11 February 2003 High-order adaptive optical system for Big Bear Solar Observatory
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Abstract
We present a high-order adaptive optical system for the 26-inch vacuum solar telescope of Big Bear Solar Observatory. A small elliptical tip/tilt mirror is installed at the end of the existing coude optical path on the fast two-axis tip/tilt platform with its resonant frequency around 3.3 kHz. A 77 mm diameter deformable mirror with 76 subapertures as well as wave-front sensors (correlation tracker and Shack-Hartman) and scientific channels for visible and IR polarimetry are installed on an optical table. The correlation tracker sensor can detect differences at 2 kHz between a 32×32 reference frame and real time frames. The WFS channel detects 2.5 kHz (in binned mode) high-order wave-front atmosphere aberrations to improve solar images for two imaging magnetographs based on Fabry-Perot etalons in telecentric configurations. The imaging magnetograph channels may work simultaneously in a visible and IR spectral windows with FOVs of about 180×180 arc sec, spatial resolution of about 0.2 arc sec/pixel and SNR of about 400 and 600 accordingly for 0.25 sec integration time.
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Leonid V. Didkovsky, Leonid V. Didkovsky, Alexander Dolgushyn, Alexander Dolgushyn, William Marquette, William Marquette, Jeff Nenow, Jeff Nenow, John Varsik, John Varsik, Philip R. Goode, Philip R. Goode, Steven L. Hegwer, Steven L. Hegwer, Deqing Ren, Deqing Ren, Steve Fletcher, Steve Fletcher, Kit Richards, Kit Richards, Thomas Rimmele, Thomas Rimmele, Carsten J. Denker, Carsten J. Denker, Haimin Wang, Haimin Wang, } "High-order adaptive optical system for Big Bear Solar Observatory", Proc. SPIE 4853, Innovative Telescopes and Instrumentation for Solar Astrophysics, (11 February 2003); doi: 10.1117/12.471341; https://doi.org/10.1117/12.471341
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