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 LiNbO<sub>3</sub> 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
Christopher D. Brewer, Peter E. Powers, Sean M. Kirkpatrick, and Edward A. Watson, "Enhanced Signal Coupling into Periodically Poled Lithium Niobate with Microlens Arrays," Appl. Opt. 41, 4411-4415 (2002)