BRIEF COMMUNICATIONS: High-efficiency conversion of infrared into visible radiation in an LiNbO3 crystal
An investigation was made of the conversion of infrared into visible radiation in an LiNbO3 crystal. This was done by mixing infrared radiation with that produced by a pulse ruby laser. Infrared radiation of wavelengths 1.6-3 μ was converted by the ooe interaction using different phase-matching angles. A quantitative dependence of the converted-radiation power on the laser pump power was obtained. The converted-radiation power reached saturation for a pump power density of 5 MW/cm2 when the phase-matching angle was 90° and the conversion took place in a 2-cm long crystal.