High-speed, high-sensitivity, gated surface profiling with closed-loop optical coherence topography

A.V. Zvyagin, I. Eix, David Sampson

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    5 Citations (Scopus)


    We describe and experimentally demonstrate a novel (to our knowledge) surface profiling technique, for which we propose the term closed-loop optical coherence topography. This technique is a scanning beam, servo-locked variation of low-coherence interferometry. It allows for the sub-wavelength-resolution tracking of a weakly scattering macroscopic-scale surface, with the surface profile being directly output by the controlling electronics. The absence of significant real-time computational overhead makes the technique well suited to high-speed tracking. The use of a micrometer-scale coherence gate efficiently suppresses signals arising from structures not associated with the surface. These features make the technique particularly well suited to real-time surface profiling of in vivo, macroscopic biological surfaces, (C) 2002 Optical Society of America.
    Original languageEnglish
    Pages (from-to)2179-2184
    JournalApplied Optics
    Issue number11
    Publication statusPublished - 2002


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