Simulation And Experimental Study Of Thulium-doped Solid-state Laser

2μm thulium laser wavelength has a good prospect in laser radar, laser ranging, laser medical and other fields. The upper level of thulium laser has a long life. Compared with thulium-doped fiber laser, Q-switched solid-state Tm:YAG laser is easier to get a strong pulse energy and it is of great significance to the hard tissue in minimally invasive surgery during thulium laser ablation and laser detection applications.This paper focuses on high efficiency,high power Tm:YAG laser research. Fist according to Tm:YAG crystal energy level structrure analyze Tm:YAG laser operating characteristicws of quasi-three level, build the laser rate equations. By simulating laser energy levels during operation and variation of laser resonant cavity photon number analyze the influence of output because of the conditions of input and cooling. The results show that the cooling temperature of the laser output produce a huge impact. Appropriately reduce the cooling liquid temperature can improve the efficiency of the laser. By Q-rate equation simulate pulse characteristics of the laser, obtain a intense pulse of solid Tm:YAG laser.Because of the effect of temperature on the laser output power and in order to prevent the condensation of water vapor at both ends of the Tm:YAG crystal, put forward innovative design of heating sleeve at the ends of the crystal during reducing the cooling temperature. Establish a three-terminal side-pumped solid Tm:YAGlaser temperature and stress mathematical model, using the finite difference method to analyze Tm:YAG temperature and stress distribution of mathematical simulation, analyze the temperature, stress and thermal lens effect in pump power and pump coupling structure, discuss the effect of reducing the thermal method to provide a theoretical basis for further experiments.Based on the theoretical analysis, design the laser experimental system for continuous laser output experiment. Study Tm:YAG laser output law and the influence of various parameters on the laser output during the different pump power, cooling water temperature and output transmission conditions. In the conditions of pumping laser power of 765 W, realize continuous laser output power 178 W, optical conversion efficiency of more than 22% and lay a foundation for further research pulsed laser.