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利用折射率椭球分析法,分析了某些具有多重光学效应的光学晶体在两个外场同时作用下的一些特有调制规律.结果表明,当晶体的折射率椭球方程的三个交叉项中只有一项x1x2不为零时,可以得到其外场诱导新主轴折射率及其主轴取向的简单计算式.据此可以揭示出某些晶体在两个外加电场同时作用下将具有双横向电光Pockels效应,例如ˉ6点群的电光晶体.但一般晶体在双横向应力作用下不具有与双横向电光效应类似的调制特性,其弹光双折射大小与其应力差成正比,其双折射主轴方向一般为固定值.在相互垂直的外加应力和电场同时作用下,某些晶体(例如ˉ43m点群晶体)的双折射大小与外加应力和外加电场的加权几何平均值成正比,且新折射率主轴旋转角由外加应力和外加电场的比值来确定.晶体的上述双参量调制特性对设计新型光学调制器或传感器具有重要指导意义.
Some special modulation laws of some optical crystals with multiple optical effects under the simultaneous action of two external fields are analyzed by means of the refractive index ellipsoid analysis.The results show that when only the three cross terms of the refractive index ellipsoid equation When x1x2 is not zero, we can get a simple formula for the induction of the new spindle’s refractive index and its principal axis orientation in the outfield, which shows that some crystals will have double transverse electro-optic Pockels effect under the simultaneous application of two external electric fields, Such as ˉ 6 point group of electro-optic crystal.But the general crystal under the double transverse stress does not have the same horizontal and double electro-optic modulation properties, the size of the elastic birefringence and its stress is proportional to the birefringent principal axis direction is generally fixed At the same time, the birefringence of some crystals (such as ˉ43m point group crystal) is directly proportional to the weighted geometric mean values of applied stress and applied electric field under the simultaneous action of applied stress and electric field perpendicular to each other, and the rotation angle of the new index of principal axis Stress and the ratio of applied electric field to determine the crystal of the above two-parameter modulation characteristics of the design of new optical modulator or sensor has an important guide Meaning.