Choma Michael A, Hsu Kevin, Izatt Joseph A
Duke University, Department of Biomedical Engineering, 136 Hudson Hall, Durham, North Carolina 27708, USA.
J Biomed Opt. 2005 Jul-Aug;10(4):44009. doi: 10.1117/1.1961474.
The increased sensitivity of spectral domain optical coherence tomography (OCT) has driven the development of a new generation of technologies in OCT, including rapidly tunable, broad bandwidth swept laser sources and spectral domain OCT interferometer topologies. In this work, the operation of a turnkey 1300-nm swept laser source is demonstrated. This source has a fiber ring cavity with a semiconductor optical amplifier gain medium. Intracavity mode selection is achieved with an in-fiber tunable fiber Fabry-Perot filter. A novel optoelectronic technique that allows for even sampling of the swept source OCT signal in k space also is described. A differential swept source OCT system is presented, and images of in vivo human cornea and skin are presented. Lastly, the effects of analog-to-digital converter aliasing on image quality in swept source OCT are discussed.
光谱域光学相干断层扫描（OCT）灵敏度的提高推动了新一代OCT技术的发展，包括快速可调谐、宽带扫频激光源和光谱域OCT干涉仪拓扑结构。在这项工作中，展示了一种交钥匙式1300纳米扫频激光源的运行情况。该光源具有一个带有半导体光放大器增益介质的光纤环形腔。通过光纤内可调谐光纤法布里-珀罗滤波器实现腔内模式选择。还描述了一种新颖的光电技术，该技术允许在k空间中对扫频源OCT信号进行均匀采样。提出了一种差分扫频源OCT系统，并展示了体内人角膜和皮肤的图像。最后，讨论了模数转换器混叠对扫频源OCT图像质量的影响。
