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Reconfigurable time stretched swept laser source with up to 100 MHz swept rate, 100 nm bandwidth and 100 mm OCT imaging depth
Photonics Research ( IF 7.6 ) Pub Date : 2020-07-23 , DOI: 10.1364/prj.390076
Dongmei Huang , Feng Li , Chao Shang , Zihao Cheng , P. K. A. Wai

The sweep rate, sweep range, and coherence length of swept sources, respectively, determine the acquisition rate, axial resolution, and imaging range of optical coherence tomography (OCT). In this paper, we demonstrate a reconfigurable high-speed and broadband swept laser by time stretching of a flat spectrum femtosecond pulse train with over 100 nm bandwidth and a repetition rate of 100 MHz. By incorporating an optical modulator and utilizing appropriate dispersive modules, the reconfiguration of the swept source is demonstrated with sweep rates of 25 and 2.5 MHz. The 2.5 MHz swept source enables an imaging range of >110 mm with 6 dB sensitivity roll-off in OCT, which is the longest imaging range ever reported for megahertz OCT.

中文翻译:

具有高达 100 MHz 扫描速率、100 nm 带宽和 100 mm OCT 成像深度的可重构时间拉伸扫描激光源

扫描源的扫描速率、扫描范围和相干长度分别决定了光学相干断层扫描 (OCT) 的采集速率、轴向分辨率和成像范围。在本文中,我们通过对带宽超过 100 nm 且重复频率为 100 MHz 的平坦光谱飞秒脉冲序列进行时间展宽,展示了一种可重构的高速宽带扫频激光器。通过结合光调制器并利用适当的色散模块,可以以 25 和 2.5 MHz 的扫描速率演示扫描源的重新配置。2.5 MHz 扫频源可实现 >110 mm 的成像范围,OCT 中的灵敏度滚降为 6 dB,这是有史以来报告的兆赫 OCT 最长成像范围。
更新日期:2020-07-23
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