Abstract

This paper describes a method of grinding a concave mirror to produce a prescribed aspheric contour. It also describes polishing and figuring procedures. The method was applied to produce a relay optical system that relayed the image of the planet Venus, at the same time correcting aberrations. The image relayed was formed by an uncorrected spherical primary telescope mirror. The relayed image was located at the center of curvature of the mirror. The image here was substantially free of spherical aberration.

© 1966 Optical Society of America

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References

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  1. M. Bottema, W. Plummer, J. Strong, R. Zander, J. Geophys. Res. 70, 4401 (1965).
    [Crossref]
  2. M. Bottema, W. Plummer, J. Strong, R. Zander, Astrophys. J. 140, 1640 (1964).
    [Crossref]

1965 (1)

M. Bottema, W. Plummer, J. Strong, R. Zander, J. Geophys. Res. 70, 4401 (1965).
[Crossref]

1964 (1)

M. Bottema, W. Plummer, J. Strong, R. Zander, Astrophys. J. 140, 1640 (1964).
[Crossref]

Bottema, M.

M. Bottema, W. Plummer, J. Strong, R. Zander, J. Geophys. Res. 70, 4401 (1965).
[Crossref]

M. Bottema, W. Plummer, J. Strong, R. Zander, Astrophys. J. 140, 1640 (1964).
[Crossref]

Plummer, W.

M. Bottema, W. Plummer, J. Strong, R. Zander, J. Geophys. Res. 70, 4401 (1965).
[Crossref]

M. Bottema, W. Plummer, J. Strong, R. Zander, Astrophys. J. 140, 1640 (1964).
[Crossref]

Strong, J.

M. Bottema, W. Plummer, J. Strong, R. Zander, J. Geophys. Res. 70, 4401 (1965).
[Crossref]

M. Bottema, W. Plummer, J. Strong, R. Zander, Astrophys. J. 140, 1640 (1964).
[Crossref]

Zander, R.

M. Bottema, W. Plummer, J. Strong, R. Zander, J. Geophys. Res. 70, 4401 (1965).
[Crossref]

M. Bottema, W. Plummer, J. Strong, R. Zander, Astrophys. J. 140, 1640 (1964).
[Crossref]

Astrophys. J. (1)

M. Bottema, W. Plummer, J. Strong, R. Zander, Astrophys. J. 140, 1640 (1964).
[Crossref]

J. Geophys. Res. (1)

M. Bottema, W. Plummer, J. Strong, R. Zander, J. Geophys. Res. 70, 4401 (1965).
[Crossref]

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Figures (10)

Fig. 1
Fig. 1

Ray trace showing need for an aspheric surface. (Diagram is not drawn to scale.)

Fig. 2
Fig. 2

Determination of required pin projection.

Fig. 3
Fig. 3

Lap and mirror before grinding.

Fig. 4
Fig. 4

Lap and mirror at an early stage of grinding.

Fig. 5
Fig. 5

Sectional view of device in use.

Fig. 6
Fig. 6

Photograph of device in use.

Fig. 7
Fig. 7

Centering and zeroing accessories.

Fig. 8
Fig. 8

Photograph of centering and zeroing accessories.

Fig. 9
Fig. 9

Showing polishing of successive zones as result of scraping away of pitch.

Fig. 10
Fig. 10

This diagram shows the old and new all-mirror relays and their relation to the main telescope. The old system has both mirrors spherical. The new system, for which the Schmidt corrector-plate is not needed, has one mirror aspheric, as indicated. The insert, at lower right, shows the longitudinal aberration at M, calculated by ray tracing for the new system surfaces defined above.

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