ACHROMATIC CATADIOPTRIC LENS Russian patent published in 2016 - IPC G02B17/08 

FIELD: optics.

SUBSTANCE: invention can be used in optical systems operating in a wide spectral range. Catadioptric lens comprises at input an afocal compensator with near-zero optical power, consisting of inverted concavity to object of negative meniscus positive lens made of same material, and at output - a second negative two-lens compensator having, facing with concave side to image, a negative meniscus which is output element of lens, and a meniscus positioned in front of it, whose convexity faces convexity of output meniscus. Both menisci are made from same material as lens of first compensator. Between compensators are arranged in series in direction of propagation of beams two mirrors, first of which is concave with a hole in central part, and second is convex.

EFFECT: technical result is wider spectral range due to reduction of secondary spectrum while maintaining diffraction image quality on entire image field.

1 cl, 3 dwg