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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 14, Iss. 8 — Apr. 17, 2006
  • pp: 3225–3237

Fourier Domain Mode Locking (FDML): A new laser operating regime and applications for optical coherence tomography

R. Huber, M. Wojtkowski, and J. G. Fujimoto  »View Author Affiliations


Optics Express, Vol. 14, Issue 8, pp. 3225-3237 (2006)
http://dx.doi.org/10.1364/OE.14.003225


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Abstract

We demonstrate a new technique for frequency-swept laser operation--Fourier domain mode locking (FDML)--and its application for swept-source optical coherence tomography (OCT) imaging. FDML is analogous to active laser mode locking for short pulse generation, except that the spectrum rather than the amplitude of the light field is modulated. High-speed, narrowband optical frequency sweeps are generated with a repetition period equal to the fundamental or a harmonic of cavity round-trip time. An FDML laser is constructed using a long fiber ring cavity, a semiconductor optical amplifier, and a tunable fiber Fabry-Perot filter. Effective sweep rates of up to 290 kHz are demonstrated with a 105 nm tuning range at 1300 nm center wavelength. The average output power is 3mW directly from the laser and 20 mW after post-amplification. Using the FDML laser for swept-source OCT, sensitivities of 108 dB are achieved and dynamic linewidths are narrow enough to enable imaging over a 7 mm depth with only a 7.5 dB decrease in sensitivity. We demonstrate swept-source OCT imaging with acquisition rates of up to 232,000 axial scans per second. This corresponds to 906 frames/second with 256 transverse pixel images, and 3.5 volumes/second with a 256x128x256 voxel element 3-DOCT data set. The FDML laser is ideal for swept-source OCT imaging, thus enabling high imaging speeds and large imaging depths.

© 2006 Optical Society of America

OCIS Codes
(110.4500) Imaging systems : Optical coherence tomography
(140.3600) Lasers and laser optics : Lasers, tunable

ToC Category:
Imaging Systems

History
Original Manuscript: January 20, 2006
Revised Manuscript: March 30, 2006
Manuscript Accepted: April 2, 2006
Published: April 17, 2006

Virtual Issues
Vol. 1, Iss. 5 Virtual Journal for Biomedical Optics

Citation
R. Huber, M. Wojtkowski, and J. G. Fujimoto, "Fourier Domain Mode Locking (FDML): A new laser operating regime and applications for optical coherence tomography," Opt. Express 14, 3225-3237 (2006)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-14-8-3225


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