论文标题
中性气通道中相对论激光脉冲的自波引导
Self-waveguiding of relativistic laser pulses in neutral gas channel
论文作者
论文摘要
我们证明，通过在繁殖时产生自己的等离子体波导，可以在准备好的中性氢通道中的数百个雷利范围内传播数百个雷利范围的超舒服。脉冲的前部会产生一个限制其余脉冲的波导。广泛的合适初始索引结构将支持此“自波”过程；必要的特征是轴上的气体密度最小。在这里，我们演示了至少$ 1.5 \ times10^{17} w/cm^2 $的脉冲自动引导（归一化矢量电位$ a_0 \ sim0.3）$超过10厘米，或$ \ sim100 $ rayleigh ranges，仅受我们的激光和燃气射击的长度限制。我们预测并观察到与自波指导过程中模式相对应的特征振荡。自动引导的脉冲在其唤醒中留下了完全离子的低密度等离子体波导，该脉冲可以引导紧随其后的另一个脉冲。我们证明了这种后续探针脉冲的光学指导
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
