Lavocat-Dubuis X, Matte J-P
INRS-Energie, Matériaux et Télécommunications, Varennes, Québec, Canada J3X 1S2.
Phys Rev E Stat Nonlin Soft Matter Phys. 2009 Nov;80(5 Pt 2):055401. doi: 10.1103/PhysRevE.80.055401. Epub 2009 Nov 10.
The interaction of a femtosecond relativistic intensity laser pulse with a grating of subwavelength periodicity was simulated numerically. Strong coherent emission at the wavelength of the grating period and its harmonics was seen, nearly parallel to the target surface, due to relativistic electron bunches emanating from each protuberance. Normal and oblique incidence (30 degrees ) gave rise to trains of attosecond pulses and an efficiency greater than 10;{-4} was obtained for the 24;{th} harmonic (lambda approximately 16.7 nm) . Similarity theory gives optimum conditions for harmonic emission.
对飞秒相对论强度激光脉冲与亚波长周期光栅的相互作用进行了数值模拟。由于每个凸起处产生的相对论电子束，在与目标表面近乎平行的方向上，观察到了在光栅周期波长及其谐波处的强相干发射。垂直入射和斜入射（30度）产生了阿秒脉冲序列，对于第24谐波（波长约为16.7纳米），获得了大于10^{-4}的效率。相似性理论给出了谐波发射的最佳条件。
