Strehl ratios with various types of anisoplanatism
Richard J. Sasiela
Lincoln Laboratory, Massachusetts Institute of Technology,
Lexington, Massachusetts 02173-9108
Abstract:
There are many ways in which the paths of two waves through
turbulence can become separated, thereby leading to anisoplanatic
effects. Among these are a parallel path separation, an angular
separation, one caused by a time delay, and one that is due to
differential refraction at two wavelengths. All these effects can
be treated in the same manner. Gegenbauer polynomials are used to
obtain an approximation for the Strehl ratio for these
anisoplanatic effects, yielding a greater range of applicability
than the Maréchal approximation.