高能激光器自由旋涡气动窗口激光波前畸变的初步研究

分析了用哈特曼 夏克波前传感器研究高能激光器自由旋涡气动窗口对输出激光波前畸变的原理 ,并利用37单元哈特曼波前传感器实验研究自由旋涡气动窗口对输出激光波前的影响。结果表明 ,自由旋涡气动窗口对输出激光波前的影响主要是光束偏转和离焦 ,而其他低阶及高阶像差都比较小。由于透射激光束的偏转是稳定的 ,很容易由倾斜镜进行校正 ,因此稳定工作状态下的自由旋涡气动窗口能够满足实验需求。

Study on the Laser Wavefront Deformation Induced by the Free-vortex Aerodynamic Window for High Energy Lasers

This paper analyzes the principle of wavefront disturbed by the free vortex aerodynamic window(FADW) designed for the high power laser measurement using the Hartmann Shack (H S) sensing, and measures the wavefront when the FADW is running steadily using the H S sensor with 37 sub apertures experimentally. The wavefront attained by CCD detectors is sent to the high speed DSP wavefront processing units. And then it reconstructs the disturbed wavefront using the method of Zernike mode, and calculates the relative optical parameters such as the peak value (PV) of wavefront error, RMS and STREHL raton (R s) and so on.The results shows that the effects on the output laser wavefront of the FADW are mainly the beam deflexion and the beam divergence, otherwise the else high level wavefront errors are very low.