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High-speed path-length scanning with a multiple-pass cavity delay line

机译:多通道腔延迟线的高速光程扫描

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Techniques for high-speed delay scanning are important for low-coherence interferometry, optical coherence tomography, pump probe measurements, and other applications. We demonstrate a novel scanning delay line using a multiple-pass cavity. Differential delays are accumulated with each pass so that millimeter delays can be generated with tens of micrometer mirror displacements. With special design criteria, misalignment sensitivity can be dramatically reduced. The system is demonstrated to scan 6 m/s at 2-kHz repetition rates. Real-time optical coherence tomography imaging with 500 pixel images at four frames/s is performed. Using a Cr:forsterite laser source, we obtained axial image resolutions of 6 μm with 92-dB sensitivity.
机译:高速延迟扫描技术对于低相干干涉测量,光学相干断层扫描,泵浦探头测量以及其他应用至关重要。我们演示了一种使用多次通过腔的新型扫描延迟线。每次通过都会累积微分延迟,因此数十微米的反射镜位移会产生毫米级延迟。采用特殊的设计标准,可以大大降低失准灵敏度。系统被证明以2 kHz的重复频率扫描6 m / s。使用四帧/秒的500个像素图像执行实时光学相干断层扫描成像。使用Cr:镁橄榄石激光源,我们获得了6μm的轴向图像分辨率,灵敏度为92dB。

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