Abstract
We present an ultrahigh-speed optical coherence tomography (OCT) based on an all-optical swept-source with an A-scan rate of 40 MHz. The inertia-free swept-source, which has its output power of 41.2 mW and tuning range of 40 nm and high scan linearity in wavenumber with Pearson's correlation coefficients r of 0.9996, consists of a supercontinuum laser, an optical band-pass filter, a linearly chirped fiber Bragg grating, an erbium-doped fiber amplifier, and two buffer stages. With sensitivity of 87 dB, high-speed OCT imaging of biological tissue in vivo is also demonstrated.
Highlights
Optical coherence tomography (OCT) has attracted much attention since it was introduced in the 1990s
No OCT images of biological tissues were demonstrated in all these optical time-stretch swept-source-based OCT systems
We demonstrate all-optical Swept-source OCT (SS-OCT) based on the buffered optical time-stretch technique utilizing linearly chirped fiber Bragg gratings (LCFBGs) as the dispersive medium and achieve a linear-in-wavenumber tuning range of 40 nm at an A-scan rate of 40 MHz
Summary
Moon and Kim introduced an ultrahigh-speed SS-OCT with a stretched pulse supercontinuum source (SC) at a scanning rate of 5 MHz.[10] Goda et al reported a high-throughput OCT system with an A-scan rate of 90.9 MHz at 800 nm.[11] no OCT images of biological tissues were demonstrated in all these optical time-stretch swept-source-based OCT systems. Xu et al demonstrated amplified optical timestretch and all-fiber breathing laser-based all-optical ultrahigh-speed SS-OCT at an A-scan rate of 7.14 and 11.5 MHz, respectively.[12,13] the effective A-scan rate of the former was only 1.2 MHz due to the averaging processes and the spectral shape of the latter swept-source was far away from the Gaussian shape as required for OCT imaging.
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