Cleanup of Nd:YAG laser beams by two-wave mixing in InP:Fe

摘要

Abstract: ave mixing experiment using a Nd:YAG laser, operating at 1064 nm, and a photorefractive InP:Fe crystal resulted in a gain coefficient $Gamma of 17 cm$+$MIN@1$/ and a signal gain $gamma of 15. In the case of a $pi@/2 spatial phase shift between the light interference fringes and the refractive index grating, phase cross talk is eliminated. Amplitude cross talk can be eliminated using volume hologram averaging of the beams. With this scheme a weak Gaussian beam is amplified by a pump beam containing strong phase and amplitude aberrations. Energy efficiencies of 27% were obtained under preservation of the nearly diffraction limited beam shape. !25