Achromatic and apochromatic prism element employing prisms and g

Details Achromatic and apochromatic prism element employing prisms and g Achromatic and apochromatic prism element employing prisms and g

1996-01-24

1997-04-29

Epps, Georgia Y.

Optical: systems and elements

Prism

359837, 359569, 359615, G02B 504

Patent

active

056254997

ABSTRACT:
An apochromatic grism (42) includes a first prism (48) with a second prism (50) disposed adjacent to it. A grating (44) is adjacent to the front surface of the first prism (48) and the Abbe number and dispersion coefficient of the grating are chosen such that the primary and secondary angular spread for a given spectral band is approximately zero. The apochromatic grism is a simple and compact device with minimal amounts of residual chromatic and anamorphic aberrations.

REFERENCES:
patent: 2818765 (1958-01-01), Foster
patent: 3900263 (1975-08-01), Hall, Jr.
patent: 4411492 (1983-10-01), Bluege
patent: 4776652 (1988-10-01), Ih
patent: 4872747 (1989-10-01), Jalkio
patent: 5101458 (1992-03-01), Spaulding et al.
B. Nelles and E.H. Geyer, "Distortion of grating prisms, and their use in radial velocity determinations of astronomical objects with slitless field spectrographs", Alpplied Optics, vol. 20, No. 4, 15 Feb. 1981, pp. 660-664 .

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