METHOD OF DETERMINING ORIENTATION OF CRYSTALLOGRAPHIC AXES IN CLASS 3m ANISOTROPIC ELECTRO-OPTICAL CRYSTAL Russian patent published in 2014 - IPC G01N21/21 

FIELD: physics, optics.

SUBSTANCE: invention relates to optical instrument-making and a method of determining the orientation of crystallographic axes in a class 3m anisotropic electro-optical crystal. The method is carried out using an optical system comprising a radiation source, a polariser, the analysed crystal, an analyser crossed with the polariser, a screen and an electrostatic field source. Divergent monochromatic radiation is transmitted through the optical system and a first picture is obtained on the screen in the form of a dark "Maltese cross". An electrostatic field is applied to the analysed crystal and a second picture is obtained in the form of two hyperbolic lines. The crossed analyser and polariser are synchronously turned until a third picture is obtained on the screen in the form of a dark cross and then in the form of two dark hyperbolic lines. The arrangement of the axes is determined depending on the angle between the projection of the line joining the vertices of the hyperbolic lines and the perpendicular to the entrance face of the crystal.

EFFECT: determining mutual arrangement of all crystallographic axes without using expensive equipment.

1 dwg, 1 tbl