title: Frequency doubling of mid-infrared radiation in gallium selenide.
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 microm. The second-harmonic output was stable over many hours at peak power levels of 1-2 MW.
authors.forename: J M
authors.initials: JM
authors.lastname: Auerhammer
authors.forename: E R
authors.initials: ER
authors.lastname: Eliel