Abstract
We demonstrate a high-speed swept-source optical coherence tomography (SS-OCT) system, which is based on a high-speed swept light source and a Mach-Zehnder interferometer with a high-speed photodetector. The light source is an external-cavity laser tuned by a KTN electro-optic deflector, which exhibits a very fast response and large deflection. The scanning wavelength range is almost 80 nm up to 200 kHz with a ±400-V deflector driving voltage. The system acquires 1 mm × 1 mm images consisting of 200 × 200 pixels within few milliseconds. We present preliminary SS-OCT images of an in-vitro human nail and an in-vivo finger pad.
Highlights
Optical coherence tomography using a swept light source (SS-OCT), a laser interferometry technique that can acquire cross-sectional images of tissue and other scattering materials with micrometer-resolution, is attractive for biomedical applications [1,2]
We demonstrate a high-speed swept-source optical coherence tomography (SS-OCT) system, which is based on a highspeed swept light source and a Mach-Zehnder interferometer with a high-speed photodetector
The light source is an external-cavity laser tuned by a KTN electro-optic deflector, which exhibits a very fast response and large deflection
Summary
Optical coherence tomography using a swept light source (SS-OCT), a laser interferometry technique that can acquire cross-sectional images of tissue and other scattering materials with micrometer-resolution, is attractive for biomedical applications [1,2]. As the repetition rate of the light sources is increased, the duration of the laser irradiation decreases and the quantity of data obtained within a fixed measurement duration increases [4]. Far, such light sources have used mechanical actuators for wavelength scanning [5,6]. Taking the advantages of the swept light source using the KTN deflector into consideration, with the aim of advanced image rendering while minimizing the blur caused by bodily movement, we are developing a highspeed SS-OCT system using the light source. Preliminary OCT images of a human nail and finger pad are presented
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