Coherence Spectrotomography of Layered Medium with White-Light Continuum

Watanabe, Wataru; Masuda, Yoshiyasu; Itoh, Kazuyoshi

doi:10.1007/s10043-999-0071-y

Cited by 7 publications

(1 citation statement)

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“…The white-light interferogram may be synthesized by integrating all the individual contributions of spectral components. We integrate the spectrally-decomposed interferograms according to a series of spectral filters designed for the spectrotomography.9 12) The dynamic range of SR is limited by the number of detector elements and the bandwidth of light source.78 It necessarily provides the symmetric scattering amplitude. These limitations may restrict the dynamic range in depth when a broadband light source is used.…”

Section: Scanning Dispersive Coherence Spectrotomographymentioning

confidence: 99%

<title>Dispersive coherence spectrotomography of a layered medium</title>

Watanabe

Itoh

1999

Optical Engineering for Sensing and Nanotechnology (ICOSN '99)

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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 speciral 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 ultrashortlaser pulses into condensed matters. The output beam from an interferometer is dispersed by a spectroscopic optical element and the dispersed signal is detectedby a line detector. The salientfeature ofthe methods is that the spectral decomposition of the white-lightinterferograms enhances the dynamic range and signal-to-noise ratio. One method is a scanning type. By translating a sample, spectrallyresolved 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 Häusler. 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.

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Section: Scanning Dispersive Coherence Spectrotomographymentioning

confidence: 99%