Abstract

A lateral wavefront shearing interferometer is presented. Two diffraction gratings are used as beam splitters in the Fraunhofer planes of two successive image forming systems. Each diffraction order of the first grating forms an image of the object in an intermediate image plane. These are completely separated from each other, so that all but two can be blocked out. Then the second grating, together with the second image forming system, creates two partially overlapping sets of images of the two passing intermediate images. A variable lateral shear between these two sets is achieved by rotation of the gratings in opposite senses. The principle of this shearing interferometer has been experimentally verified. It can be simplified by folding so that only one grating and one image forming system are needed. Furthermore, a sine wave generator using an extended, polychromatic source is presented which is built on this principle.

© 1967 Optical Society of America

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References

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  1. C. Barus, Carnegie Inst. Wash. Publ. 149, Part I (1911), Part II (1912), Part III (1914); Publ. 229(1915).
  2. V. Ronchi, Ann. Scuola Normale Superiore Pisa 15(1923); Appl. Opt. 3, 437 (1964).
  3. W. H. Steel, Opt. Acta 11, 9 (1964).
    [Crossref]
  4. R. Drougard, J. Wilczynski, J. Opt. Soc. Am. 55, 1638 (1965).
    [Crossref]

1965 (1)

1964 (1)

W. H. Steel, Opt. Acta 11, 9 (1964).
[Crossref]

1923 (1)

V. Ronchi, Ann. Scuola Normale Superiore Pisa 15(1923); Appl. Opt. 3, 437 (1964).

1911 (1)

C. Barus, Carnegie Inst. Wash. Publ. 149, Part I (1911), Part II (1912), Part III (1914); Publ. 229(1915).

Barus, C.

C. Barus, Carnegie Inst. Wash. Publ. 149, Part I (1911), Part II (1912), Part III (1914); Publ. 229(1915).

Drougard, R.

Ronchi, V.

V. Ronchi, Ann. Scuola Normale Superiore Pisa 15(1923); Appl. Opt. 3, 437 (1964).

Steel, W. H.

W. H. Steel, Opt. Acta 11, 9 (1964).
[Crossref]

Wilczynski, J.

Ann. Scuola Normale Superiore Pisa (1)

V. Ronchi, Ann. Scuola Normale Superiore Pisa 15(1923); Appl. Opt. 3, 437 (1964).

Carnegie Inst. Wash. Publ. (1)

C. Barus, Carnegie Inst. Wash. Publ. 149, Part I (1911), Part II (1912), Part III (1914); Publ. 229(1915).

J. Opt. Soc. Am. (1)

Opt. Acta (1)

W. H. Steel, Opt. Acta 11, 9 (1964).
[Crossref]

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Figures (4)

Fig. 1
Fig. 1

Schematic diagram of the shearing interferometer. For notations see text. All components are located a focal length apart causing the source to be imaged onto the gratings G1 and G2 and the object O onto the planes M and I. One of the orders from the first grating and the set of orders arising from it at the second grating is full drawn and a second case is dashed drawn.

Fig. 2
Fig. 2

Folded version of the shearing interferometer. The order selecting mask is placed next to the roof prism.

Fig. 3
Fig. 3

Interferograms of mica specimen with even field. The upper record shows less shearing than the lower one. The height of the object was 3 mm.

Fig. 4
Fig. 4

Interferograms of the same mica specimen as in Fig. 3 but with a field crossed by fringes.

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