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25 August 1993 Infrared imaging using a tip-tilt secondary mirror
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We have recently developed the first adaptive system to utilize a tip-tilt Cassegrain secondary mirror. The system (called FASTTRAC) is also unique since it uses an infrared array to track the brightest speckle of the guide star. FASTTRAC can correct wavefront slope fluctuations at up to 100 Hz closed loop and stabilize image motion to less than 0.1' rms in the focal plane. The system requires an infrared guide star of 8th mag at K (2.2 micrometers ). The resulting 54 X 54' images show improvements of up to approximately 300% in resolution (FWHM) when tracking the brightest speckle of the infrared guide star.
© (1993) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Laird Miller Close and Donald W. McCarthy Jr. "Infrared imaging using a tip-tilt secondary mirror", Proc. SPIE 1920, Active and Adaptive Optical Components and Systems II, (25 August 1993);

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