Research On High-power Green Laser Based On Intracavity Frequency Doublin

Visible lasers are used increasingly in processing industries,scientific research,medical and detection fields,and all-solid-state lasers combine the advantages of semiconductor and solid-state lasers:long lifetime,compact structure,stable output,etc.Therefore,all-solid-state green lasers with high conversion efficiency and high power output have become one of the popular research fields in recent years.This paper aims to design a continuous-wave all-solid-state green laser for industrial applications.The theoretical analysis and experimental study of a direct end-pumped Nd:YVO₄/LBO intracavity frequency-doubled 532 nm green light output from a semiconductor laser are carried out to obtain a stable output of continuous-wave green light.The main contents of the paper can be summarized as follows.1.In this paper,the development history,research status and application prospects of LD-pumped all-solid-state lasers are firstly reviewed systematically,and the purpose and significance of this topic are indicated.The output characteristics of the resonant cavity are analyzed theoretically from the four energy level rate equation of the gain crystal.The thermal effect of the working material in the resonant cavity is analyzed and simulated by using COMSOL software and heat conduction theory,and the influence of structural parameters on the output performance of the resonant cavity is analyzed theoretically.2.A compact all-solid-state green laser pumped by a single light-emitting unit LD is proposed with the aim of providing an efficient,reliable and compact green light source.An all-solid-state continuous green laser based on a combination of Nd:YVO₄/LBO crystals is proposed in a flat-concave cavity structure with an 808 nm single light-emitting unit semiconductor laser in an F-mount package as the pump source,using a fiber core 105μm（this size is ignorable with respect to the module volume）fiber column lens to compress the spot in the fast axis direction of the pumped light and then coupled in a direct end-face pumping The Nd:YVO₄ gain crystal is used to generate 1064 nm oscillating light,and the LBO crystal is used to multiply the oscillating light intracavity to generate 532 nm green light.The experimental results show that when the pumping power is 7.5 W,a continuous green light output power of2.53 W is obtained,corresponding to an optical-optical conversion efficiency of 33.5%.3.One 532 nm solid-state green laser,one 450 nm semiconductor blue laser and two 650 nm semiconductor red lasers were mixed into white light using fiber bundling method and prepared into a white light module with a power mixing ratio of R:G:B=1:0.94:0.54.Finally,a combination of turbo cooling fan and TEC cooler was used for green light module and white light module for The temperature control experiment successfully controls the temperature of the white light module and the green light module,reducing the requirement for water cooling and making the module more convenient for practical applications.