DIFFRACTION OPTICAL ELEMENT Russian patent published in 2023 - IPC G02B27/42 G02B5/18 G01J3/18 

FIELD: optoelectronic instrumentation.

SUBSTANCE: optical element base of optoelectronic instrumentation. Invention can be used as the main dispersive element of spectral devices with crossed dispersion. The claimed diffractive optical element contains a substrate with an opaque working layer on which the main reflective line structure is made, which is a line structure of an echelle diffraction grating, and an additional line structure formed perpendicular to the main reflective line structure. The additional groove structure is a transmission diffraction grating with triangular grooves, made on an additionally introduced transparent layer 20-70 mcm thick, located above the main reflective groove structure.

EFFECT: increased spectral characteristics of the diffractive optical element of cross-dispersion spectral instruments, namely, the diffraction efficiency in high orders of diffraction at a wavelength of 350 nm increases by approximately 14.3% (from 35% to 40%), light scattering changes from 5×10^-4 to 1×10^-4 relative to the intensity of the main line, and the resolution is increased by 20%.

1 cl, 2 dwg