| In this paper, Laser diode end-pumped solid laser as the research object, and LD of CW output as pumping source. based on the numerical solving the rate equation, Influence of spatial intensity distribution of pump light on transverse modes distribution in cavity are discussed. above problems are analyzed in two output patterns which are continuous output and pulse output. only TEM00,TEM10 and TEM20 were considered.For cw laser, oscillation of photons is simulated; the modes distribution is obtained by photon numbers of each transverse mode after the output power is controlled. for pulse laser, By the analysis of energy storage and release during the Q-switched process, the algorithm theoretical model of the Q-switched process is built. By computing the total energy of every mode, the transverse modes distribution is obtained.In the simulation process, the ideal Gaussian beam, cylindrical uniform beam and second order flattened Gaussian beam are chosen as the pumped beam source, with pumping power, pumping radius and cavity profile change, the figure of the modes distribution as function of the spatial intensity distribution of pump light are obtained, M 2 factor corresponding to any case is calculated.The calculate results in this paper has some reference value to the Design for laser. Through adjusting the parameters of pump light, the laser beam with better beam quality can be obtained. |
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