The Experiment of Q-Switched Nd~(3+)∶YAG Laser Based on the Crystal Electro-Optic Effect

In order to investigate quantitatively the application of electro-optic Q-Switch composed of polarizing plate and KD*P crystal to Nd3+∶YAG laser.The basic principle and method of Q-switched Nd3+∶YAG laser to crystal electro-optic effect were illuminated firstly.Based on the rate equation of Q-switched laser,the output energy and pulse width were analyzed.The results illustrate that the reversal particle density is important to improve the quality of Q-Switched pulsed laser output.The apparatus of Nd3+∶YAG laser with Q-switched,Mode-locking,Frequency doubling and laser magnifying is established ultimately.Experiments and analysis on laser impulse width and laser output energy were conducted befor and after Q-Switch.The experiments system was divided into two levels:latent level and magnifying level,which yielded high peak power realized through compressing the laser pulse width less than 20 ns.Furthermore,the laser output energy is increased to 500 mJ.