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①引言双折射反应了光盘注塑模压工艺引入的内应力,利用光学的方法检测,是衡量基片光学性能的重要参数。由于介质的折射率不同,光在不同介质中传播速度也不同,当一束光从由介质1进入介质2时,在界面处发生反射和折射。光束在通过各项异性的介质时,分解成两束偏振方向正交的折射光(寻常光和非常光,o光和e光),这种现象称为双折射。材料的各向异性由内应力引起,因此通过测量双折射,就可反映材料在加工、处理(热、机械)过程中的应力。
① Introduction The birefringence reflects the internal stress introduced by the optical disc injection molding process. It is an important parameter to measure the optical performance of the substrate by the optical method. Due to the different refractive index of the medium, light propagates at different speeds in different media. When a beam of light enters the medium 2 from the medium 1, it is reflected and refracted at the interface. When the light beam passes through the anisotropic medium, it is decomposed into two beams of refracted light (ordinary light and extraordinary light, o light and e light) orthogonal to the polarization direction. This phenomenon is called birefringence. The anisotropy of the material is caused by the internal stress, so by measuring the birefringence it reflects the material’s stress during processing and handling (thermal, mechanical).