Abstract

The usefulness of a refractive null corrector is limited by how closely its aberrated wavefront can match the aspheric surface that requires testing. Guidance in both the design of the asphere to insure its nullability and the design of the null corrector is presented. A functional and constructional compendium of null corrector designs is proffered.

© 1976 Optical Society of America

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References

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  1. A. Offner, Appl. Opt. 2, 153 (1963).
    [CrossRef]
  2. R. S. Hilbert, M. P. Rimmer, Appl. Opt. 9, 849 (1970).
    [CrossRef] [PubMed]
  3. F. A. Simpson, J. Meckel, Opt. Eng. 13 (3), 101 (May–June 1974).
  4. A. J. MacGovern, J. C. Wyant, Appl. Opt. 10, 619 (1973).
    [CrossRef]
  5. W. T. Deever, “Testing of Commercial Aspheres with Computer Generated Holography,” presented at 1975 Annual Meeting of Optical Society of America, FC 19.
  6. R. S. Sirohi, H. Blume, K. J. Rosenbruch, Opt. Acta 23, 229 (1976).
    [CrossRef]

1976 (1)

R. S. Sirohi, H. Blume, K. J. Rosenbruch, Opt. Acta 23, 229 (1976).
[CrossRef]

1974 (1)

F. A. Simpson, J. Meckel, Opt. Eng. 13 (3), 101 (May–June 1974).

1973 (1)

1970 (1)

1963 (1)

Blume, H.

R. S. Sirohi, H. Blume, K. J. Rosenbruch, Opt. Acta 23, 229 (1976).
[CrossRef]

Deever, W. T.

W. T. Deever, “Testing of Commercial Aspheres with Computer Generated Holography,” presented at 1975 Annual Meeting of Optical Society of America, FC 19.

Hilbert, R. S.

MacGovern, A. J.

Meckel, J.

F. A. Simpson, J. Meckel, Opt. Eng. 13 (3), 101 (May–June 1974).

Offner, A.

Rimmer, M. P.

Rosenbruch, K. J.

R. S. Sirohi, H. Blume, K. J. Rosenbruch, Opt. Acta 23, 229 (1976).
[CrossRef]

Simpson, F. A.

F. A. Simpson, J. Meckel, Opt. Eng. 13 (3), 101 (May–June 1974).

Sirohi, R. S.

R. S. Sirohi, H. Blume, K. J. Rosenbruch, Opt. Acta 23, 229 (1976).
[CrossRef]

Wyant, J. C.

Appl. Opt. (3)

Opt. Acta (1)

R. S. Sirohi, H. Blume, K. J. Rosenbruch, Opt. Acta 23, 229 (1976).
[CrossRef]

Opt. Eng. (1)

F. A. Simpson, J. Meckel, Opt. Eng. 13 (3), 101 (May–June 1974).

Other (1)

W. T. Deever, “Testing of Commercial Aspheres with Computer Generated Holography,” presented at 1975 Annual Meeting of Optical Society of America, FC 19.

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Figures (8)

Fig. 1
Fig. 1

The simplest form of a null corrector for a convex test surface is a single positive element. The example shown introduces under-corrected spherical aberration such as would be required for an ellipsoidal test surface.

Fig. 2
Fig. 2

A two-element null corrector useful when testing a convex test surface which becomes more strongly curved with increasing aperture is illustrated. It introduces undercorrected spherical aberration.

Fig. 3
Fig. 3

When the convex test surface becomes weaker with aperture, such as an hyperboloid, this prototype is suggested, since overcorrected spherical aberration is required.

Fig. 4
Fig. 4

A single negative lens, introducing undercorrected spherical aberration, is useful for testing concave surfaces. The example shown is for a test surface more strongly curved near its edge.

Fig. 5
Fig. 5

This form of a two-element null introduces the overcorrected spherical aberration which is needed when the test surface curvature weakens with aperature.

Fig. 6
Fig. 6

Besides providing undercorrected spherical aberration for test surfaces with increasing curve strength, this null also acts as a beam expander.

Fig. 7
Fig. 7

This null form has undercorrected spherical aberration. Once the beam passes through a focal point, however, the wavefront can successfully be mated to a test surface which becomes more weakly curved with increasing aperture.

Fig. 8
Fig. 8

This null corrector has undercorrected spherical aberration which beyond focus is useful in testing surfaces that weaken with aperture. Contrast this with the form shown in Fig. 6 which has a similar wavefront.

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