Galletti M, Bisesto F G, Anania M P, Ferrario M, Pompili R, Poyé A, Zigler A
Opt Lett. 2020 Aug 15;45(16):4420-4423. doi: 10.1364/OL.393503.
High-intensity ultrashort laser pulses interacting with thin solid targets are able to produce energetic ion beams by means of extremely large accelerating fields set by the energetic ejected electrons. The characterization of such electrons is thus important in view of a complete understanding of the acceleration process. Here, we present a complete temporal-resolved characterization of the fastest escaping hot electron component for different target materials and thicknesses, using temporal diagnostics based on electro-optical sampling with 100 fs temporal resolution. Experimental evidence of scaling laws for ultrafast electron beam parameters have been retrieved with respect to the impinging laser energy (0.4-4 J range) and to the target material, and an empirical law determining the beam parameters as a function of the target thickness is presented.
高强度超短激光脉冲与薄固体靶相互作用时，能够借助高能喷射电子所产生的极大加速场来产生高能离子束。因此，鉴于对加速过程的全面理解，对这类电子进行表征很重要。在此，我们利用基于电光采样的时间诊断方法，以100飞秒的时间分辨率，针对不同靶材料和厚度，给出了最快逃逸热电子成分的完整时间分辨表征。已获取了超快电子束参数关于入射激光能量（0.4 - 4焦耳范围）和靶材料的标度律的实验证据，并给出了一个根据靶厚度确定束参数的经验定律。
