但是，由于碳化硅材料所具有高硬度、高弹性模量等性质，使碳化硅质反射镜的光学加工难度很大。
But the optical surfacing on SiC mirrors is extremely difficult because of its high hardness and elastic modulus.
光弹性模型中的力学蠕变，伴随着光学效应随时间的变化。
The mechanical creep in photoelastic models is accompanied by a variation with time of the optical effects.
通过弹性和非弹性的碰撞，发射纵波光学声子，半导体中发生准。
Thequasi equilibrium relaxation occurs via elastic and inelastic scattering and the emission of longitudinal optical phonon.
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