A general equation describing the rotation of an optical indicatrix of tetragonal crystals (4, (4) over bar, 4/m symmetry classes) around the X-3 axis (optical axis) depending on the direction of uniaxial pressure in the plane perpendicular to crystal optical axis is written. Partial cases of the general equation, when pressure is acting along the X-1 (X-2) axis or along the diagonal between the X-1 and X-2 axes, are received. The values of piezo-optic coefficients (POCs) pi(61), pi(16), and pi(45) are determined by the conoscopic method on the basis of the appropriate equations. Other POCs pi(im) are determined by the interferometric method. All components of the matrix of elastooptic coefficients are also determined as p(in) = pi C-im(mn). These results are being compared to the ones received on the basis of wave-mechanical calculations. Objective p(in) values are necessary to build indicative surfaces of the elasto-optic effect and to find maximums of these surfaces and appropriate maximum values of acousto-optic quality coefficients. (C) 2016 Optical Society of America
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机译：一个通用方程，描述了四方晶体（4，（4）在bar上，对称度为4 / m对称）上的四边形晶体的光学指标围绕X-3轴（光轴）的旋转，具体取决于垂直于该平面的平面中的单轴压力方向晶体光轴被写入。当压力沿X-1（X-2）轴或X-1和X-2轴之间的对角线作用时，会收到一般方程的部分情况。压电系数pi（61），pi（16）和pi（45）的值是根据适当的公式通过锥镜法确定的。其他POC pi（im）通过干涉法确定。弹性系数矩阵的所有分量也确定为p（in）= pi C-im（mn）。将这些结果与根据波浪力学计算得到的结果进行比较。目标p（in）值对于建立弹性光效应的指示表面以及找到这些表面的最大值和声光质量系数的适当最大值是必需的。 （C）2016美国眼镜学会
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