Solid laser is a four-level system.
固体激光器是一个四能级系统。
The rate equations for a continuous four level laser are solved in this letter, taking into account the finite lower level lifetime and the crystal field splitting of the laser levels.
在考虑了有限的下能级寿命和激光能级与晶格场的相互作用的基础上，对四能级激光的速率方程组进行了求解。
The time characteristics of a pulsed ti: sapphire laser have been studied theoretically based on the rate equation of four-level system.
本文从四能级结构激光速率方程出发，对脉冲掺钛蓝宝石激光器的时间特性进行了理论研究。
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