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受抑全内反射（ＦｒｕｓｔｒａｔｅＴｏｔａｌＩｎｔｅｒｎａｌＲｅｆｌｅｃｔｉｏｎ；简称ＦＴＩＲ）Ｑ开关是一种有诸多优点的Ｑ开关，它由两个相对棱镜组成，通过快速改变两棱镜之间的空气间隙来抑制全内反射，从而改变激光腔内的损耗．计算和实验表明，只有当两棱镜的间距
Frustrated Total Internal Reflection (referred to as FTIR) Q switch is a Q switch with many advantages, which consists of two opposing prism, by rapidly changing the air gap between the two prisms to suppress total internal reflection, thereby changing the laser Cavity loss. Calculations and experiments show that only when the distance between two prisms