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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 48, Iss. 12 — Apr. 20, 2009
  • pp: 2275–2281

Achromatic digital speckle pattern interferometer with constant radial in-plane sensitivity by using a diffractive optical element

Matias R. Viotti, Walter Kapp, and Armando Albertazzi G., Jr.  »View Author Affiliations


Applied Optics, Vol. 48, Issue 12, pp. 2275-2281 (2009)
http://dx.doi.org/10.1364/AO.48.002275


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Abstract

We report on a digital speckle pattern interferometer that applies a binary diffractive optical element (DOE) to generate double illumination and radial in-plane sensitivity. The application of the DOE ensures independence on the wavelength of the laser used as an illumination source. Furthermore, in-plane sensitivity only depends on the grating period of the DOE. An experimental setup was built allowing the measurement of a set of radial in-plane displacement fields either using a red laser as a light source or a green one. When displacement fields computed from the measured optical phase maps obtained with a red or a green laser were compared, two main results were observed: (a) deviations between mean values ranged only up to 7 nm and (b) phase maps presented the same amount of fringes. In addition, phase maps measured with the red laser were processed as they were obtained with green light. For this case, deviations have ranged only up to 0.5 nm . On the other hand, a set of measurements performed changing the DOE by a conical mirror showed clearly that radial in-plane sensitivity increased when the red laser was changed by the green one.

© 2009 Optical Society of America

OCIS Codes
(050.1950) Diffraction and gratings : Diffraction gratings
(120.6165) Instrumentation, measurement, and metrology : Speckle interferometry, metrology

ToC Category:
Diffraction and Gratings

History
Original Manuscript: January 7, 2009
Revised Manuscript: March 12, 2009
Manuscript Accepted: March 13, 2009
Published: April 14, 2009

Citation
Matias R. Viotti, Walter Kapp, and Armando Albertazzi G., Jr., "Achromatic digital speckle pattern interferometer with constant radial in-plane sensitivity by using a diffractive optical element," Appl. Opt. 48, 2275-2281 (2009)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-48-12-2275


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References

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