Abstract

A variety of four-mirror telescopes are described, all corrected for spherical aberration, coma, and astigmatism; all unobscured; and all with spherical surfaces. Performance is discussed with an afocal beam expander and a flat-field telescope as typical design examples.

© 1978 Optical Society of America

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References

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  1. C. R. Burch, Proc. Phys. Soc. London 59, 41 (1947).
    [CrossRef]
  2. S. Rosin, Appl. Opt. 7, 1483 (1968).
    [CrossRef] [PubMed]
  3. A. Offner, Opt. Eng. 14, 130 (1975).
    [CrossRef]

1975

A. Offner, Opt. Eng. 14, 130 (1975).
[CrossRef]

1968

1947

C. R. Burch, Proc. Phys. Soc. London 59, 41 (1947).
[CrossRef]

Burch, C. R.

C. R. Burch, Proc. Phys. Soc. London 59, 41 (1947).
[CrossRef]

Offner, A.

A. Offner, Opt. Eng. 14, 130 (1975).
[CrossRef]

Rosin, S.

Appl. Opt.

Opt. Eng.

A. Offner, Opt. Eng. 14, 130 (1975).
[CrossRef]

Proc. Phys. Soc. London

C. R. Burch, Proc. Phys. Soc. London 59, 41 (1947).
[CrossRef]

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Figures (9)

Fig. 1
Fig. 1

Burch anastigmatic telescope—two concentric spheres.

Fig. 2
Fig. 2

Burch telescope used backward—still anastigmatic.

Fig. 3
Fig. 3

Inverse Cassegrainian anastigmatic relay—two concentric spheres.

Fig. 4
Fig. 4

Three reflection anastigmatic relay—two concentric spheres.

Fig. 5
Fig. 5

Unobscured anastigmatic telescope—all spheres, four reflections.

Fig. 6
Fig. 6

Eight to one afocal beam expander—all spheres, anastigmatic.

Fig. 7
Fig. 7

Unobscured anastigmatic telescope—all spheres, five reflections.

Fig. 8
Fig. 8

Ring-field variation.

Fig. 9
Fig. 9

Folded flat-field, distortion-free, anastigmatic telescope, with all spherical surfaces.

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