Abstract

An improved wedge-plate shearing interferometric technique for collimation testing is presented. With two mirrors, the technique provides a twofold increase in sensitivity and has its own reference.

© 1992 Optical Society of America

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References

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  1. M. V. R. K. Murty, “The use of a single plane parallel plate as a lateral shearing interferometer with a visible gas laser,” Appl. Opt. 3, 531–534 (1964).
    [CrossRef]
  2. R. S. Sirohi, M. P. Kothiyal, “Double wedge plate shearing interferometer for collimation test,” Appl. Opt. 26, 4054–4056 (1987).
    [CrossRef] [PubMed]
  3. M. P. Kothiyal, R. S. Sirohi, K. J. Rosenbruch, “Improved techniques of collimation testing,” Opt. Laser Technol. 20, 139–144 (1988).
    [CrossRef]

1988 (1)

M. P. Kothiyal, R. S. Sirohi, K. J. Rosenbruch, “Improved techniques of collimation testing,” Opt. Laser Technol. 20, 139–144 (1988).
[CrossRef]

1987 (1)

1964 (1)

Kothiyal, M. P.

M. P. Kothiyal, R. S. Sirohi, K. J. Rosenbruch, “Improved techniques of collimation testing,” Opt. Laser Technol. 20, 139–144 (1988).
[CrossRef]

R. S. Sirohi, M. P. Kothiyal, “Double wedge plate shearing interferometer for collimation test,” Appl. Opt. 26, 4054–4056 (1987).
[CrossRef] [PubMed]

Murty, M. V. R. K.

Rosenbruch, K. J.

M. P. Kothiyal, R. S. Sirohi, K. J. Rosenbruch, “Improved techniques of collimation testing,” Opt. Laser Technol. 20, 139–144 (1988).
[CrossRef]

Sirohi, R. S.

M. P. Kothiyal, R. S. Sirohi, K. J. Rosenbruch, “Improved techniques of collimation testing,” Opt. Laser Technol. 20, 139–144 (1988).
[CrossRef]

R. S. Sirohi, M. P. Kothiyal, “Double wedge plate shearing interferometer for collimation test,” Appl. Opt. 26, 4054–4056 (1987).
[CrossRef] [PubMed]

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Figures (3)

Fig. 1
Fig. 1

Improved single-wedge-plate shearing interferometer for a collimation test. M1, M2, mirrors; WPT, wedge plate; SC, screen.

Fig. 2
Fig. 2

Interferograms showing fringe-orientation change when the point source was (a) inside, (b) at, and (c) outside the focus.

Fig. 3
Fig. 3

Interferogram for a well-collimated beam when the wedge direction was no longer perpendicular to the shear direction.

Equations (3)

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α = tan - 1 ( D Δ x / n β ) ,
2 α = 2 tan - 1 ( D Δ x / n β ) ,
Δ f min = f 2 n β ( 2 α ) min / Δ x .

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