对Cr4+∶YAG晶体作为1064nm激光的可饱和吸收体进行了研究。利用速率方程,描述了强激光下晶体的激发态吸收;ESA)的动力学过程。用实验验证了所导出的光强与透过率的理论曲线,并因此论证了可以利用晶体的激发态吸收进行激光调Q,并对其进行优化。

Cr4+∶YAG is studied as a saturable absorber of 1064 nm laser. The dynamic process of excited state absorption (ESA) is described by using rate equations, with the crystal interacting with low or high power laser. The function about intensity varying with the transmission derived by rate equations is demonstrated by experiment. Therefore, it is shown that the Q switching is possible and can be optimized by using the ESA of the crystal.