Study On Multi-wavelength Electro-optic Q-switched Pulsed Nd:YAG Laser

In this paper, a multi-wavelength electro-optic Q-switched pulsed Nd:YAG laser has been developed. In this system, a type of electro-optic Q-switch of an multifunctional artificial crystal Langasite(La₃Ga₅SiO₁₄,LGS) is used on the two operation modes of retreat pressure circuit and pressure circuit. On the pressure circuit mode, the laser pulse width is 14.7 ns . the average peak power is 50MW/cm². And on the same operation mode, these parameters of out put laser are compared with the corresponding parameters when the electro-optic Q-switch of KD P is employed. The differences of performance of these two electro-optic Q-switches have been obtained. The dynamic to static ratio of LGS is higher than that of KD P. LGS has more advantages when the pressure circuit mode is employed . A set of systematic test data has been provided for the development and application of Langasite crystal. On the basis. 355nm ultraviolet pulsed laser has be obtained by a new nonlinear Bismuth Triborate (BIBO) crystal sum frequency of Nd:YAG 1064 nn fundamental frequency laser and 532 nm double frequency laserwhen the II type of phase matching angle is 71.8°. So the three wavelength laser have been achieved.