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Proceedings Paper

Holographic optical elements for combined holographic and digital speckle pattern interferometry
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Paper Abstract

Holographically recorded diffractive optical elements are described, which can be used to implement very simple self-aligning electronic speckle pattern interferometers (ESPI) and holographic interferometers requiring only a laser source and a CCD camera in the optical set-up. The ESPI systems can utilize transmission or reflection holographic optical elements (HOEs). The HOEs are essentially amplitude beamsplitters and recombiners whose recording and reconstruction parameters can be adjusted to optimize the ratio of reference and object beams reconstruction so as to maximize subtraction fringe contrast. The HOEs are recorded using a 4-component photopolymer system. In addition the HOEs can be recorded at visible wavelengths but used in ESPI systems, which incorporate at diode laser. The diode can be wavelength modulated. In this way we can incorporate digital speckle pattern interferometry (DSPI) or amplitude and phase modulation of the optical path difference for time-averaged speckle interferometry.

Paper Details

Date Published: 27 May 2003
PDF: 7 pages
Proc. SPIE 4933, Speckle Metrology 2003, (27 May 2003); doi: 10.1117/12.516644
Show Author Affiliations
Sridhar Reddy Guntaka, Dublin Institute of Technology (Ireland)
Brian W. Bowe, Dublin Institute of Technology (Ireland)
Vincent Toal, Dublin Institute of Technology (Ireland)
Suzanne Martin, Dublin Institute of Technology (Ireland)

Published in SPIE Proceedings Vol. 4933:
Speckle Metrology 2003
Kay Gastinger; Ole Johan Lokberg; Svein Winther, Editor(s)

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