四镜 meaning in Chinese

the four resemblances between a mirror and the bhūtatathatā in the awakening of faith

Four - mirror ring cavity and six - mirror ring cavity has its advantages and shortcomings , respectively
四镜环形谐振腔和六镜环形?振腔有各自的优点和不足。
The optimum position of focal spot of pumping laser through coupling system is calculated . in the fifth chapter , the optical characteristics of nd : yvo4 and lbo are studied . the astigmatism problem of resonant cavity is explored thoroughly under the condition of thermal lens effect
第五章分析了nd ： yvo _ 4和lbo晶体的光学特性，深入分析了在引入热透镜效应的情况下谐振腔的像散问题，设计了四镜z型折叠腔，应用abcd定律计算优化选择了一组腔参数。
2 . we design a configuration of frequency - doubler according to the optimum focus condition and the cavity stability condition | a + d | < 2 and optimize it based on " mode - matching " and " optimum coupling " . 99 . 96 % of optical impedance - match efficiency and over 95 % of spatial mode - matching efficiency are achieved eventually by using t = 10 % of input coupler in our experiment
( 2 )根据最佳聚焦条件和腔的稳定性条件( | a + d | 2 )对四镜环型倍频腔进行了设计，并分别从“模式匹配”和“最佳输入耦合镜透射率的选择”两方面着手对腔进行优化，在我们的实验中采用10的输入耦合镜，获得阻抗匹配效率为99 . 96 ，空间模式匹配效率高于95以上的模式。