Optical system and method for eliminating overlap of diffraction

Details Optical system and method for eliminating overlap of diffraction Optical system and method for eliminating overlap of diffraction

1993-04-30

1995-06-13

Evans, F. L.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01J 336

Patent

active

054248272

ABSTRACT:
An optical system and a method for separating overlapping spectra from a diffraction grating and an imaging spectrometer with increased free spectral range are disclosed. The light from a diffraction grating consists of multiple spectra overlapping each other and displaced along a spectral axis. The invention directs the light from the grating to a refractive element such, as a prism. The prism further disperses the light along the same spectral axis. The individual spectra are sufficiently displaced such that they no longer interfere with each other.

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Kingslake, Rudolf, Applied Optics and Optical Engineering; vol. 5; Academic Press, New York 1969. pp. 80-83.
Daniel J. Schroeder, Astronomical Optics, Academic Press, Inc., pp. 284-291.

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