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Noise in optical synthesis images. II. Sensitivity of an ^nC_2 interferometer with bispectrum imaging

Kulkarni, Shrinivas R. and Prasad, Sudhakar and Nakajima, Tadashi (1991) Noise in optical synthesis images. II. Sensitivity of an ^nC_2 interferometer with bispectrum imaging. Journal of the Optical Society of America A, 8 (3). pp. 499-510. ISSN 0740-3232. http://resolver.caltech.edu/CaltechAUTHORS:20120423-105227789

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Abstract

We study the imaging sensitivity of a ground-based optical array of n apertures in which the beams are combined pairwise, as in radio-interferometric arrays, onto n(n - 1)/2 detectors, the so-called ^nC_2 interferometer. Groundbased operation forces the use of the fringe power and the bispectrum phasor as the primary observables rather than the simpler and superior observable, the Michelson fringe phasor. At high photon rates we find that bispectral imaging suffers no loss of sensitivity compared with an ideal array (space based) that directly uses the Michelson fringe phasor. In the opposite limit, when the number of photons per spatial coherence area per coherence time drops below unity, the sensitivity of the array drops rapidly relative to an ideal array. In this regime the sensitivity is independent of n, and hence it may be efficient to have many smaller arrays, each operating separately and simultaneously.


Item Type:Article
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URLURL TypeDescription
http://dx.doi.org/10.1364/JOSAA.8.000499 DOIUNSPECIFIED
http://www.opticsinfobase.org/josaa/abstract.cfm?uri=josaa-8-3-499PublisherUNSPECIFIED
Additional Information:© 1991 Optical Society of America. Received April 9, 1990; accepted September 17, 1990. Shrinivas R. Kulkarni gratefully acknowledges financial support from the W. M. Keck Foundation. The research of Sudhakar Prasad was supported partially by the Sandia National Laboratories under a Sandia University Research Program contract. Shrinivas R. Kulkarni is a National Science Foundation Presidential Young Investigator and an Alfred P. Sloan Fellow. Tadashi Nakajima holds a Center for Astrophysics Postdoctoral Fellowship. We are grateful to Chris Haniff for several animated discussions on the virtues of self-calculation. We thank Andrea Ghez for a careful reading of the manuscript. We thank the two referees for sharpening up some of the discussion in the paper.
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W. M. Keck FoundationUNSPECIFIED
Sandia University Research ProgramUNSPECIFIED
National Science FoundationUNSPECIFIED
Alfred P. Sloan FoundationUNSPECIFIED
Record Number:CaltechAUTHORS:20120423-105227789
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20120423-105227789
Official Citation:Shrinivas R. Kulkarni, Sudhakar Prasad, and Tadashi Nakajima, "Noise in optical synthesis images. II. Sensitivity of ann C2 interferometer with bispectrum imaging," J. Opt. Soc. Am. A 8, 499-510 (1991) http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-8-3-499
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ID Code:30255
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:23 Apr 2012 21:41
Last Modified:26 Dec 2012 15:06

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