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Proceedings Paper

Reducing PSF halo with adaptive pupil masking
Author(s): James Osborn; Richard M. Myers; Gordon D. Love
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Paper 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.

Paper Details

Date Published: 28 July 2010
PDF: 7 pages
Proc. SPIE 7736, Adaptive Optics Systems II, 77362T (28 July 2010); doi: 10.1117/12.857085
Show Author Affiliations
James Osborn, Durham Univ. (United Kingdom)
Richard M. Myers, Durham Univ. (United Kingdom)
Gordon D. Love, Durham Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 7736:
Adaptive Optics Systems II
Brent L. Ellerbroek; Michael Hart; Norbert Hubin; Peter L. Wizinowich, Editor(s)

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