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首页> 外文会议>Conference on Coherence Domain Optical Methods in Biomedical Science and Clinical Applications Ⅵ Jan 21-23, 2002 San Jose, USA >Sub-Microsecond Speed Optical Coherence Tomography System Design and Analysis Using Acousto-Optics
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Sub-Microsecond Speed Optical Coherence Tomography System Design and Analysis Using Acousto-Optics

机译：使用声光的亚微秒速光学相干层析成像系统设计和分析

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摘要

We introduce a novel high speed no moving parts optical coherence tomography (OCT) system that acquires sample data at less than a microsecond/data point sampling rate. The basic principle of the proposed OCT system relies on using an acousto-optic deflector (AOD). This OCT system has the attractive features of an acousto-optic scanning heterodyne interferometer coupled with an acousto-optic variable optical delay line (ODL) operating in a reflective mode. Fundamentally, OCT systems use a broadband light source for high axial resolution inside the sample or living tissue under examination. Inherently, acousto-optic (AO) devices are Bragg-mode wavelength sensitive elements. In this paper, we identify that Bragg cell generated two beams naturally have an unbalanced and orthogonal spectrum with respect to each other. This mismatch in spectrums inturn violates the ideal auto-correlation condition for a high signal-to-noise ratio broadband interferometric sensor such as OCT. We solve this fundamental limitation of Bragg cell use for OCT by deploying a new interferometric architecture where the two interfering beams have the same power spectral profile over the bandwidth of the broadband source. With the proposed acousto-optic based system, high (e.g., MHz) intermediate frequency can be generated for low 1/f noise heterodyne detection. System issues such as resolution, number of axial scans, and delay-path selection time are addressed. Experiments described demonstrate our high speed acousto-optically tuned OCT system where optical delay lines can be selected at sub-microsecond speeds.
机译：我们介绍了一种新颖的高速无运动部件光学相干断层扫描（OCT）系统，该系统以小于1微秒/数据点的采样率获取样本数据。提出的OCT系统的基本原理依赖于使用声光偏转器（AOD）。该OCT系统具有声光扫描外差干涉仪与以反射模式工作的声光可变光学延迟线（ODL）耦合的吸引人的特征。从根本上说，OCT系统使用宽带光源在被检样品或活组织内部实现高轴向分辨率。本质上，声光（AO）器件是布拉格模式波长敏感元件。在本文中，我们确定布拉格电池产生的两个光束自然具有彼此不平衡且正交的光谱。频谱的这种不匹配反过来违反了高信噪比宽带干涉传感器（如OCT）的理想自相关条件。我们通过部署一种新的干涉测量体系结构来解决Bragg电池用于OCT的这一基本局限性，其中两个干涉光束在宽带源的带宽上具有相同的功率谱分布。利用所提出的基于声光的系统，可以产生高（例如，MHz）中频以用于低1 / f噪声外差检测。解决了系统问题，如分辨率，轴向扫描次数和延迟路径选择时间。所描述的实验演示了我们的高速声光调谐OCT系统，其中可以以亚微秒的速度选择光学延迟线。

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