• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>ICO20: Optical Devices and Instruments >The application of fiber-coupling zig-zag beam deflection method on the investigation of plasma shock waves
【24h】

The application of fiber-coupling zig-zag beam deflection method on the investigation of plasma shock waves

机译：光纤耦合之字形偏转法在等离子体激波研究中的应用

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A novel method, namely, fiber-coupling zig-zag beam deflection method has been proposed to investigate the attenuation of plasma shock waves in air in this paper. The main innovation of this method is to use a zig-zag laser beam as the probing beam, instead of a straight beam in traditional beam deflection method. The zig-zag beam is formed by eight times successive reflections on a pair of parallel mirrors. Shock waves propagate through the space between two mirrors which contains nine zigzags in the horizontal plane. This space can be designated as the testing field. After the probing beam leaves the testing field, it is coupled into a single mode optical fiber which guides the beam into a photomultiplier to complete the process of photoelectrical conversion. Plasma shock waves are generated during laser ablation of Fe target in air. The laser used in our experiment is a Q-switched Nd: YAG laser operating at wavelength of 1064nm and pulse width (FWHM) of 7ns. The output of 160mJ/pulse of this laser is focused on the surface of the target which is far exceeds the ablation threshold of Fe. When a shock wave propagates in the testing field, it will meet the zig-zag probing beam nine times one after another. Correspondingly, nine deflection signals will be induced by the perturbations of the shock wave, which can be utilized to illuminate the propagating behavior of the shock wave. The whole attenuation process of the shock wave can be demonstrated intuitively only through one experimental curve with the nine deflection signals. From the curve, the average velocity of the shock wave can be calculated out with high and reliable precision. It is found that shock waves attenuate into acoustic waves within 10mm in air because of the inhalement of environmental media. The development of this novel optical technology provides a powerful tool for the detection of shock wave propagation and riches diagnostic methods of shock waves.
机译：为了研究等离子体冲击波在空气中的衰减，提出了一种新的方法，即光纤耦合之字形束偏转方法。该方法的主要创新之处在于使用之字形激光束作为探测光束，而不是传统光束偏转方法中的直光束。之字形光束由一对平行反射镜上的八次连续反射形成。冲击波通过两个镜之间的空间传播，该镜在水平面中包含九个之字形。该空间可以指定为测试字段。探测光束离开测试场后，将其耦合到单模光纤中，该光纤将光束引导到光电倍增管中以完成光电转换过程。在空气中Fe靶的激光烧蚀过程中会产生等离子体冲击波。我们实验中使用的激光器是Q开关Nd：YAG激光器，其波长为1064nm，脉冲宽度（FWHM）为7ns。该激光的160mJ /脉冲的输出聚焦在远远超过Fe的烧蚀阈值的靶的表面上。当冲击波在测试场中传播时，它将相继九次遇到锯齿形探测光束。相应地，冲击波的扰动将引起九个偏转信号，这些偏转信号可用于阐明冲击波的传播行为。冲击波的整个衰减过程只能通过一条带有9个偏转信号的实验曲线直观地展示出来。根据该曲线，可以高精度且可靠地算出冲击波的平均速度。发现由于环境介质的破坏，冲击波在空气中衰减为10mm以内的声波。这种新型光学技术的发展为检测冲击波的传播和丰富的冲击波诊断方法提供了强大的工具。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号