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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 44, Iss. 20 — Jul. 10, 2005
  • pp: 4272–4280

Dispersion compensation in high-speed optical coherence tomography by acousto-optic modulation

Tuqiang Xie, Zhenguo Wang, and Yingtian Pan  »View Author Affiliations


Applied Optics, Vol. 44, Issue 20, pp. 4272-4280 (2005)
http://dx.doi.org/10.1364/AO.44.004272


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Abstract

We report studies of the analyses of and compensation for group dispersion to improve the axial resolution of high-speed optical coherence tomography (OCT) by acousto-optic modulation (AOM). Theoretical modeling and experiments reveal that the high-order group dispersion induced by acousto-optic crystals broadens the measured coherence length (Lc) and thus degrades the axial resolution of OCT imaging. Based on our experimental studies, we can compensate for the dispersion to less than 50% broadening of the source Lc by adjusting the grating-lens-based optical delay in the reference arm and can further eliminate it by inserting like acousto-optic crystals in the sample arm of the OCT system. The results demonstrate that this AOM-mediated OCT system permits high-performance OCT imaging at A-scan rates of as much as 4 kHz by use of a resonant scanner. Because of its ultrastable direct frequency modulation, this AOM-mediated OCT system can potentially improve the performance of high-speed Doppler OCT techniques.

© 2005 Optical Society of America

OCIS Codes
(110.4500) Imaging systems : Optical coherence tomography
(120.5060) Instrumentation, measurement, and metrology : Phase modulation
(170.3880) Medical optics and biotechnology : Medical and biological imaging
(170.3890) Medical optics and biotechnology : Medical optics instrumentation
(230.1040) Optical devices : Acousto-optical devices
(260.2030) Physical optics : Dispersion

History
Original Manuscript: October 5, 2004
Revised Manuscript: February 17, 2005
Manuscript Accepted: February 20, 2005
Published: July 10, 2005

Citation
Tuqiang Xie, Zhenguo Wang, and Yingtian Pan, "Dispersion compensation in high-speed optical coherence tomography by acousto-optic modulation," Appl. Opt. 44, 4272-4280 (2005)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-44-20-4272

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