Dispersive coherence spectrotomography of a layered medium

Wataru Watanabe; Kazuyoshi Itoh

doi:10.1117/12.347829

7 May 1999 Dispersive coherence spectrotomography of a layered medium

Wataru Watanabe, Kazuyoshi Itoh

Proceedings Volume 3740, Optical Engineering for Sensing and Nanotechnology (ICOSN '99); (1999) https://doi.org/10.1117/12.347829
Event: Optical Engineering for Sensing and Nanotechnology (ICOSN '99), 1999, Yokohama, Japan

Abstract

In low-coherence reflectometry, the light backscattered from a scattering medium is expected to carry information about the spectral properties as well as range information about the reflective boundaries and backscattering sites. We show two alternative techniques to extract both the range and spectral properties of the sample by optically dispersed interferograms. The methods make the most of the brightness of white-light continuum, which is generated by focusing ultrashort laser pulses into condensed matters. The output beam from an interferometer is dispersed by a spectroscopic optical element and the dispersed signal is detected by a line detector. The salient feature of the methods is that the spectral decomposition of the white-light interferograms enhances the dynamic range and signal-to-noise ratio. One method is a scanning type. By translating a sample, spectrally-resolved interferograms are detected. Appropriate grouping of the interferograms yields both range and spectral properties of the sample. The other method is based on the principle of spectral radar due to Hausler. The spectrally- resolved fringes are acquired without scanning. The signal- processing allows us to display both the scattering amplitude and spectral properties within the bandwidth of the filters. Experimental results will be presented.

Citation Download Citation

Wataru Watanabe and Kazuyoshi Itoh "Dispersive coherence spectrotomography of a layered medium", Proc. SPIE 3740, Optical Engineering for Sensing and Nanotechnology (ICOSN '99), (7 May 1999); https://doi.org/10.1117/12.347829

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