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Flying focus: Spatial and temporal control of intensity for laser-based applications

机译：飞行重点：基于激光应用的强度空间和时间控制

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摘要

An advanced focusing scheme, called a "flying focus," uses a chromatic focusing system combined with a broadband laser pulse with its colors arranged in time to propagate a high intensity focus over a distance that can be much greater than its Rayleigh length while decoupling the speed at which the peak intensity propagates from its group velocity. The flying focus generates a short effective pulse duration with a small diameter focal spot that co- or counter-propagates along the optical axis at any velocity. Experiments validating the concept measured subluminal (-0.09c) to superluminal (39c) focal spot velocities with a nearly constant peak intensity over 4.5 mm. Experiments that increased the peak intensity above the ionization threshold for gas demonstrated ionization waves propagating at the velocity of the flying focus. These ionization waves of any velocity overcome several laser-plasma propagation issues, including ionization-induced refraction. The flying focus presents opportunities to overcome current fundamental limitations in laser-plasma amplifiers, laser wakefield accelerators, photon accelerators, and high-order frequency conversion. Published under license by AIP Publishing.
机译：一种先进的聚焦方案，称为“飞行焦点”，使用了色彩聚焦系统与宽带激光脉冲相结合，其颜色及时布置在距离上的距离上的高强度聚焦，同时解耦的距离远远超过其瑞利长度峰值强度从其组速度传播的速度。飞行焦点产生短的有效脉冲持续时间，该脉冲持续时间具有小直径焦点，其在任何速度下沿光轴共传播。将测量的概念（-0.09℃）验证到超级峰值（39℃）焦斑速度的实验，其几乎恒定的峰强度超过4.5mm。在对气体的电离阈值上方增加的实验表明在飞行焦点的速度下传播的电离波。这些离子化波的任何速度克服了几种激光等离子体传播问题，包括电离诱导的折射。飞行焦点提出了克服激光等离子放大器，激光韦克菲尔德促进剂，光子加速器和高阶频率转换的基本限制的机会。通过AIP发布在许可证下发布。

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  • 来源
    《Physics of plasmas》 |2019年第3期|共9页
  • 作者

    Froula D. H.; Palastro J. P.; Turnbull D.; Davies A.; Nguyen L.; Howard A.; Ramsey D.; Franke P.; Bahk S. -W.; Begishev I. A.; Boni R.; Bromage J.; Bucht S.; Follett R. K.; Haberberger D.; Jenkins G. W.; Katz J.; Kessler T. J.; Shaw J. L.; Vieira J.;

  • 作者单位

    Univ Rochester Lab Laser Energet Rochester NY 14623 USA;

    Univ Rochester Lab Laser Energet Rochester NY 14623 USA;

    Univ Rochester Lab Laser Energet Rochester NY 14623 USA;

    Univ Rochester Lab Laser Energet Rochester NY 14623 USA;

    Univ Rochester Lab Laser Energet Rochester NY 14623 USA;

    Univ Rochester Lab Laser Energet Rochester NY 14623 USA;

    Univ Rochester Lab Laser Energet Rochester NY 14623 USA;

    Univ Rochester Lab Laser Energet Rochester NY 14623 USA;

    Univ Rochester Lab Laser Energet Rochester NY 14623 USA;

    Univ Rochester Lab Laser Energet Rochester NY 14623 USA;

    Univ Rochester Lab Laser Energet Rochester NY 14623 USA;

    Univ Rochester Lab Laser Energet Rochester NY 14623 USA;

    Univ Rochester Lab Laser Energet Rochester NY 14623 USA;

    Univ Rochester Lab Laser Energet Rochester NY 14623 USA;

    Univ Rochester Lab Laser Energet Rochester NY 14623 USA;

    Univ Rochester Lab Laser Energet Rochester NY 14623 USA;

    Univ Rochester Lab Laser Energet Rochester NY 14623 USA;

    Univ Rochester Lab Laser Energet Rochester NY 14623 USA;

    Univ Rochester Lab Laser Energet Rochester NY 14623 USA;

    Univ Lisbon Inst Super Tecn CoLP Inst Plasmas &

    Fusao Nucl Lisbon Portugal;

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  • 正文语种 eng
  • 中图分类 等离子体物理学;
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