Abstract

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 18nm swept range at 1060nm wavelength, 28mm coherence length, and 6.2mW peak power at a 2.5kHz swept rate. OCT imaging results showed that a coherence length of 28mm enables the measurement of the axial length of a pig's eye with 20mm length in physical size.

© 2009 Optical Society of America

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