Infrared upconversion for astronomical applications.

The performance of an upconversion system is examined for observation of astronomical sources in the low to middle ir spectral range. Theoretical values for the performance parmeters of an upconversion system for astronomical observations are evaluated in terms of the conversion efficiencies, spectral resolution, field of view minimum detectable source brightness, and source flux. Experimental results of blackbody measurements and molecular absorption spectrum measurements using a lithium niobate upconverter with an argon-ion laser as the pump are presented. Estimates are given of the expected optimum sensitivity of an upconversion device that may be built with presently available components.