【摘要】 本文利用投影法、光学傅里叶频谱分析法和纹影法,对静电场作用下α-碘酸锂单晶的透射光场异常分布作了进一步观察。考察了z-切样品的透射光场的空间频谱随电压升高而改变的情况。利用高通滤波器进行滤波,观察到晶体的透射光的衍射效率与外加电压成线性关系,并与电场方向和晶体电正极面之相对取向有关,但是不依赖于入射光的偏振状态。消光比的测量表明,静电场的作用不改变光的偏振态。定量地记录了衍射效率随时间变化的弛豫过程。更多还原

【Abstract】 The abnormal phenomena in the transmitted light passing through a-LiIO₃ single crystals under the application of a DC field parallel to the c-axis have been further investigated by means of the direct projection method, the optical Fourier transfor-mation method and the Schlieren method. The change in the spacial frequency spectrum of a z-cut crystal plate with the increase of the applied field intensity was examined. It was observed that the diffraction efficiency of the transmitted light shows a linear dependence on the applied voltage, but is independent of the polariza-tion of the incident light. It was also found that the light polarization is not changed by the action of the DC field and the effect of absorption is negligible. The relaxa-tion process of the change in diffraction efficiency with time was recorded quantita-tively. A tentative explanation of these phenomena has been given.更多还原