Abstract
In this study, we demonstrated Fourier-domain/swept-source optical coherence
tomography (FD/SS-OCT) at a center wavelength of 800 nm for in vivo human retinal
imaging. A wavelength-swept source was constructed with a semiconductor optical
amplifier, a fiber Fabry-Perot tunable filter, isolators, and a fiber coupler in a
ring cavity. Our swept source produced a laser output with a tuning range of 42 nm
(779 to 821 nm) and an average power of 3.9 mW. The wavelength-swept speed in this
configuration with bidirectionality is 2,000 axial scans per second. In addition, we
suggested a modified zero-crossing method to achieve equal sample spacing in the
wavenumber (k) domain and to increase the image depth range. FD/SS-OCT has a
sensitivity of ~89.7 dB and an axial resolution of 10.4
μm in air. When a retinal image with 2,000
A-lines/frame is obtained, an acquisition speed of 2.0 fps is achieved.
© 2011 Optical Society of Korea
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