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Diffraction-limited imaging with partially redundant masks: I. Optical imaging of faint sources

Buscher, David F. and Haniff, Christopher A. (1993) Diffraction-limited imaging with partially redundant masks: I. Optical imaging of faint sources. Journal of the Optical Society of America A, 10 (9). pp. 1882-1894. ISSN 1084-7529.

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In a recent paper [J. Opt. Soc. Am. A 9, 203 (1992)] the benefits of pupil apodization were examined for the near-infrared imaging of bright sources. In the current paper we extend these considerations to optical speckle imaging, in which photon noise rather than detector readout noise is important. We demonstrate that a one-dimensional pupil geometry (i.e., a thin slit) has several advantages over an unapodized aperture when faint sources are being observed through atmospheric turbulence. The use of a slit aperture does not decrease the signal-to-noise ratios of the power-spectrum and bispectrum measurements, and in many cases it increases them, despite the large reduction in signal level. The disadvantage of this apodization is a reduction in Fourier-plane coverage, which must be compensated for by observations with the slit aligned at several position angles. The performance of many of the current generation of photon-counting imaging detectors deteriorates at the high counting rates that can be experienced even when one is observing sources that are approaching the limiting magnitude of the speckle imaging technique. Under such conditions, we recommend the use of an apodized pupil, in contrast to the current preference for employing a neutral-density filter to reduce the detector count rate.

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Additional Information:© Copyright 1993 Optical Society of America. Received August 19, 1992; revised manuscript received March 23, 1993; accepted March 30, 1993. We acknowledge the assistance of G. Neugebauer, S. Kulkarni, P. Gorham, K. Matthews, and A. Ghez, without whom the observations reported here would not have been possible. D. Buscher is employed by the Universities Space Research Association, 300 D Street, S.W., Washington, D.C. 20024, under contract with the Naval Research Laboratory/U.S. Naval Observatory Optical Interferometer Project. C. Haniff acknowledges financial support for this work from NATO, the UK Science and Engineering Research Council, and Christ's College, Cambridge, and thanks J.C. Dainty for the loan of computing hardware during the completion of this study.
Issue or Number:9
Record Number:CaltechAUTHORS:BUSjosaa93
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Official Citation:D. F. Buscher and C. A. Haniff, "Diffraction-limited imaging with partially redundant masks: I. Optical imaging of faint sources," J. Opt. Soc. Am. A 10, 1882-1894 (1993)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:9960
Deposited By: Archive Administrator
Deposited On:28 Mar 2008
Last Modified:03 Oct 2019 00:05

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