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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 48, Iss. 10 — Apr. 1, 2009
  • pp: D144–D150

Large coherence length swept source for axial length measurement of the eye

Changho Chong, Takuya Suzuki, Kohki Totsuka, Atsushi Morosawa, and Tooru Sakai  »View Author Affiliations

Applied Optics, Vol. 48, Issue 10, pp. D144-D150 (2009)

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We present and demonstrate a swept source with a large coherence length using a quasi-phase continuous tuning (QPCT) technique. QPCT is a method of minimizing the phase shift per round trip with respect to the tunable filter so that the resonance of lasing becomes high, resulting in high finesse of lasing during a rapid sweep. The demonstrated swept source consists of a fiber ring extended cavity laser with a diffraction grating and a polygon scanner-based tunable filter configuration. The projected beam on the diffraction grating is expanded with a multiple of beam expanders to achieve high finesse of the filter. The source demonstrated an 18 nm swept range at 1060 nm wavelength, 28 mm coherence length, and 6.2 mW peak power at a 2.5 kHz swept rate. OCT imaging results showed that a coherence length of 28 mm enables the measurement of the axial length of a pig's eye with 20 mm length in physical size.

© 2009 Optical Society of America

OCIS Codes
(110.4500) Imaging systems : Optical coherence tomography
(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

Original Manuscript: September 2, 2008
Revised Manuscript: January 13, 2009
Manuscript Accepted: January 31, 2009
Published: February 26, 2009

Virtual Issues
Vol. 4, Iss. 6 Virtual Journal for Biomedical Optics

Changho Chong, Takuya Suzuki, Kohki Totsuka, Atsushi Morosawa, and Tooru Sakai, "Large coherence length swept source for axial length measurement of the eye," Appl. Opt. 48, D144-D150 (2009)

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