Abstract

Second-harmonic generation energy conversion efficiencies of CO₂ laser radiation as high as 56% have been measured in 2-cm-long AgGaSe₂ crystals with 30-ns pulses. The value of the nonlinear coefficient d₃₆, which best fits the measured data, is (32 ± 4) × 10⁻¹² m/V. Continuous-wave second-harmonic generation in tellurium generated up to 0.27 mW with an efficiency of 6.8(10)⁻⁵. These pulsed and continuous beams were combined to demonstrate heterodyne detection at 4.75 μm, which increased the signal strength of weak signals by at least a factor of 25 over direct detection. Simultaneous heterodyne detection of 5- and 10-μm light is demonstrated by use of both the pump and second-harmonic beams from the cw laser as independent local oscillators.

© 1993 Optical Society of America

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