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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editor: Gregory W. Faris
  • Vol. 4, Iss. 5 — May. 5, 2009

Subharmonic Fourier domain mode locking

Christoph M. Eigenwillig, Wolfgang Wieser, Benjamin R. Biedermann, and Robert Huber  »View Author Affiliations


Optics Letters, Vol. 34, Issue 6, pp. 725-727 (2009)
http://dx.doi.org/10.1364/OL.34.000725


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Abstract

We demonstrate a subharmonically Fourier domain mode-locked wavelength-swept laser source with a substantially reduced cavity fiber length. In contrast to a standard Fourier domain mode-locked configuration, light is recirculated repetitively in the delay line with the optical bandpass filter used as switch. The laser has a fundamental optical round trip frequency of 285 kHz and can be operated at integer fractions thereof (subharmonics). Sweep ranges up to 95 nm full width centred at 1317 nm are achieved at the 1 5 th subharmonic. A maximum sensitivity of 116 dB and an axial resolution of 12 μ m in air are measured at an average sweep power of 12 mW . A sensitivity roll-off of 11 dB over 4 mm and 25 dB over 10 mm is observed and optical coherence tomography imaging is demonstrated. Besides the advantage of a reduced fiber length, subharmonic Fourier domain mode locking (shFDML) enables simple scaling of the sweep speed by extracting light from the delay part of the resonator. A sweep rate of 570 kHz is achieved. Characteristic features of shFDML operation, such as power leakage during fly-back and cw breakthrough, are investigated.

© 2009 Optical Society of America

OCIS Codes
(110.1650) Imaging systems : Coherence imaging
(110.4500) Imaging systems : Optical coherence tomography
(110.6880) Imaging systems : Three-dimensional image acquisition
(140.3600) Lasers and laser optics : Lasers, tunable
(170.3880) Medical optics and biotechnology : Medical and biological imaging
(170.4500) Medical optics and biotechnology : Optical coherence tomography

ToC Category:
Medical Optics and Biotechnology

History
Original Manuscript: October 29, 2008
Manuscript Accepted: December 25, 2008
Published: March 3, 2009

Virtual Issues
Vol. 4, Iss. 5 Virtual Journal for Biomedical Optics

Citation
Christoph M. Eigenwillig, Wolfgang Wieser, Benjamin R. Biedermann, and Robert Huber, "Subharmonic Fourier domain mode locking," Opt. Lett. 34, 725-727 (2009)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=ol-34-6-725

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