Novel wavefront sensor for interferometry

Nazim Ali Bharmal; David F. Buscher; Christopher A. Haniff; Justin I. Read

doi:10.1117/12.459333

21 February 2003 A novel wavefront sensor for interferometry

Nazim Ali Bharmal, David F. Buscher, Christopher A. Haniff, Justin I. Read

Proceedings Volume 4838, Interferometry for Optical Astronomy II; (2003) https://doi.org/10.1117/12.459333
Event: Astronomical Telescopes and Instrumentation, 2002, Waikoloa, Hawai'i, United States

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.

Citation Download Citation

Nazim Ali Bharmal, David F. Buscher, Christopher A. Haniff, and Justin I. Read "A novel wavefront sensor for interferometry", Proc. SPIE 4838, Interferometry for Optical Astronomy II, (21 February 2003); https://doi.org/10.1117/12.459333

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