Evidence of Resonant Surface-Wave Excitation in the Relativistic Regime through Measurements of Proton Acceleration from Grating Targets
Evidence of Resonant Surface-Wave Excitation in the Relativistic Regime through Measurements of Proton Acceleration from Grating Targets
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DOI：
10.1103/physrevlett.111.185001
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发表时间：
2013-10-28
影响因子：
8.6
通讯作者：
Macchi, A.
中科院分区：
文献类型：
--
作者：
Ceccotti, T.;Floquet, V.;Macchi, A.
实验研究了激光脉冲与表面具有周期性沟槽的薄光栅靶的相互作用。超高对比度（类似于10（12））脉冲使我们能够在相对论范围内第一次证明增强的激光-靶耦合，其强度大于10（19）W/cm（2）。由目标正常鞘加速产生的质子的截止能量的2.5倍的最大增加被观察到相对于平面目标，周围的入射角预期的表面波的共振激发。一个显着的增强也观察到小角度的入射，共振。
The interaction of laser pulses with thin grating targets, having a periodic groove at the irradiated surface, is experimentally investigated. Ultrahigh contrast (similar to 10(12)) pulses allow us to demonstrate an enhanced laser-target coupling for the first time in the relativistic regime of ultrahigh intensity >10(19) W/cm(2). A maximum increase by a factor of 2.5 of the cutoff energy of protons produced by target normal sheath acceleration is observed with respect to plane targets, around the incidence angle expected for the resonant excitation of surface waves. A significant enhancement is also observed for small angles of incidence, out of resonance.