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Proceedings Paper

Novel wavefront sensor for interferometry
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Paper Abstract

A new design for a wavefront sensor suitable for low-order low-light correction is shown. The hybrid modal sensor, the Nine Element (NE) sensor, is compared with a curvature sensor and quadcell under single aperture applications. The design of the NE sensor allows the use of readily-available array detectors. We discuss the optimization of the design to maximize its performance with respect to the number of Zernike polynomials to detect and optical parameters, using a simulated annealing technique. Numerical simulations show the good SNR response low-light levels, and indicate a reduction in wavefront variance from 6.41 rad2 to 2.01 rad2. The sensitivity to tip/tilt errors is demonstrated to be comparable to a quadcell. Successful closed feedback loop operation results in corrected Strehl ratios of over 0.5. Improvements and future work is discussed.

Paper Details

Date Published: 21 February 2003
PDF: 8 pages
Proc. SPIE 4838, Interferometry for Optical Astronomy II, (21 February 2003); doi: 10.1117/12.459333
Show Author Affiliations
Nazim Ali Bharmal, Cavendish Lab./Univ. of Cambridge (United Kingdom)
David F. Buscher, Cavendish Lab./Univ. of Cambridge (United Kingdom)
Christopher A. Haniff, Cavendish Lab./Univ. of Cambridge (United Kingdom)
Justin I. Read, Institute of Astronomy/Univ. of Cambridge (United Kingdom)

Published in SPIE Proceedings Vol. 4838:
Interferometry for Optical Astronomy II
Wesley A. Traub, Editor(s)

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