Optimizing the process of generating the second harmonic of the radiation of a TEA CO2 laser in a ZnGeP2 crystal

摘要

The creation of a high-intensity source in the 4.6-5.4-μm range is a problem that has attracted the attention of researchers for several decades. This paper describes the optimization of the process of generating the second harmonic of the radiation of a pulse-periodic TEA CO2 laser by choosing a nonlinear crystal and the temporal shape of the laser-pump pulse. Energy-conversion efficiency of up to 20 has been experimentally obtained in a ZnGeP2 crystal with mean power of the radiation in the λ = 4.8 um region of up to 0.24 W and a pulse repetition rate of 10 Hz.