相对论性laser脉冲在中性气体通道中的自波导
Self-waveguiding of relativistic laser pulses in neutral gas channel
摘要：
我们证明，超短高强度激光脉冲可以传播数百个瑞利范围内的准备中性氢通道通过产生自己的等离子体波导，因为它传播;脉冲的前面产生的波导，限制其余的脉冲。大范围的合适的初始折射率结构将支持这种“自波导”过程;必要的特征是轴上的气体密度是最小的。在这里，我们证明了自波导的脉冲至少$1.5\times10^{17} W/cm^2$（归一化矢量势$a_0\sim0.3)$超过10厘米，或$\sim100$瑞利范围，仅限于我们的激光能量和我们的气体射流的长度。我们预测和观察的特征振荡对应的模式拍在自波导。自波导脉冲在其尾流中留下一个完全电离的低密度等离子体波导，该波导可以引导紧随其后注入的另一个脉冲;我们演示了这种后续探测脉冲的光学引导
英文摘要：
We demonstrate that an ultrashort high intensity laser pulse can propagate for hundreds of Rayleigh ranges in a prepared neutral hydrogen channel by generating its own plasma waveguide as it propagates; the front of the pulse generates a waveguide that confines the rest of the pulse. A wide range of suitable initial index structures will support this "self-waveguiding" process; the necessary feature is that the gas density on axis is a minimum. Here, we demonstrate self-waveguiding of pulses of at least $1.5\times10^{17} W/cm^2$ (normalized vector potential $a_0\sim0.3)$ over 10 cm, or $\sim100$ Rayleigh ranges, limited only by our laser energy and length of our gas jet. We predict and observe characteristic oscillations corresponding to mode-beating during self-waveguiding. The self-waveguiding pulse leaves in its wake a fully ionized low density plasma waveguide which can guide another pulse injected immediately following; we demonstrate optical guiding of such a follow-on probe pulse
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