Zernike decomposition of anisoplanatism for laser beacons and natural guide stars

Details Zernike decomposition of anisoplanatism for laser beacons and natural guide stars Zernike decomposition of anisoplanatism for laser beacons and natural guide stars

May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994spie.2201..636s&link_type=abstract

Proc. SPIE Vol. 2201, p. 636-642, Adaptive Optics in Astronomy, Mark A. Ealey; Fritz Merkle; Eds.

Physics

Optics

1

Scientific paper

Both laser guide stars and natural guide stars may be used to sample atmospheric turbulence for adaptive optics. The phase representing the turbulence can be expanded as Zernike polynomials across a circular aperture. Assuming a Kolmogorov phase spectrum and C(superscript 2)(subscript n) profile the error induced in using off-axis source to correct for atmospheric phase can be calculated for Zernike modes. Small-angle approximations of analytic results are presented and compared with the analytic expressions for model C(superscript 2)(subscript n) profiles. A numerical simulation of the analagous errors for the models using an on-axis sodium layer laser guide star is also presented.

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