| 摘要 |
FIELD: physics. ^ SUBSTANCE: system includes two hyperbolic mirrors lying on a beam path, the first facing the object space with its concave side, and the second facing the first with its convex side. The first mirror has a centre hole with diameter D1. D1ëñD2, where D2 is the clear aperture of the second mirror. Near the focal plane of the lens there is a lens corrector, all of the working surfaces of which are spherical and the clear aperture D3 is such that D3ëñD1. The first mirror has optical power å1 such that -3.2ëñå1ëñ-3.0, with eccentricity squared ä«1Çè2 such that 1.00ëñä«1Çè2ëñ1.26. The second mirror has optical power å2 such that -8.0ëñå2ëñ-7.0, with eccentricity squared ä«2Çè2 such that 4.5ëñä«2Çè2ëñ6.5. The distance d1-2 between the first and second mirrors is such that 0.3fëñd1-2ëñ-0.2f, where f is the focal length of the system. The corrector is in form of a meniscus lens whose convex surface faces the second mirror, with optical power å3 such that -3.4ëñå3ëñ-2.8, and lies at a distance d2-3 from the second mirror, which is such that 0.16fëñd2-3ëñ0.3f. The thickness h of the meniscus of the corrector is such that 0.004fëñhëñ0.006f. ^ EFFECT: obtaining a high-quality image in a wide spectral range, which is uniform on the field of view using standard manufacturing, assembling and adjustment techniques. ^ 1 dwg, 5 tbl |
