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

Andrei V. Zvyagin, Ilos Eix, David D. Sampson

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)
9 Downloads (Pure)


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-wavelengthresolution 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.

Original languageEnglish
Pages (from-to)2179-2184
Number of pages6
JournalApplied Optics
Issue number11
Publication statusPublished - 1 Jan 2002
Externally publishedYes

Bibliographical note

This paper was published in [Applied optics] and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: [http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-41-11-2179]. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.


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