A detailed investigation of frequency doubling of a transversely excited atmospheric CO<sub>2</sub> laser operating at 9.55 μm with a CdGeAs<sub>2</sub> crystal was carried out. The temperature of the crystal was varied between 80 and 295 K to maximize the frequency-doubled energy. The temporal shape of the generated beam at 4.775 μm was monitored to calculate its peak power. High values of midwave infrared pulse energy (16.65 mJ) and peak power (92 kW) were obtained, which can be of potential use in lidar systems.
© 2002 Optical Society of America
Andrew Zakel, James L. Blackshire, Peter G. Schunemann, Scott D. Setzler, Jonathan Goldstein, and Shekhar Guha, "Temperature and Pulse-Duration Dependence of Second-Harmonic Generation in CdGeAs2," Appl. Opt. 41, 2299-2303 (2002)