激光实际大气水平传输湍流畸变波前的功率谱分析II:波前相位与格林伍德频率

Power Spectra Analysis of the Disturbed Wavefront in Laser Beam Horizontal Atmospheric Propagation II: Wavefront Phase and Greenwood Frequency

分析了整体倾斜像差去除前后大气湍流畸变波前相位的功率谱。在激光实际大气水平传输实验中 ,利用 6 1单元自适应光学系统的哈特曼波前传感器 ,测量和分析了大气湍流畸变波前相位的功率谱。还建立了一种根据实际测量的波前相位功率谱数据估测自适应光学系统变形镜需要控制带宽大小和大气湍流格林伍德 (Greenwood)频率的方法。

By using the Hartmann Shack wavefront sensor of the 61 element adaptive optical system, power spectra density (PSD) of the atmosphere disturbed wavefront, both overall tilt removed and leave in, was measured and analyzed. A method of calculating the Greenwood frequency and the needed control bandwidth of the deformable mirror of an adaptive optical system from measured PSDs was discussed.