Compensation effectiveness analysis of low-order-correction adaptive optical system for non-Kolmogorov turbulence

摘要

Abstract: For non-Kolmogorov turbulence, phase structure function, residual phase structure function and long-exposure modulation transfer function (MTF) of low-order correction adaptive optical system are deduced by introducing generalized phase spatial spectrum. The analysis shows long- exposure MTF is as functions of $Beta@, which is the power- law exponent of phase power spectrum, and $rho$-0$/, which indicates the strength of atmospheric turbulence. Numerical results of long-exposure MTF, Strehl ratio and FWHM for different $Beta and $rho$-0$/ are presented under the following conditions respectively: (1) the wavefront disturbance is not correcte,d namely open-loop; (2) the wavefront tilts are corrected; (3) one order and two order modes are corrected. !12