Abstract

Gallium selenide has been used as a frequency doubler for the output of a high-power, short-pulse, mid-infrared free-electron laser. Internal conversion efficiencies up to 36% have been achieved in the wavelength range from 6.3 to 12 μm. The second-harmonic output was stable over many hours at peak power levels of 1– 2 MW.

© 1996 Optical Society of America

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