@inproceedings{83e1ebbb5e5248dda45d62d1cdab5fab,
title = "High-speed optical coherence tomography imaging with a tunable HCG-VCSEL light source at the 1060nm wavelength window",
abstract = "We present a high-speed swept-source optical coherence tomography (SS-OCT) imaging system using an electrically-pumped, micro-electromechanical-system (MEMS) tunable HCG-VCSEL operating at the 1060 nm wavelength regime. Comparing to existing MEMS VCSEL light sources for SS-OCT, a movable high-contrast grating (HCG) is used as the top mirror of the laser cavity, replacing the conventional distributed Bragg reflector mirror design. By applying a reverse bias voltage, the HCG mirror actuates downward toward the VCSEL cavity, changing the effective cavity length and resulting in wavelength tuning responses. The developed SS-OCT system allows an A-scan rate of 250 kHz, a detection sensitivity of 98 dB, and an axial imaging resolution of 22 µm (full-width at half-maximum (FWHM), in air). The A-scan rate can be further improved to 500 kHz if both the backward (long to short wavelength) and forward laser sweep are used. In the experimental setup, a dual-channel acquisition scheme was utilized to provide calibration of the OCT signal with a separate calibration interferometer. Volumetric imaging of the human fingernail/nail fold junction in vivo shows the feasibility of providing high-speed imaging of the tissue architectures. The MEMS tunable HCG-VCSEL light source can provide high-speed OCT imaging with a more compact light source footprint and potentially a lower cost.",
keywords = "High-contrast grating (HCG), High-speed imaging, MEMS, OCT, VCSEL, Wavelength sweeping",
author = "Tsai, {Ting Yen} and Chen, {Ting Hao} and Chen, {Hung Kai} and Chueh, {Chuan Bor} and Dalila Ellafi and Chris Chase and Kuo, {Hao Chung} and Tsai, {Meng Tsan} and Huang, {Michael C.Y.} and Lee, {Hsiang Chieh}",
note = "Publisher Copyright: {\textcopyright} 2022 SPIE; Vertical-Cavity Surface-Emitting Lasers XXVI 2022 ; Conference date: 20-02-2022 Through 24-02-2022",
year = "2022",
doi = "10.1117/12.2608803",
language = "English",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
publisher = "SPIE",
editor = "Chun Lei and Choquette, {Kent D.} and Graham, {Luke A.}",
booktitle = "Vertical-Cavity Surface-Emitting Lasers XXVI",
address = "美國",
}