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Enhanced signal coupling into periodically poled lithium niobate with microlens arrays

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Abstract

The return signal frequency of an eye-safe ladar system is upconverted from the infrared to the visible through sum-frequency generation by incorporation of periodically poled LiNbO3 into the receiver. A quantitative analysis of the angular acceptance and the quantum efficiency is then presented for a single macroscopic receiver optic and a multiaperture microlens array. Comparing both results, a 6× increase in the receiver field of regard and an 18% increase in beam coupling were realized for the microlens design over the macroscopic system.

© 2002 Optical Society of America

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