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Proceedings Paper

Speckle: two new metrology techniques
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Paper Abstract

Speckle fields are formed when quasi-monochromatic light is scattered by an optically rough surface. These fields are usually described by reference to their first and second order statistical properties. In this paper we review and extend some of these fundamental properties and propose a novel technique for estimating the refractive index of a smooth sample. Theoretical and experimental results are presented. Separately, we also report on a preliminary experiment to determine some characteristics of speckle fields formed in free space by a rotating compound diffuser. Some initial measurements are made where we examine how the speckle intensity pattern in the output plane changes as a function of the relative rotation angle.

Paper Details

Date Published: 4 May 2012
PDF: 11 pages
Proc. SPIE 8429, Optical Modelling and Design II, 84290X (4 May 2012); doi: 10.1117/12.922493
Show Author Affiliations
Dayan Li, Univ. College Dublin (Ireland)
Raoul Kirner, Technische Univ. Ilmenau (Germany)
Damien P. Kelly, Technische Univ. Ilmenau (Germany)
John T. Sheridan, Univ. College Dublin (Ireland)

Published in SPIE Proceedings Vol. 8429:
Optical Modelling and Design II
Frank Wyrowski; John T. Sheridan; Jani Tervo; Youri Meuret, Editor(s)

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