大通光孔径气动窗口光学特性研究

• 作 者: 张耀宁 程祖海 李锋 杜泽明 金元俊
• 机 构: 华中理工大学激光技术国家重点实验室!武汉,430074,华中理工大学激光技术国家重点实验室!武汉,430074,华中理工大学激光技术国家重点实验室!武汉,430074,华中理工大学激光技术国家重点实验
• 出 处: 激光技术
• 发表日期: 2000年02期
• 关键词: 气动窗口 光束质量 波像差

实验研究了引射式大通光孔径气动窗口光学特性。由哈特曼激光光束诊断仪采集的数据给出了激光束通过气动窗口后的Strehl比 ,波像差 ,Zernike多项式各系数。从这些光学特性参数可以分析引射气压、气动窗口结构对通光光束质量的影响。研究表明随引射气压增加使通光光束发散 ,这和环形喷嘴喷出的气流形成的轴向气体密度分布的梯度变大有关。非均匀分布的抽口使波阵面偏斜 ,这会使光束漂移。

The optical characteristics of a catoptric aperture optical aperture were experimentally studied. Data collected by the Hartman laser beam scanner give the Strehl ratio, wave aberration, and coefficients of the Zernike polynomial after the laser beam passes through the pneumatic window. From these optical characteristics parameters can be analyzed by the injection pressure, the structure of the pneumatic window on the light beam quality. The research shows that with the increase of the induced pressure, the transmitted light beam is divergent, which is related to the gradient of the axial gas density distribution formed by the air flow ejected by the annular nozzle. Unevenly distributed nozzles deflect the wavefront, which can drift the beam.