MIRROR-LENSED OBJECTIVE FOR WORK IN NEAR IR-SPECTRAL RANGE Russian patent published in 2017 - IPC G02B17/08 G02B13/14 

FIELD: physics.

SUBSTANCE: lens contains the first mirror installed in the course of the beam in the form of an off-axis fragment of a concave positive aspherical mirror, the second mirror in the form of a convex negative axisymmetric spherical mirror. Lens compensator with an optical force of 0.6…0.7 of the optical power of the entire lens, consists of the first positive meniscus, the second concave-convex negative lens, the third concave-concave negative lens, the fourth biconvex lens, the fifth concave-convex negative lens disposed on one optical axis displaced with respect to the optical axis lens, on which there are centers of curvature of the first and the second mirrors, and also has a real aperture diaphragm, located on the second mirror. Improving the image quality is carried out within the annular corner field Δω=2° (ω_y0-ω_ymax=6°-8°) in the spectral range (1.50÷1.70) mcm with increased processability.

EFFECT: two-mirror mirror-lens objective with a lens compensator without central screening with enhanced image quality is created.

2 dwg, 1 tbl