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首页> 外文会议>High-Speed Biomedical Imaging and Spectroscopy III: Toward Big Data Instrumentation and Management >Plasma plume expansion dynamics in nanosecond Nd:YAG laserosteotome
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Plasma plume expansion dynamics in nanosecond Nd:YAG laserosteotome

机译：纳秒Nd：YAG激光骨刀切开仪中的等离子羽流膨胀动力学

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摘要

In minimal invasive laser osteotomy precise information about the ablation process can be obtained with LIBS in order to avoid carbonization, or cutting of wrong types of tissue. Therefore, the collecting fiber for LIBS needs to be optimally placed in narrow cavities in the endoscope. To determine this optimal placement, the plasma plume expansion dynamics in ablation of bone tissue by the second harmonic of a nanosecond Nd:YAG laser at 532 nm has been studied. The laser-induced plasma plume was monitored in different time delays, from one nanosecond up to one hundred microseconds. Measurements were performed using high-speed gated illumination imaging. The expansion features were studied using illumination of the overall visible emission by using a gated intensified charged coupled device (ICCD). The camera was capable of having a minimum gate width (Optical FWHM) of 3 ns and the timing resolution (minimum temporal shift of the gate) of 10 ps. The imaging data were used to generate position-time data of the luminous plasma-front. Moreover, the velocity of the plasma plume expansion was studied based on the time-resolved intensity data. By knowing the plasma plume profile over time, the optimum position (axial distance from the laser spot) of the collecting fiber and optimal time delay (to have the best signal to noise ratio) in spatial-resolved and time-resolved laser-induced breakdown spectroscopy (LIBS) can be determined. Additionally, the function of plasma plume expansion could be used to study the shock wave of the plasma plume.
机译：在微创激光截骨术中，可以使用LIBS获得有关消融过程的精确信息，以避免碳化或切割错误类型的组织。因此，需要将用于LIBS的收集纤维最佳地放置在内窥镜中的狭窄空腔中。为了确定该最佳位置，已经研究了纳秒级Nd：YAG激光在532 nm处的二次谐波对骨组织消融中血浆羽流膨胀动力学的影响。激光诱导的等离子体羽流以从1纳秒到100微秒的不同时间延迟进行监控。使用高速门控照明成像进行测量。通过使用门控增强电荷耦合器件（ICCD）对整个可见光进行照明来研究膨胀特性。该摄像机的最小栅极宽度（光学FWHM）为3 ns，时序分辨率（最小栅极时间偏移）为10 ps。成像数据用于生成发光等离子体前缘的位置时间数据。此外，基于时间分辨强度数据研究了等离子体羽流膨胀的速度。通过了解随时间变化的等离子体羽状轮廓，可以在空间分辨和时间分辨的激光诱导击穿中，收集光纤的最佳位置（距激光点的轴向距离）和最佳时间延迟（具有最佳信噪比）光谱法（LIBS）可以确定。另外，等离子羽流膨胀的功能可以用来研究等离子羽流的冲击波。

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  • 会议地点 San Francisco(US)
  • 作者

    Hamed Abbasi; Georg Rauter; Raphael Guzman; Philippe C. Cattin; Azhar Zam;

  • 作者单位

    Biomedical Laser and Optics Group, Department of Biomedical Engineering, University of Basel,Gewerbestrasse 14, CH-4123 Allschwil, Switzerland;

    Bio-Inspired RObots for Medicine-Lab., Department of Biomedical Engineering, University of Basel, Gewerbestrasse 14, CH-4123 Allschwil, Switzerland;

    Department of Neurosurgery, University Hospital Basel, Spitalstrasse 21, CH-4056 Basel,Switzerland;

    Center for medical Image Analysis and Navigation, Department of Biomedical Engineering,University of Basel, Gewerbestrasse 14, CH-4123 Allschwil, Switzerland;

    Biomedical Laser and Optics Group, Department of Biomedical Engineering, University of Basel,Gewerbestrasse 14, CH-4123 Allschwil, Switzerland;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Fast photography; time-resolved; plasma plume; laserosteotome;

    机译：快速摄影；时间解决等离子羽激光骨刀;

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