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.

Date Published: 27 September 1999
PDF: 8 pages
Proc. SPIE 3762, Adaptive Optics Systems and Technology, (27 September 1999); doi: 10.1117/12.363586

Published in SPIE Proceedings Vol. 3762:
Adaptive Optics Systems and Technology
Robert K. Tyson; Robert Q. Fugate, Editor(s)