angles through analysis according to geometrical optics. In order to study the thermal distortion characteristics of the axis cone mirror, temperature deformation simulation was conducted. The result shows that the overall temperature becomes smaller and the distribution is more uniform when the inner cone angle increases. As the inner cone angle becomes larger, the decrease in the optical path of the beam center increases with respect to the decrease in the optical path edge. The Fox-Li numerical iteration was used to simulate the laser mode of the resonator. It is found that the effect of temperature deformation on the laser mode is least when the inner cone angle is 100°. The study of W-axicon temperature deformation can provide reference for W-axicon design.

王智用, 胡友友, 李波, 岳建堡, 李杰雄. 用于高功率径向偏振光的组合轴锥镜设计[J]. 激光技术, 2017, 41(6): 846. WANG Zhiyong, HU Youyou, LI Bo, YUE Jianbao, LI Jiexiong. Design of combined axicon for high power radial polarized light[J]. Laser Technology, 2017, 41(6): 846.

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