Performance analysis of the self-referenced speckle-holography image-reconstruction technique

Details Performance analysis of the self-referenced speckle-holography image-reconstruction technique Performance analysis of the self-referenced speckle-holography image-reconstruction technique

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apopt..32.5071w&link_type=abstract

Applied Optics (ISSN 0003-6935), vol. 32, no. 26, p. 5071-5078.

Physics

Optics

12

Image Reconstruction, Imaging Techniques, Speckle Holography, Wave Front Deformation, Atmospheric Correction, Atmospheric Turbulence, Telescopes, Wave Front Reconstruction

Scientific paper

Self-referenced speckle holography (SRSH) is a postdetection turbulence compensation technique for obtaining diffraction-limited imagery from ground-based telescopes degraded by atmospheric turbulence. In SRSH, image-plane information is used together with wave-front distortion information to reconstruct an estimate of the object spectrum. The wave-front distortion information is obtained from a wave-front sensor in the pupil plane of the telescope. This information is used in a postprocessing environment to estimate the point spread function (PSF) of the combined telescope and atmosphere. The PSF is then used to obtain an estimate of the object intensity distribution by deconvolution. SRSH performance is quantified in terms of a system transfer function and a system PSF. The results show how the performance of SRSH is dependent on the sampling intervals and shot noise in the wave-front sensor. The results also indicate how the technique, for a given set of design parameters, responds to changing seeing conditions. SRSH boosts the high spatial frequencies (those near the diffraction limit of the telescope) to nearly 0.6.

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