THREE-CHANNEL MIRROR-LENS OPTICAL SYSTEM Russian patent published in 2017 - IPC G02B17/08 G02B23/04 

FIELD: physics.

SUBSTANCE: optical system comprises a main concave aspherical mirror, before which the lens component is mounted in the form of a negative meniscus, a lens compensator of the far infrared range is mounted after the main mirror, the first surface of which is a spectro-dividing surface transmitting the far infrared range and reflecting the visible and short infrared range, a doublet lens, general for the visible and short IR ranges, is located so that its front focal plane is shifted against the back focal plane of the lens mirror to obtain the beams with a small angular divergence. A spectro-dividing prism-cube is located behind the general lens, after passing through which the lens for the short IR range and the radiation receiver are mounted. The lens for the visible range and the radiation receiver are mounted after reflection from the spectro-dividing prism-cube.

EFFECT: enhancing the angular field in the item space, increasing the relative hole in each of the channels, and reducing the number of the aspherical surfaces.

1 dwg, 1 tbl