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15 July 2008 A high-Strehl low-resolution optical imager (BESSEL): a measurement of the inner scale of turbulence
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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.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Mary Anne Peters, Laird M. Close, Tom Stalcup, Matt Rademacher, Grover A. Swartzlander, Erin L. Ford, and Rukiah S. Abdul-Malik "A high-Strehl low-resolution optical imager (BESSEL): a measurement of the inner scale of turbulence", Proc. SPIE 7015, Adaptive Optics Systems, 70156G (15 July 2008); doi: 10.1117/12.789592;


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