Multiple-aperture averaging technique for measuring full aperture tilt with a laser guide star

Mikhail S. Belen'kii

doi:10.1117/12.290142

17 October 1997 Multiple-aperture averaging technique for measuring full aperture tilt with a laser guide star

Mikhail S. Belen'kii

Proceedings Volume 3126, Adaptive Optics and Applications; (1997) https://doi.org/10.1117/12.290142
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

Abstract

A method for measuring full aperture tilt with a laser guide star (LGS) is described. The method uses a single monochromatic LGS formed by a laser beam transmitted through the main telescope and two arrays of small auxiliary telescopes separated from the main telescope in transverse directions. To achieve the Strehl ratio required for practical adaptive optics (AO) systems, the method uses an averaging of the LGS image over the position of the auxiliary telescope in the telescope array and over position of a subaperture within the auxiliary telescope, along with integration over FOV of the receiver and over time. I show that the contribution of the down propagation path can be considerably reduced by increasing the number of auxiliary telescopes and the number of subapertures, as well as by time integration. With this method Strehl ratio equal to 0.7 can be achieved for various seeing conditions, telescope diameter, and wavelength, including a visible waveband.

Citation Download Citation

Mikhail S. Belen'kii "Multiple-aperture averaging technique for measuring full aperture tilt with a laser guide star", Proc. SPIE 3126, Adaptive Optics and Applications, (17 October 1997); https://doi.org/10.1117/12.290142

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