激光二极管端面抽运的棒状Yb：YAG激光器

分析了影响激光二极管抽运Yb：YAG激光器调Q效率的参量，推导了激光二极管端面脉冲抽运Yb：YAG晶体的速率方程，解出了双程抽运情况下的净抽运量子产率。利用数值计算方法，模拟了净抽运量子产率与晶体长度，抽运光脉冲宽度等关系，得出晶体长度的优化可以提高Yb：YAG激光器输出效率。计算了词Q Yb：YAG激光器的最大增益、最大储能，分析了放大自发辐射对于Yb：YAG能量存储的影响。同时给出了激光二极管端面抽运调Q Yb：YAG优化设计方法。这些分析和计算为实际器件的研制提供参考。

Study on Diode Laser End-Pumped Yb:YAG Rod Laser

The facts associated with the efficiency of Q- switched Yb∶YAG are overviewed. The rate equation of laser diode end pumped Yb∶YAG is given. The net pumping quantum yield under two-pass end-pumped condition is deduced. With the numerical method,the relationship between the net pumping quantum yield and the length of crystal,the duration of pumping are simulated,and it is concluded that the optimization of the length of crystal is very important for improving the output efficiency of Yb∶YAG laser. The maximum gain, maximum stored energy are also calculated, and the influence on stored energy by amplified spontaneous emission is considered. The optimized design method for Q-switched laser diode end pumped rod Yb:YAG laser is proposed. The analysis and simulation result is helpful for the development of a practical laser system.