SYSTEMS AND METHODS FOR DIGITAL LASER PROJECTION WITH ENHANCED CONTRAST, USING FOURIER FILTER Russian patent published in 2022 - IPC G02B27/46 

FIELD: laser equipment.

SUBSTANCE: invention relates to laser projection systems. The system contains a spatial light modulator configured to modulate a light signal with formation of a repeated sequence of the first, the second, and the third modulated light signals; a lens configured for spatial Fourier transform; and a disc with light filters, located on the Fourier plane and containing a set of optical filter masks. Each mask filters one of the first, the second, and the third modulated light signals by passage of at least one diffraction order of a corresponding one of the first, the second, and the third modulated light signals and blocking of the rest part of the corresponding one of the specified signals. The disc with light filters is configured so that to rotate synchronously with the modulated light signal, so that each mask is located in the modulated light signal with time multiplexing on the Fourier plane, where the modulated light signal is the corresponding one of the first, the second, and the third modulated light signals.

EFFECT: increase in a contrast coefficient.

32 cl, 38 dwg