Two-dimensional dispersive coherence spectrotomography with white-light continuum

Kazuyoshi Itoh; Wataru Watanabe

doi:10.1117/12.366306

27 October 1999 Two-dimensional dispersive coherence spectrotomography with white-light continuum

Kazuyoshi Itoh, Wataru Watanabe

Proceedings Volume 3753, Imaging Spectrometry V; (1999) https://doi.org/10.1117/12.366306
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

Abstract

We present experimental results of dispersive coherence spectrotomography (DCST) with the white-light continuum. The dispersive coherence spectrotomography enables us to extract both range and spectral properties inside a medium. The main feature is that DCST has the high dynamic range in depth and high signal-to-noise ratio making the most of the extreme brightness of the white-light continuum. The principle of DCST is based on a spectral decomposition of the white-light interferograms. The system consists of a Michelson interferometer followed by a spectrometer. The system is illuminated by the white-light continuum through a cylindrical lens and narrow strip lines of the white continuum are formed in the 3-D sample and on the reference mirror surface. Backscattered light from the sample is recombined with the reference light. We superpose spectrally dispersed images of the strip lines distributed along a chromatic axis on the surface of the CCD. By translating the sample along the optical axis, the spectrally decomposed interferograms are obtained from the detector elements. We sum up the spectrally- decomposed interferograms according to spectral filters designed for the spectromography and get the coherence spectrotomogram that contains the spatial and spectral distribution over the 2-D cross-section of the sample volume. The depth and spectral properties of colored layers have successfully been extracted.

Citation Download Citation

Kazuyoshi Itoh and Wataru Watanabe "Two-dimensional dispersive coherence spectrotomography with white-light continuum", Proc. SPIE 3753, Imaging Spectrometry V, (27 October 1999); https://doi.org/10.1117/12.366306

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