Theoretical Anaysis Of Yb:YAG Microchip Laser Performance

Laser performance of Yb:YAG microchip was analyzed theoretically according to laser physics theory in this dissertation. Analytical analysis and numerical simulation results were in good agreement with the conclusions of the authority, and had guiding significance for forecast evaluation of properties of laser devices, especially new materials laser, and improvement of the experiment. The details are as follows:Threshold expression was obtained by theoretical analysis of the system starting from the laser rate equations, and taking the impact of reabsorption of the ground state of Yb3+ ions into account.Stimulated emission cross sections of Yb:YAG crystal (laser wavelength is 1030nm) at different temperature were calculated under the joint actions of temperature-dependent emission cross-section, concentration-dependent fluorescence lifetime and thermal lens effect. The results allow us more flexibility in selection of concentration and temperature in the laser design.The optimized laser operation for Yb:YAG microchip lasers was proposed by numerical simulation and variation of the thickness and output coupling for different Yb concentrations on the basis of theoretical analysis.