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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 52, Iss. 5 — May. 1, 1962
  • pp: 515–518

Aspheric Ebert Monochromator for Simultaneous Observation of Many Wavelengths

M. V. K. R. MURTY  »View Author Affiliations

JOSA, Vol. 52, Issue 5, pp. 515-518 (1962)

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The Ebert spectrograph has recently been used extensively as a monochromator. In view of the spherical mirror being used as a collimator-camera mirror and the plane grating as the dispersing element, the instrument suffers mainly from spherical aberration if the ƒ-number of the system issmaller than about 9 for a 1-m focal length. Also, if many exit slits are needed over the entire spectrum of interest, the coma cannot be neglected. In order to obtain a fast spectrometer in which many exit slits could be used, the two surfaces in the system must be aspherized. The theory of such a system is presented in this paper. Specifically, a numerical example is worked out for an ƒ/5 system with 40-in. focal length and 1200 lines/mm rulings on the grating. The spectrum of interest is 1000 to 4000 Å in first order.

M. V. K. R. MURTY, "Aspheric Ebert Monochromator for Simultaneous Observation of Many Wavelengths," J. Opt. Soc. Am. 52, 515-518 (1962)

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  1. H. Ebert, Wiedemanns Ann. 38, 489 (1889).
  2. W. G. Fastie, J. Opt. Soc. Am. 42, 641 (1952).
  3. Hilger Journal VI, No. 2, 29 (1960).
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