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首页> 外文会议>Optical Coherence tomography and coherence domain optical methods in biomedicine XIX >The mid-infrared swept laser: life beyond OCT?
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The mid-infrared swept laser: life beyond OCT?

机译：中红外扫频激光器：OCT以外的生命？

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摘要

Near-infrared external cavity lasers with high tuning rates ("swept lasers") have come to dominate the field of near-infrared low-coherence imaging of biological tissues. Compared with time-domain OCT, swept-source OCT a) replaces slow mechanical scanning of a bulky reference mirror with much faster tuning of a laser cavity filter element and b) provides a×N(N being the number of axial pixels per A-scan) speed advantage with no loss of SNR. We will argue that this striking speed advantage has not yet been fully exploited within biophotonics but will next make its effects felt in the mid-infrared. This transformation is likely to be driven by recent advances in external cavity quantum cascade lasers, which are the mid-IR counterpart to the OCT swept-source. These mid-IR sources are rapidly emerging in the area of infrared spectroscopy. By noting a direct analogy between time-domain OCT and Fourier Transform Infrared (FTIR) spectroscopy we show analytically and via simulations that the mid-IR swept laser can acquire an infrared spectrum ×N (N being the number of spectral data points) faster than an FTIR instrument, using identical detected flux levels and identical receiver noise. A prototype external cavity mid-IR swept laser is demonstrated, offering a comparatively low sweep rate of 400 Hz over 60 cm~(-1) with 2 cm~(-1) linewidth, but which provides evidence that sweep rates of over a 100 kHz should be readily achievable simply by speeding up the cavity tuning element. Translating the knowledge and experience gained in near-IR OCT into mid-IR source development may result in sources offering significant benefits in certain spectroscopic applications.
机译：具有高调谐速率的近红外外腔激光器（“扫频激光器”）已成为生物组织近红外低相干成像领域的主导。与时域OCT相比，扫频OCT a）取代了笨重的参考镜的慢速机械扫描，而激光腔滤光片的调整速度更快，并且b）提供a×N（N是每A-的轴向像素数扫描）的速度优势，而不会损失SNR。我们将争辩说，这种惊人的速度优势尚未在生物光子学中得到充分利用，但接下来将在中红外光中感受到其效果。这种转变很可能是由外腔量子级联激光器的最新进展所驱动的，该激光器是OCT扫频光源的中红外对应物。这些中红外源在红外光谱学领域迅速兴起。通过注意到时域OCT和傅立叶变换红外（FTIR）光谱之间的直接类比，我们通过分析和仿真显示，中红外扫频激光器可以更快地获得红外光谱×N（N是光谱数据点的数量） FTIR仪器，使用相同的检测通量水平和相同的接收器噪声。演示了原型中腔外红外扫频激光器，其在60 cm〜（-1）的线宽为2 cm〜（-1）时提供了相对较低的400 Hz的扫频，但是提供了超过100的扫频的证据仅通过加快腔体调谐元件即可轻松实现kHz。将近红外OCT中获得的知识和经验转化为中红外光源开发，可能会导致某些光谱应用中的光源具有显着优势。

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  • 会议地点 San Francisco CA(US)
  • 作者

    DTD Childs; RA Hogg; DG Revin; IU Rehman; JW Cockburn; SJ Matcher;

  • 作者单位

    Department of Electrical and Electronic Engineering, University of Sheffield, Mappin Street, Sheffield, S3 1JD, UK;

    Department of Electrical and Electronic Engineering, University of Sheffield, Mappin Street, Sheffield, S3 1JD, UK;

    Department of Physics and Astronomy, Hicks Building, University of Sheffield, Hounsfield Road, Sheffield, S3 7RH, UK;

    Department of Materials Science and Engineering, The Kroto Building, University of Sheffield, Broad Lane, Sheffield, S3 7HQ, UK;

    Department of Physics and Astronomy, Hicks Building, University of Sheffield, Hounsfield Road, Sheffield, S3 7RH, UK;

    Department of Materials Science and Engineering, The Kroto Building, University of Sheffield, Broad Lane, Sheffield, S3 7HQ, UK;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    OCT; Infrared spectroscopy; FTIR; Fellgett advantage; swept lasers;

    机译：华侨城;红外光谱FTIR; Fellgett的优势；扫频激光器;

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