High-Efficiency Parametric Light Amplifier With Injection Of The Initial Signal

A highly efficient parametric superluminescence light amplifier on a KDP crystal with an aperture of 50 x 50 mm is described. The initial radiation is injected from a LiF: F(2)(-)color-center laser. The parametric amplifier is pumped by the third harmonic of a high-power neodymium laser. The maximum efficiency of the pump energy conversion into parametric waves (67%) is attained, owing to special profiles of the interacting beams, by using a system for automatic control of the beam spatial profile based on a photosensitive charge-coupled device. The energy of parametric waves tunable within ranges of 1.09-1.21 and 0.494-0.518 mu m is 0.66J, with the diffraction-limited divergence and spectrum width of 0.06 Angstrom.