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Applied Optics

Applied Optics


  • Vol. 41, Iss. 11 — Apr. 8, 2002
  • pp: 2179–2184

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

Andrei V. Zvyagin, Ilos Eix, and David D. Sampson  »View Author Affiliations

Applied Optics, Vol. 41, Issue 11, pp. 2179-2184 (2002)

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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.

© 2002 Optical Society of America

OCIS Codes
(110.4500) Imaging systems : Optical coherence tomography
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.6650) Instrumentation, measurement, and metrology : Surface measurements, figure
(170.1650) Medical optics and biotechnology : Coherence imaging

Original Manuscript: July 18, 2001
Revised Manuscript: January 2, 2002
Published: April 10, 2002

Andrei V. Zvyagin, Ilos Eix, and David D. Sampson, "High-speed, high-sensitivity, gated surface profiling with closed-loop optical coherence topography," Appl. Opt. 41, 2179-2184 (2002)

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