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Optics Letters

Optics Letters


  • Editor: Xi-Cheng Zhang
  • Vol. 39, Iss. 3 — Feb. 1, 2014
  • pp: 622–625

Megahertz all-optical swept-source optical coherence tomography based on broadband amplified optical time-stretch

Jingjiang Xu, Chi Zhang, Jianbing Xu, K. K. Y. Wong, and K. K. Tsia  »View Author Affiliations

Optics Letters, Vol. 39, Issue 3, pp. 622-625 (2014)

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We demonstrate all-optical ultrahigh-speed swept-source optical coherence tomography (OCT) based on amplified optical time-stretch (AOT). Such an inertia-free wavelength-swept mechanism, via group velocity dispersion, enables us to realize OCT with an A-scan rate well above MHz. More importantly, the key significance of AOT-OCT is its simultaneous broadband Raman amplification during the time-stretch process–greatly enhancing the detection sensitivity compared with prior attempts to apply optical time-stretch to OCT. Here, we report on an AOT-OCT system which is operated at an A-scan rate of 7.14 MHz, a superior roll-off performance (>2mm/dB), a record-high sensitivity of time-stretch-based OCT (>80dB) with a broadband gain bandwidth of 80 nm, which results in an axial resolution of 15μm. Our AOT-OCT system is thus able to, for the first time to the best of our knowledge, perform time-stretch-based OCT of biological tissue in vivo. It represents a major step forward in utilizing AOT as an alternative for achieving practical MHz OCT, without any long-term mechanical stability concerns as in typical swept-source OCT or bypassing the speed limitation of the image sensor employed in spectral-domain OCT.

© 2014 Optical Society of America

OCIS Codes
(110.4500) Imaging systems : Optical coherence tomography
(170.3880) Medical optics and biotechnology : Medical and biological imaging
(170.4500) Medical optics and biotechnology : Optical coherence tomography
(190.5650) Nonlinear optics : Raman effect

ToC Category:
Medical Optics and Biotechnology

Original Manuscript: October 24, 2013
Revised Manuscript: December 17, 2013
Manuscript Accepted: December 23, 2013
Published: January 28, 2014

Virtual Issues
Vol. 9, Iss. 4 Virtual Journal for Biomedical Optics

Jingjiang Xu, Chi Zhang, Jianbing Xu, K. K. Y. Wong, and K. K. Tsia, "Megahertz all-optical swept-source optical coherence tomography based on broadband amplified optical time-stretch," Opt. Lett. 39, 622-625 (2014)

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