激光大气水平传输湍流畸变波前的功率谱分析I:波前整体倾斜与泰勒频率

Power Spectra Analysis of the Disturbed Wavefront in Laser Beam Horizontal Atmospheric Propagation I: Wavefront Overall Tilt and Tyler Frequency

利用自适应光学系统的哈特曼 (Hartmann)波前传感器 ,测量了激光实际大气水平传输湍流畸变波前中整体倾斜像差的时间功率谱 ,发现功率谱谱形与科尔莫戈罗夫 (Kolmogorov)湍流理论不完全符合。建立了一种根据实际测量的整体倾斜功率谱估测自适应光学系统倾斜镜需要的控制带宽大小和大气湍流的泰勒 (Tyler)频率指标的方法。

By using the Hartmann Shack wavefront sensor of an adaptive optical system, power spectra density (PSD) of the atmosphere disturbed wavefront overall tilt was measured and analyzed. It is shown that the measured PSDs are different from the theoretic results of Kolmogorov turbulence given by Tyler. A method of calculating the Tyler frequency and the required control bandwidth of the fast steering mirror of an adaptive optical system from measured overall tilt PSDs was discussed too.