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Proceedings Paper

Angular dispersion of double-diffraction grazing-incidence spectrograph
Author(s): Haim Lotem; Mordechai Lando; Avraham Lorber; Dan Manor
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Paper Abstract

Utilization of linear array detectors in spectroscopy enables efficient and fast spectral data accumulation of entire spectral bands. The dependence of wavelength on the location along the detector is thus, a pertinent issue in modern spectroscopy. We discuss the behavior of the angular spectral dispersion of plane grating spectrographs in double- diffraction grazing-incidence geometry, and compare it to Littrow mounting. In the Littrow case, the dependence of the dispersion on wavelength is almost linear for narrow spectral bands, but the slope depends on wavelength. In contrast, in a double-diffraction grazing-incidence spectrograph the dispersion deviates strongly from linearity with wavelength. However, relative to the diffraction angle at a reference wavelength, (lambda) G, the shape of the dispersion curve in the band of maximum dispersion is, to a first approximation, constant and independent of the spectrograph wavelength setting. The reference wavelength is the one that is propagating normal to the plane folding mirror in the spectrograph, and it may be tuned by rotating the mirror. This characteristic of the dispersion is an important advantage in the calibrating process of the instrument.

Paper Details

Date Published: 22 September 1997
PDF: 7 pages
Proc. SPIE 3110, 10th Meeting on Optical Engineering in Israel, (22 September 1997); doi: 10.1117/12.281350
Show Author Affiliations
Haim Lotem, Nuclear Research Ctr.-Negev (Israel)
Mordechai Lando, Nuclear Research Ctr.-Negev (Israel)
Avraham Lorber, Nuclear Research Ctr.-Negev (Israel)
Dan Manor, Nuclear Research Ctr.-Negev (Israel)


Published in SPIE Proceedings Vol. 3110:
10th Meeting on Optical Engineering in Israel

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