HOLOGRAPHIC DEVICE FOR SHAPE CONTROL OF ASPHERICAL OPTICAL SURFACES Russian patent published in 2022 - IPC G01B11/30 G01M11/02 

FIELD: aspherical optical surfaces.

SUBSTANCE: invention can be used to control the shape of aspherical optical surfaces (AOP). The holographic device contains a laser light source, a light beam expander, a beam splitter, measuring and reference channels, and an image registration and processing channel. The reference channel contains a flat mirror, and the measuring channel contains an axial synthesized hologram optical element (ASHOE) and a lens that forms a monochromatic point light source on the optical axis at a given distance from the top of the controlled AOP. ASHOE is a hologram reflective autocollimation compensator with a central hole. The current radius of the coaxial annular diffractive structure of the ASHOE ρ is calculated taking into account the condition: 2sinϕ(ρ)=λν(ρ), where ϕ(ρ) is the angle between the light beam incident on the ASHOE and the normal to its working surface in the zone with the current radius ρ; λ is the wavelength of a monochromatic point light source; ν(ρ) is the spatial frequency of ASHOE in the zone with current radius ρ.

EFFECT: increasing the sensitivity of the control of the shape of the AOP with the exclusion of the distorting influence of the ASHOE on the form of interference and shadow patterns obtained in the process of control.

6 cl, 9 dwg