Abstract

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.

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References

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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).
  4. R. F. Jarrell, J. Opt. Soc. Am. 45, 259 (1955).
  5. P. C. von Planta, J. Opt. Soc. Am. 47, 629 (1957).
  6. W. G. Fastie, H. M. Crosswhite, and P. Gloersen, J. Opt. Soc. Am. 48, 106 (1958).
  7. D. W. Robinson, J. Opt. Soc. Am. 49, 966 (1959).
  8. F. B. Wright, Publs. Astron. Soc. Pacific 47, 300 (1935).
  9. G. H. Spencer and M. V. R. K. Murty (to be published).

Crosswhite, H. M.

W. G. Fastie, H. M. Crosswhite, and P. Gloersen, J. Opt. Soc. Am. 48, 106 (1958).

Ebert, H.

H. Ebert, Wiedemanns Ann. 38, 489 (1889).

Fastie, W. G.

W. G. Fastie, H. M. Crosswhite, and P. Gloersen, J. Opt. Soc. Am. 48, 106 (1958).

W. G. Fastie, J. Opt. Soc. Am. 42, 641 (1952).

Gloersen, P.

W. G. Fastie, H. M. Crosswhite, and P. Gloersen, J. Opt. Soc. Am. 48, 106 (1958).

Jarrell, R. F.

R. F. Jarrell, J. Opt. Soc. Am. 45, 259 (1955).

Murty, M. V. R. K.

G. H. Spencer and M. V. R. K. Murty (to be published).

Planta, P. C. von

P. C. von Planta, J. Opt. Soc. Am. 47, 629 (1957).

Robinson, D. W.

D. W. Robinson, J. Opt. Soc. Am. 49, 966 (1959).

Spencer, G. H.

G. H. Spencer and M. V. R. K. Murty (to be published).

Wright, F. B.

F. B. Wright, Publs. Astron. Soc. Pacific 47, 300 (1935).

Other

H. Ebert, Wiedemanns Ann. 38, 489 (1889).

W. G. Fastie, J. Opt. Soc. Am. 42, 641 (1952).

Hilger Journal VI, No. 2, 29 (1960).

R. F. Jarrell, J. Opt. Soc. Am. 45, 259 (1955).

P. C. von Planta, J. Opt. Soc. Am. 47, 629 (1957).

W. G. Fastie, H. M. Crosswhite, and P. Gloersen, J. Opt. Soc. Am. 48, 106 (1958).

D. W. Robinson, J. Opt. Soc. Am. 49, 966 (1959).

F. B. Wright, Publs. Astron. Soc. Pacific 47, 300 (1935).

G. H. Spencer and M. V. R. K. Murty (to be published).

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