Abstract
A general equation describing the rotation of an optical indicatrix of tetragonal crystals (4, 4¯, 4/m symmetry classes) around the X3 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 X1 (X2) axis or along the diagonal between the X1 and X2 axes, are received. The values of piezo-optic coefficients (POCs) π61, π16, and π45 are determined by the conoscopic method on the basis of the appropriate equations. Other POCs πim are determined by the interferometric method. All components of the matrix of elasto-optic coefficients are also determined as pin=πimCmn. These results are being compared to the ones received on the basis of wave-mechanical calculations. Objective pin 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.
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