Hydrodynamic optically-field-ionized (HOFI) plasma channels up to long are investigated. Optical guiding is demonstrated of laser pulses with a peak input intensity of $\SI{6E17}{W.cm^{-2}}$ through long plasma channels with on-axis densities measured interferometrically to be as low as $n_{e0} = \SI[separate-uncertainty=true]{1.0(3)e17}{cm^{-3}}$. Guiding is also observed at lower axial densities, which are inferred from magneto-hydrodynamic simulations to be approximately $\SI{7e16}{cm^{-3}}$. Measurements of the power attenuation lengths of the channels are shown to be in good agreement with those calculated from the measured transverse electron density profiles. To our knowledge, the plasma channels investigated in this work are the longest, and have the lowest on-axis density, of any free-standing waveguide demonstrated to guide laser pulses with intensities above $>\SI{E17}{W.cm^{-2}}$.

中文翻译：

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在100毫米长的流体动力学光场电离等离子体通道中引导高强度激光脉冲

研究了长达水力的光动力电离（HOFI）等离子体通道。通过较长的等离子通道，通过干涉法测得的轴向密度低至$ n_ {e0低，证明了激光脉冲的峰值输入强度为$ \ SI {6E17} {W.cm ^ {-2}} $ } = \ SI [separate-unertainty = true] {1.0（3）e17} {cm ^ {-3}} $。在较低的轴向密度下也观察到了导向，这是从磁流体动力学模拟推断出来的，约为$ \ SI {7e16} {cm ^ {-3}} $。通道功率衰减长度的测量结果与从测得的横向电子密度曲线计算得出的结果非常一致。据我们所知，这项工作中研究的等离子体通道是任何独立的波导中最长的，且轴上密度最低，这些波导被证明可以引导强度大于$> \ SI {E17} {W.cm ^ {-2}} $。