Holographic interferometry with ultrashort laser pulses

Torgny E. Carlsson

doi:10.1117/12.209627

30 May 1995 Holographic interferometry with ultrashort laser pulses

Torgny E. Carlsson

Proceedings Volume 2513, 21st International Congress on: High-Speed Photography and Photonics; (1995) https://doi.org/10.1117/12.209627
Event: High-Speed Photography and Photonics: 21st International Congress, 1994, Taejon, Korea, Republic of

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.

Citation Download Citation

Torgny E. Carlsson "Holographic interferometry with ultrashort laser pulses", Proc. SPIE 2513, 21st International Congress on: High-Speed Photography and Photonics, (30 May 1995); https://doi.org/10.1117/12.209627

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