Experimental validation of Fourier-transform wave-front reconstruction at the Palomar Observatory |
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Authors: | Poyneer Lisa A Troy Mitchell Macintosh Bruce Gavel Donald T |
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Institution: | Lawrence Livermore National Laboratory, Livermore, California 94550, USA. poyneeer1@llnl.gov |
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Abstract: | Wave-front reconstruction with use of the Fourier transform has been validated through theory and simulation. This method provides a dramatic reduction in computational costs for large adaptive (AO) systems. Because such a reconstructor can be expressed as a matrix, it can be used as an alternative in a matrix-based AO control system. This was done with the Palomar Observatory AO system on the 200-in. Hale telescope. Results of these tests indicate that Fourier-transform wave-front reconstruction works in a real system. For both bright and dim stars, a Hudgin-geometry Fourier-transform method produced performance comparable to that of the Palomar Adaptive Optics least squares. The Fried-geometry method had a noticeable Strehl ratio performance degradation of 0.043 in the K band (165-nm rms wave-front error added in quadrature) on a dim star. |
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