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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 12 — Jun. 9, 2008
  • pp: 8916–8937

K-space linear Fourier domain mode locked laser and applications for optical coherence tomography

Christoph M. Eigenwillig, Benjamin R. Biedermann, Gesa Palte, and Robert Huber  »View Author Affiliations


Optics Express, Vol. 16, Issue 12, pp. 8916-8937 (2008)
http://dx.doi.org/10.1364/OE.16.008916


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Abstract

We report on a Fourier Domain Mode Locked (FDML) wavelength swept laser source with a highly linear time-frequency sweep characteristic and demonstrate OCT imaging without k-space resampling prior to Fourier transformation. A detailed theoretical framework is provided and different strategies how to determine the optimum drive waveform of the piezo-electrically actuated optical bandpass-filter in the FDML laser are discussed. An FDML laser with a relative optical frequency deviation Δν/ν smaller than 8·10-5 over a 100 nm spectral bandwidth at 1300 nm is presented, enabling high resolution OCT over long ranging depths. Without numerical time-to-frequency resampling and without spectral apodization a sensitivity roll off of 4 dB over 2 mm, 12.5 dB over 4 mm and 26.5 dB over 1 cm at 3.5 µs sweep duration and 106.6 dB maximum sensitivity at 9.2 mW average power is achieved. The axial resolution in air degrades from 14 to 21 µm over 4 mm imaging depth. The compensation of unbalanced dispersion in the OCT sample arm by an adapted tuning characteristic of the source is demonstrated. Good stability of the system without feedback-control loops is observed over hours.

© 2008 Optical Society of America

OCIS Codes
(110.4500) Imaging systems : Optical coherence tomography
(110.6880) Imaging systems : Three-dimensional image acquisition
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(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:
Imaging Systems

History
Original Manuscript: March 4, 2008
Revised Manuscript: April 19, 2008
Manuscript Accepted: April 24, 2008
Published: June 3, 2008

Virtual Issues
Vol. 3, Iss. 7 Virtual Journal for Biomedical Optics

Citation
Christoph M. Eigenwillig, Benjamin R. Biedermann, Gesa Palte, and Robert Huber, "K-space linear Fourier domain mode locked laser and applications for optical coherence tomography," Opt. Express 16, 8916-8937 (2008)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-16-12-8916


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