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Proceedings Paper

Low-coherence reflectometry based on DFWM in a thin liquid layer
Author(s): Vladimir B. Fleurov; Christopher M. Lawson; Denise Brown-Anderson; Alex Yu. Dergachev; Sergey B. Mirov; Robert G. Lindquist
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Paper Abstract

We describe a coherence filtering technique based on degenerate four wave mixing (DFWM) in a thin nonlinear optical material. In contrast to previous works which used ultra-short laser pulses, we performed low-coherence filtering techniques through scattering media with broad- spectrum nanosecond pulses. In our first 'proof of principle' experiments we used a 100 micrometer thick layer of dye solution as a nonlinear optical material and investigated a one dimensional case for depth-resolved measurements through a scattering media consisting of a highly scattering suspension of dielectric microspheres in water. We also describe a technique to obtain instantaneous cross-sectional images (which can be depth scanned to obtain the third dimension) performed with a low-coherence nanosecond laser source on a liquid crystal doped with an infrared dye. Experimental results were obtained with room temperature LiF:F2- and LiF:F2+ color center lasers, and a Q-switched alexandrite laser. This technique can be used to provide instantaneous, single-shot, two-dimensional images of the internal structure of materials versus depth.

Paper Details

Date Published: 7 October 1996
PDF: 9 pages
Proc. SPIE 2853, Nonlinear Optical Liquids, (7 October 1996); doi: 10.1117/12.253467
Show Author Affiliations
Vladimir B. Fleurov, Univ. of Alabama/Birmingham (United States)
Christopher M. Lawson, Univ. of Alabama/Birmingham (United States)
Denise Brown-Anderson, Univ. of Alabama/Birmingham (United States)
Alex Yu. Dergachev, Univ. of Alabama/Birmingham (United States)
Sergey B. Mirov, Univ. of Alabama/Birmingham (United States)
Robert G. Lindquist, Univ. of Alabama in Huntsville (United States)


Published in SPIE Proceedings Vol. 2853:
Nonlinear Optical Liquids
Christopher M. Lawson, Editor(s)

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