Low Light Adaptive Correction in Support of the Space Situational Awareness Mission (DCT-FY08)
Final rept. 1 Mar 2003-30 Nov 2010
HAWAII UNIV HONOLULU
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Numerous wavefront sensing approaches are used in current adaptive optics systems. Each of these has features that make each attractive under certain situations. Roddier curvature RC adaptive optics systems use a sensor that measures the second derivative of the wavefront phase. Its use is common in astronomical adaptive optics systems and it has two key advantages 1 a minimum number of sensors is required per wavefront sensor subaperture allowing the use of photon-counting devices and operations in very low-light level and 2 an optical gain within the wavefront sensor that allows the wavefront sensor to be tuned to existing turbulence conditions. A key question for RC adaptive optics systems is whether they remain compelling in the low-light level regime as the number of subapertures increases. This was the main avenue of study for this program.