In the end-pumped system, the influence of initial photon number transverse modes distribution of oscillating light on the stability of output pulse is studied. By the analysis of energy storage and release during the Q-switched process, the algorithm theoretical model of the Q-switched process is built, in the simulation process, the ideal Gaussian beam, cylindrical uniform beam and second order flattened Gaussian beam are chosen as the pumped beam source, when pumping power, pumping radius and repetition rate are changed, the figures of the output pulse peak power and pulse width will be obtained, then we can study the influence of initial photon number transverse modes distribution of oscillating light on the stability of output pulse.Based on the numerical results, it can be predicted that when the initial photon number transverse modes structure of oscillating light is changed randomly, the output pulse peak power and pulse width are changed too, the pulse is unstable. The three pumping beam are compared with each other, when the pumping beam is the ideal Gaussian beam, the output energy of TEM00 mode is the largest, and the beam quality of the facula is the best. The greater the pumping radius is, the greater the fluctuation of output pulse peak power caused by the fluctuation of oscillating light initial photon number mode distribution will be; when the pumping beam is the ideal Gaussian beam or second order flattened Gaussian beam, the greater the pumping power is, the greater the fluctuation of output pulse peak power caused by the fluctuation of oscillating light initial photon number mode distribution will be, and the greater the repetition rate is, the smaller the fluctuation of output pulse peak power caused by the fluctuation of oscillating light initial photon number mode distribution will be. Experiments are done by using the flattened Gaussian beam as the pumped source, the experimental results coincide with the numerical results. |