Doubling spectral resolution

Details Doubling spectral resolution Doubling spectral resolution

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.250..796w&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 250, June 15, 1991, p. 796-801.

Astronomy and Astrophysics

Astronomy

8

Diffraction Limited Cameras, Gratings (Spectra), Spectral Resolution, Astronomical Spectroscopy, Prisms, Spectrographs

Scientific paper

The present paper addresses the use of diffraction gratings in general-purpose astronomic spectrographs, the grating limitations, and means of alleviating them. Grating characteristics are presented, and light loss is considered. It is concluded that, where lambda is the wavelength, s the groove spacing, m the order of diffraction, and n the reflexive index, then, (1) for given values of s and m, immersion extends diffraction to longer wavelengths than are accessible in air, and hence to higher values of R; (2) for given values of m and lambda, immersion allows the use of smaller s (finer ruled gratings) than can be used only in air at very short wavelengths, and hence an improvement of resolution; and (3) for given values of s and lambda, immersion gives access to n times higher order than in air. The procedures described offer a substantial increase of light throughput over current practice and the possibility of doubling the spectral resolution of conventional spectrographs.

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