High-speed optical coherence tomography imaging with a tunable HCG-VCSEL light source at the 1060nm wavelength window

Ting Yen Tsai, Ting Hao Chen, Hung Kai Chen, Chuan Bor Chueh, Dalila Ellafi, Chris Chase, Hao Chung Kuo, Meng Tsan Tsai, Michael C.Y. Huang, Hsiang Chieh Lee*

*此作品的通信作者

研究成果: Conference contribution同行評審

摘要

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.

原文English
主出版物標題Vertical-Cavity Surface-Emitting Lasers XXVI
編輯Chun Lei, Kent D. Choquette, Luke A. Graham
發行者SPIE
ISBN(電子)9781510649118
DOIs
出版狀態Published - 2022
事件Vertical-Cavity Surface-Emitting Lasers XXVI 2022 - Virtual, Online
持續時間: 20 2月 202224 2月 2022

出版系列

名字Proceedings of SPIE - The International Society for Optical Engineering
12020
ISSN(列印)0277-786X
ISSN(電子)1996-756X

Conference

ConferenceVertical-Cavity Surface-Emitting Lasers XXVI 2022
城市Virtual, Online
期間20/02/2224/02/22

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