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Active optical compensation of low-quality optical system aberrations

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Abstract

We describe a method for the correction of slowly varying wavefront aberrations of low-quality telescope mirrors by using a DM in an active optical compensation system. Our goal is to reduce the surface wavefront error of low-cost multimeter-diameter mirrors from approximately 10 waves peak-to-valley (P–V), at a 1μm wavelength, to approximately 1 wave or less. In a proof-of-concept demonstration using a 0.3m telescope at a wavelength of 633nm, the rms wavefront error improved to 0.05 waves (0.26 waves P–V) from the original value of 1.4 waves rms (6.5 waves P–V). The Strehl ratio improved to 89% from the original value of 0.08%. The types of aberrations corrected include astigmatism, coma, defocus, trefoil, and higher-order aberrations.

© 2006 Optical Society of America

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