四能级激光器 meaning in English

four level laser
four lever laser
four-level laser

First , some principle that should be considered in building a laser cavity was discussed based on the rate equation of four - level laser model . then , the thermal lens effect of nd : yvo4 crystal was analyzed and estimated theoretically . the laser cavity was designed by considering the thermal lens effect and the optimal transmission was estimated
首先在理论上通过四能级激光器速率方程，讨论了激光器设计上需要注意的一些原则，然后分析了nd ： yvo _ 4晶体的热透镜效应，理论上估算了其热焦距的大小，并且在腔型设计中给予了考虑。