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Based on the energy-level structure of quasi-three-level Yb ion,an amplified spontaneous emission model in pumping process is set up. The stored energy density distribution and the energy that can be extracted in Yb:YAG crystal are calculated. Our calculation,which is based on the laser rate equations and the theory of anglular spectrum propagation,can simulate time-resolved evolution of the spatial intensity distribution and M2 factor of the laser pulses. At the same time,an experiment in laser diode-pumped Q-switched rep-rated Yb:YAG disk laser was performed. This model was proved to be correct by comparing the results of the experiment and calculation,which will be helpful in designing active Q-switched solid laser.
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Keywords:
- Yb:YAG laser /
- Q-switched /
- spatio-temporal dynamics
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