用轴锥透镜产生低密度流体动力学光场电离等离子体通道
Low-Density Hydrodynamic Optical-Field-Ionized Plasma Channels Generated With An Axicon Lens
摘要：
我们演示了高强度激光脉冲在长的、低密度流体动力学光场电离（HOFI）等离子体通道中的光引导。轴棱锥透镜用于产生具有低至$n_e(0) = 1.5\times 10^{17}\, \mathrm{cm}^{-3}$的轴上电子密度和在$ 20 μ\mathrm{m} \lesssim W_M \lesssim 40 μ\mathrm{m}$范围内的匹配光斑尺寸的HOFI等离子体通道。这些通道参数的控制，通过调整的初始细胞的压力和延迟后的通道形成脉冲的到来被证明。对于峰值轴向强度为$4 \times 10^{17}\, \mathrm{W\,cm}^{-2}$的激光脉冲，在5 Hz的脉冲重复率下实现了在超过14个瑞利范围内的高度可再现的高质量引导，这受到可用的通道形成激光器和真空泵浦系统的限制。这种类型的等离子体通道似乎非常适合于多GeV激光尾场加速器在准线性制度。
英文摘要：
We demonstrate optical guiding of high-intensity laser pulses in long, low density hydrodynamic optical-field-ionized (HOFI) plasma channels. An axicon lens is used to generate HOFI plasma channels with on-axis electron densities as low as $n_e(0) = 1.5\times 10^{17}\, \mathrm{cm}^{-3}$ and matched spot sizes in the range $ 20 μ\mathrm{m} \lesssim W_M \lesssim 40 μ\mathrm{m}$. Control of these channel parameters via adjustment of the initial cell pressure and the delay after the arrival of the channel-forming pulse is demonstrated. For laser pulses with a peak axial intensity of $4 \times 10^{17}\, \mathrm{W\,cm}^{-2}$, highly reproducible, high-quality guiding over more than 14 Rayleigh ranges is achieved at a pulse repetition rate of 5 Hz, limited by the available channel-forming laser and vacuum pumping system. Plasma channels of this type would seem to be well suited to multi-GeV laser wakefield accelerators operating in the quasi-linear regime.
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