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Proceedings Paper

Holographic interferometry with ultrashort laser pulses
Author(s): Torgny E. Carlsson
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Paper Abstract

A method is presented for simultaneous measurement of object shape and displacement by combining Light-in-Flight recording by holography with holographic interferometry. The technique makes it possible to use ultra-short pulses, picoseconds or shorter, to examine extremely rapid dynamic events. Theoretical and experimental results for fringe evaluation are presented. If a Light-in-Flight hologram is double exposed, and the object under study is displaced between the exposures, two images will overlap. If the deformations are in the order of micrometers, an ordinary interferogram is attained by letting an image processing system adding together the interference fringes seen for each contouring line, but with the additional advantage of information of the 3D shape. If the deformations are large compared to the wavelength and small compared to the coherencelength, the two images will partly overlap. The envelope of the intensity curve becomes broadened. This broadening is a measure of the displacement. If the deformations are large compared to both the wavelength and the coherencelength used, two separated contouring lines results, representing the two different object positions.

Paper Details

Date Published: 30 May 1995
PDF: 11 pages
Proc. SPIE 2513, 21st International Congress on: High-Speed Photography and Photonics, (30 May 1995); doi: 10.1117/12.209627
Show Author Affiliations
Torgny E. Carlsson, Royal Institute of Technology (Sweden)

Published in SPIE Proceedings Vol. 2513:
21st International Congress on: High-Speed Photography and Photonics
Ung Kim; Joon-Sung Chang; Seung-Han Park, Editor(s)

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