Reducing PSF halo with adaptive pupil masking

James Osborn; Richard M. Myers; Gordon D. Love

doi:10.1117/12.857085

28 July 2010 Reducing PSF halo with adaptive pupil masking

James Osborn, Richard M. Myers, Gordon D. Love

Proceedings Volume 7736, Adaptive Optics Systems II; 77362T (2010) https://doi.org/10.1117/12.857085
Event: SPIE Astronomical Telescopes + Instrumentation, 2010, San Diego, California, United States

Abstract

Adaptive pupil masking can be used to reduce the halo and increase the peak intensity of a point spread function (PSF) using an adaptive pupil mask. Areas of the pupil where the residual wavefront aberrations are large are selected and masked using a spatial light modulator. The technique can be used as a standalone system on a smaller telescope without adaptive optics or in conjunction with an adaptive optics system to further improve the PSF. We find by simulation that for a 1 m telescope and using an 8 × 8 system we can increase the peak intensity by 40 % and reduce the FWHM by 76 % to near the diffraction limit. For an 8 m class telescope with a 16×16 pupil mask and adaptive optics the intensity was found to increase by 23 % and the FWHM reduced from 0.022" to 0.018". We also examine the effects of the adaptive pupil mask on the diffraction limited PSF. The square blocking elements result in a square diffraction pattern superimposed on the standard circular diffraction pattern. The relative strengths of each depend on the fraction of the pupil which is blocked.

Citation Download Citation

James Osborn, Richard M. Myers, and Gordon D. Love "Reducing PSF halo with adaptive pupil masking", Proc. SPIE 7736, Adaptive Optics Systems II, 77362T (28 July 2010); https://doi.org/10.1117/12.857085

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