METHOD FOR SIMULTANEOUS SPECTRAL FILTRATION OF A PAIR OF LIGHT BEAMS WITH SPECTRUM TUNING Russian patent published in 2020 - IPC G02B30/00 

FIELD: stereoscopy.

SUBSTANCE: invention relates to stereoscopy, specifically to methods of obtaining and recording spectral stereoscopic images of objects. Essence of the invention consists in using a method for simultaneous spectral filtration of a pair of parallel propagating light beams with tuning on a spectrum, consisting in linear polarization of said beams, passing them through an acousto-optic (AO) crystal, in which an acoustic wave of constant frequency is excited, which provides efficient Bragg diffraction of the given spectral component, passing them through an output polariser, crossed with the input polarizer and parallel propagation after filtration. One of the beams to the crystal AO is passed through a trihedral prism of the AO crystal material, the angles of which are such that the beam is efficiently diffracted in the AO crystal, and after AO crystal, said beam is passed through trihedral prism of material AO of crystal, angles of which are such that this beam after prism extends parallel with second beam.

EFFECT: technical result of invention is use of one acoustooptical (AO) crystal of small weight and dimensions, elimination or simplification of forming optical system, solution of problem of mutual synchronization of channels.

3 cl, 1 dwg