HIGH-EFFICIENCY PARAMETRIC LIGHT AMPLIFIER WITH INJECTION OF THE INITIAL SIGNAL

A highly efficient parametric superluminescence light amplifier on a K DP crystal with an aperture of 50 x 50 mm is described. The initial ra diation is injected from a LiF: F(2)(-)color-center laser. The paramet ric amplifier is pumped by the third harmonic of a high-power neodymiu m laser. The maximum efficiency of the pump energy conversion into par ametric waves (67%) is attained, owing to special profiles of the inte racting beams, by using a system for automatic control of the beam spa tial profile based on a photosensitive charge-coupled device. The ener gy 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 spectru m width of 0.06 Angstrom.