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Imaging through turbulence with a quadrature-phase optical interferometer

Kern, Brian and Dimotakis, Paul E. and Martin, Chris and Lang, Daniel B. and Thessin, Rachel N. (2005) Imaging through turbulence with a quadrature-phase optical interferometer. Applied Optics, 44 (34). pp. 7424-7438. ISSN 0003-6935. http://resolver.caltech.edu/CaltechAUTHORS:KERao05

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Abstract

We present an improved technique for imaging through turbulence at visible wavelengths using a rotation shearing pupil-plane interferometer, intended for astronomical and terrestrial imaging applications. While previous astronomical rotation shearing interferometers have made only visibility modulus measurements, this interferometer makes four simultaneous measurements on each interferometric baseline, with phase differences of π/2 between each measurement, allowing complex visibility measurements (modulus and phase) across the entire input pupil in a single exposure. This technique offers excellent wavefront resolution, allowing operation at visible wavelengths on large apertures, is potentially immune to amplitude fluctuations (scintillation), and may offer superior calibration capabilities to other imaging techniques. The interferometer has been tested in the laboratory under weakly aberrating conditions and at Palomar Observatory under ordinary astronomical observing conditions. This research is based partly on observations obtained at the Hale Telescope.


Item Type:Article
Additional Information:© 2005 Optical Society of America Received 12 November 2004; revised manuscript received 21 May 2005; accepted 24 May 2005. This research was funded in part by the Air Force Office of Scientific Research (AFOSR) Grants No. F49620-94-1-0283, F49620-00-1-0036, F49620-03-1-0102, F49620-98-1-0052, and DoD-DURIP/AFOSR Grant No. F49620-95-1-0199. This material is based on work supported by the National Science Foundation under Grant No. AST9618880. This work was performed in part under contract with the Jet Propulsion Laboratory (JPL) funded by NASA through the Michelson Fellowship Program. JPL is managed for NASA by the California Institute of Technology. Based partly on observations obtained at the Hale Telescope, Palomar Observatory, as part of a collaborative agreement between the California Institute of Technology, its divisions Caltech Optical Observatories, and the Jet Propulsion Laboratory (operated for NASA), and Cornell University. Bryan Jacoby, Stephen Kaye, and Ryan McLean were invaluable in fielding the QPI.
Subject Keywords:adaptive optics, astronomical optics, interferometry
Record Number:CaltechAUTHORS:KERao05
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:KERao05
Alternative URL:http://www.opticsinfobase.org/abstract.cfm?URI=ao-44-34-7424
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:5589
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:25 Oct 2006
Last Modified:29 Aug 2014 14:36

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