The Contrastive Study Of Green Laser Using Hydrothermal And Flux Grown KTP

Laser diode-pumped solid-state lasers (DPSSL or DPL) have become a developing focus of novel solid-state lasers and have wide applications in material processing,military,medical therapeutics and basic research, et al, due to their advantages,such as high efficiency,compactness,steadiness,long lifetime and all solid-state construction.This dissertation has made systematically theoretical and experimental contrast research on using the LD to pump the Nd:YVO₄ and Nd:GdVO₄ laser crystals, the nonlinear optical crystal hydrothermal grown KTP and flux grown KTP are used as intracavity double frequency crystal, stable continuous-wave output at 532nm green laser is obtained. Observed the hydrothermal grown KTP crystal with electron microscope, investigated the defects in the hydrothermal grown KTP crystal, and analyzed the reasons of formed the defects, laid a foundation for growing the higher optical quality hydrothermal KTP. In the paper we programmed and computed the relation of doubled efficiency and temperature of two KTP with MATLAB, in order to compare with the two doubled crystals, we have selected the optimization control temperature. Obtained the optimization resonant parameters by analyzing the thermal focal lens of the Nd:YVO₄ and Nd:GdVO₄ laser crystals and using the ABCD matrix. By systematically theoretical and experimental research, at 6.11W pumped power, stable continuous-wave output 532nm green laser had obtained: the output green power was 927mW with Nd:YVO₄/KTP(hydrothermal grown);862mW with Nd:YVO₄/KTP(flux grown);700mW with Nd:GdVO₄/KTP(hydrothermal grown);630mW Nd:GdVO₄/KTP(flux grown), and the optical-optical conversion efficiency are 15.2%,14.1%,11.5%,10.3%, and analyzed the experiment results of these lasers by comparison.