METHOD FOR REFLECTING LASER BEAMS MAINTAINING THE POLARISATION AND REFLECTOR BASED THEREON Russian patent published in 2021 - IPC G02B5/08 G02F1/01 

FIELD: optics.

SUBSTANCE: invention relates to the field of optical instrument manufacture and pertains to a method for reflecting a laser collimated beam. When implementing the method, the laser beam falls at an acute angle α on a flat polished section of the surface of a birefringent crystal with such an orientation of the crystal and physical axes that the α-dependent Fresnel power reflection coefficients R_s and R_p of the orthogonally polarised s- and p-components of the radiation would be equal for this crystal and this orientation. All surfaces of the crystal except for one polished surface are made rough, and the dimensions of the crystal and the shapes of the rough surfaces are selected so that the intensity of the radiation scattered and reflected therefrom in the direction of the beam reflected from the polished surface would be so small that the polarisation state of the beam reflected from the polished surface would not be distorted.

EFFECT: ratio of the powers of the plane-polarized s- and p-components of the initial radiation in the reflected beam remains unchanged at a large angle of incidence.

4 cl, 4 dwg