作为光透性胶粘剂，必须均匀，对光具有低的吸收，和被粘接材料的折射率相当。
The transparent adhesive must be homogeneous and low in absorption of light, and its refrangibility must be same as that of the material to be bonded.
且各级衍射光的偏振度随着透振方向的改变而发生周期性的变化。
At the same time, degrees of polarization (DOP) of every diffraction order periodically alter with change of polarization orientation.
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