Abstract

The influence of the turbulence outer scale on the Strehl ratio obtained with low-order adaptive optics systems is examined by numerical simulation. The Karhunen–Loeve approach is used to generate wave-front samples. A method that allows construction of the outer-scale-dependent Karhunen–Loeve functions is described. It is shown that the Strehl ratio produced by a second-order adaptive optics correction (tip–tilt, defocus, and astigmatism) is affected quite strongly by the finite outer scale. For the higher-order correction, the effect under study is weak and appears only when the outer-scale magnitude becomes less than the aperture diameter. It is also shown that the finite outer scale has a positive effect on the Strehl ratio of the uncorrected long-exposure image.

© 1998 Optical Society of America

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