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Diffraction-limited imaging with partially redundant masks. I. Infrared imaging of bright objects

Haniff, Christopher A. and Buscher, David F. (1992) Diffraction-limited imaging with partially redundant masks. I. Infrared imaging of bright objects. Journal of the Optical Society of America A, 9 (2). pp. 203-218. ISSN 1084-7529. http://resolver.caltech.edu/CaltechAUTHORS:HANjosaa92

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Abstract

The utility of partially redundant pupil geometries has been studied in the context of near-infrared speckle imaging with ground-based telescopes. Using both numerical simulations and experimental data collected with a 4-m-class telescope, we find that the decrease in redundancy resulting from apodizing the telescope pupil results in an enhancement of the quality of reconstructed images at high light levels. This improvement in imaging fidelity is particularly valuable when short-term variations in the statistics of the atmosphere make the seeing calibration of speckle interferograms difficult. However, the use of an apodizing mask necessarily restricts the faintest source that can be imaged, leading to a loss in sensitivity of one to two magnitudes. For many of the brighter near-infrared astrophysical sources in the sky that have been the subject of previous speckle-imaging studies, the use of a partially redundant pupil is expected to enhance the fidelity of the imaging procedure considerably.


Item Type:Article
Additional Information:© Copyright 2008 Optical Society of America. Received May 14, 1991; revised manuscript received September 23, 1991; accepted October 4, 1991. Partial financial support for this work was provided by the Royal Commission for the Exhibition of 1851 (D.F. Buscher) and by the North Atlantic Treaty Organization and the Science and Engineering Research Council (C.A. Haniff). Some of the work presented here was carried out using the facilities of the Institute of Astronomy and the Mullard Radio Astronomy Observatory in Cambridge, whose hospitality we acknowledge. We thank Julian Christou and Steve Ridgway for assistance during the planning and execution of the observations described here. The National Optical Astronomy Observatories are operated by the Association of Universities for Research in Astronomy, Inc., under cooperative agreement with the National Science Foundation.
Record Number:CaltechAUTHORS:HANjosaa92
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:HANjosaa92
Alternative URL:http://www.opticsinfobase.org/abstract.cfm?URI=josaa-9-2-203
Official Citation:C. A. Haniff and D. F. Buscher, "Diffraction-limited imaging with partially redundant masks. I. Infrared imaging of bright objects," J. Opt. Soc. Am. A 9, 203- (1992) http://www.opticsinfobase.org/abstract.cfm?URI=josaa-9-2-203
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:11016
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:23 Jun 2008
Last Modified:29 Aug 2014 16:58

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