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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 19 — Sep. 14, 2009
  • pp: 16820–16833

Sinusoidal B-M method based spectral domain optical coherence tomography for the elimination of complex-conjugate artifact

Kai Wang, Zhihua Ding, Yan Zeng, Jie Meng, and Minghui Chen  »View Author Affiliations


Optics Express, Vol. 17, Issue 19, pp. 16820-16833 (2009)
http://dx.doi.org/10.1364/OE.17.016820


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Abstract

A high speed spectral domain optical coherence tomography based on the spatial sinusoidal phase modulation for the elimination of complex-conjugate artifact is presented, where sinusoidal phase modulation of reference arm (M scan) and transverse scanning of sample arm (B scan) are performed simultaneously (sinusoidal B-M method). Herein, the linear phase modulation of the reference arm in conventional linear B-M method is modified to sinusoidal phase modulation. The proposed sinusoidal B-M method relaxes the requirements on the phase-shifting mechanical system and avoids sensitivity fall-off along the transverse direction in contrast to the linear B-M method. A criterion for the relation between transverse over-sampling factor and modulation frequency for optimal complex conjugate rejection is deduced and verified by experiments. Under this criterion, the complex spectral interferogram is reconstructed by harmonic analysis and digital synchronous demodulation. Double imaging depth range on fresh shrimp at A-scan rate of 10 kHz with complex conjugate rejection ratio up to 45dB is achieved.

© 2009 OSA

OCIS Codes
(100.2650) Image processing : Fringe analysis
(110.4500) Imaging systems : Optical coherence tomography
(120.5060) Instrumentation, measurement, and metrology : Phase modulation

ToC Category:
Imaging Systems

History
Original Manuscript: July 24, 2009
Revised Manuscript: August 19, 2009
Manuscript Accepted: August 25, 2009
Published: September 4, 2009

Virtual Issues
Vol. 4, Iss. 11 Virtual Journal for Biomedical Optics

Citation
Kai Wang, Zhihua Ding, Yan Zeng, Jie Meng, and Minghui Chen, "Sinusoidal B-M method based spectral domain optical coherence tomography for the elimination of complex-conjugate artifact," Opt. Express 17, 16820-16833 (2009)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-17-19-16820


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