Mirror optics with grazing incidence reflection

Optical: systems and elements – Having significant infrared or ultraviolet property – Having folded optical path

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Details

359352, 359356, 359357, 359366, 359731, 359857, 359859, 359861, 25033908, G02B 1700

Patent

active

054953634

ABSTRACT:
In an infrared (IR) microscope for a Fourier transform (FT) infrared spectrometer with a Cassegrain mirror-lens with which an incident beam (15) can be focused via a convex mirror (16) and a concave mirror (17) onto a first point-shaped region (19) on the surface of a sample (20) under an angle of incidence .beta.<60.degree. relative to the optical axis (22) and subsequent to travelling through an optical path x, a first planar mirror (1) and a second planar mirror (2) are arranged between the concave mirror (17) and the surface of the sample (20) such that the luminous beam (30) reflected from the concave mirror (17) in the direction of the sample (20) is focused onto the first planar mirror (1), onto the second planar mirror (2), then onto a second point-shaped region (19') on the surface of the sample (20), the second point-shaped region lying on the optical axis (22) closer to the lens (16, 17) than the first point-shaped region (19), whereby the sum of the optical paths is equal to the optical path x, whereby the angle of incidence .beta.' is larger than 60.degree. and whereby a third planar mirror (3) and a fourth planar mirror (4) are arranged symmetrically with respect to the second (2) and first (1) planar mirrors.

REFERENCES:
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patent: 4712912 (1987-12-01), Messerschmidt
patent: 4810077 (1989-03-01), Sting
patent: 5051602 (1991-09-01), Sting et al.
patent: 5144496 (1992-09-01), Kashima
patent: 5291340 (1994-03-01), Kashima

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