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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 14 — Jul. 9, 2007
  • pp: 8760–8769

Broadband sum-frequency generation as an efficient two-photon detector for optical tomography

Avi Pe'er, Yaron Bromberg, Barak Dayan, Yaron Silberberg, and Asher A. Friesem  »View Author Affiliations

Optics Express, Vol. 15, Issue 14, pp. 8760-8769 (2007)

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We describe a novel non-linear detection method for optical tomography that does not rely on detection of interference fringes and is free of optical background. The method exploits temporally coherent broadband illumination such as ultrashort pulses, and a non-linear two-photon detection process such as sum-frequency generation (SFG). At the detection stage, the reference beam and the sample beam are mixed in a thick non-linear crystal, and only the mixing term, which is free of optical background, is detected. Consequently, the noise limitations posed by the background in standard OCT (excess and shot noise), do not exist here. Due to the non-linearity, the signal to noise ratio scales more favorably with the optical power compared to standard OCT, yielding an inherent improvement for high speed tomographic scans. Careful design of phase matching in the crystal enables non-linear mixing which is both highly efficient and broadband, yielding both high sensitivity and high depth resolution.

© 2007 Optical Society of America

OCIS Codes
(110.4500) Imaging systems : Optical coherence tomography
(190.7220) Nonlinear optics : Upconversion

ToC Category:
Imaging Systems

Original Manuscript: April 2, 2007
Revised Manuscript: May 24, 2007
Manuscript Accepted: May 29, 2007
Published: June 28, 2007

Virtual Issues
Vol. 2, Iss. 8 Virtual Journal for Biomedical Optics

Avi Pe'er, Yaron Bromberg, Barak Dayan, Yaron Silberberg, and Asher A. Friesem, "Broadband sum-frequency generation as an efficient two-photon detector for optical tomography," Opt. Express 15, 8760-8769 (2007)

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