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Proceedings Paper

A high-Strehl low-resolution optical imager (BESSEL): a measurement of the inner scale of turbulence
Author(s): Mary Anne Peters; Laird M. Close; Tom Stalcup; Matt Rademacher; Grover A. Swartzlander; Erin L. Ford; Rukiah S. Abdul-Malik
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Paper Abstract

We have constructed a high-speed image stabilization system, BESSEL, that is capable of performing wavefront correction at a rate exceeding 1 kHz. BESSEL achieved on-sky Strehl ratios of 98-99% at 800 nm as we approached the inner scale of atmospheric turbulence when the refractor telescope aperture was stopped down to 25.4 mm (~r0/2). This is better than expected from Kolmogorov theory, indicating that at D ~r0/2 we are within the inner scale of turbulence. Utilizing high Strehls and the technique of roll subtraction enabled BESSEL to resolve the binary, ADS 10418AB, with separation of only 0.71 λ/D and a delta magnitude of ~3 mags at 800 nm. BESSEL's capability to produce high Strehls ratios means that the instrument can be used to test the performance of interference/phase coronagraphs on-sky for the first time. Integrated with an optical vortex coronagraph, BESSEL is capable of nulling the first airy ring of Betelgeuse by more then a factor of ten.

Paper Details

Date Published: 15 July 2008
PDF: 12 pages
Proc. SPIE 7015, Adaptive Optics Systems, 70156G (15 July 2008); doi: 10.1117/12.789592
Show Author Affiliations
Mary Anne Peters, Steward Observatory, Univ. of Arizona (United States)
Laird M. Close, Steward Observatory, Univ. of Arizona (United States)
Tom Stalcup, Steward Observatory, Univ. of Arizona (United States)
Matt Rademacher, Steward Observatory, Univ. of Arizona (United States)
Grover A. Swartzlander, College of Optical Sciences, Univ. of Arizona (United States)
Erin L. Ford, College of Optical Sciences, Univ. of Arizona (United States)
Rukiah S. Abdul-Malik, College of Optical Sciences, Univ. of Arizona (United States)


Published in SPIE Proceedings Vol. 7015:
Adaptive Optics Systems
Norbert Hubin; Claire E. Max; Peter L. Wizinowich, Editor(s)

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