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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 23, Iss. 5 — May. 1, 1933
  • pp: 178–181

Focus of a Concave Grating Spectrograph

DAVID L. MAcADAM  »View Author Affiliations


JOSA, Vol. 23, Issue 5, pp. 178-181 (1933)
http://dx.doi.org/10.1364/JOSA.23.000178


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Abstract

The problem of mounting a twenty-one foot concave grating and slit at oblique incidence, so that the focus will lie on a previously established track having less than one inch adjustment range, is discussed. A simple technique, employing only a good transit, is described. The development of this method depends on a precise knowledge of the nature of the general focal curve. This information is found by a brief examination of grating theory. A table of permissible departures of the slit from the Rowland circle is given, such that the error in path length to the sharpest image is less than λ/4. Application of classical grating theory to the case of oblique incidence and diffraction results in an expression for maximum useful grating width. This expression is shown to differ only by a factor of 1.06 from the expression derived in a recent article by Mack, Stehn and Edlén.

Citation
DAVID L. MAcADAM, "Focus of a Concave Grating Spectrograph," J. Opt. Soc. Am. 23, 178-181 (1933)
http://www.opticsinfobase.org/josa/abstract.cfm?URI=josa-23-5-178

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