Schmid K, Veisz L, Tavella F, Benavides S, Tautz R, Herrmann D, Buck A, Hidding B, Marcinkevicius A, Schramm U, Geissler M, Meyer-Ter-Vehn J, Habs D, Krausz F
Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Strasse 1, 85748 Garching, Germany.
Phys Rev Lett. 2009 Mar 27;102(12):124801. doi: 10.1103/PhysRevLett.102.124801. Epub 2009 Mar 26.
We report on an electron accelerator based on few-cycle (8 fs full width at half maximum) laser pulses, with only 40 mJ energy per pulse, which constitutes a previously unexplored parameter range in laser-driven electron acceleration. The produced electron spectra are monoenergetic in the tens-of-MeV range and virtually free of low-energy electrons with thermal spectrum. The electron beam has a typical divergence of 5-10 mrad. The accelerator is routinely operated at 10 Hz and constitutes a promising source for several applications. Scalability of the few-cycle driver in repetition rate and energy implies that the present work also represents a step towards user friendly laser-based accelerators.
我们报道了一种基于少周期(半高全宽8飞秒)激光脉冲的电子加速器,每个脉冲能量仅为40毫焦,这构成了激光驱动电子加速中一个此前未被探索的参数范围。所产生的电子能谱在几十兆电子伏特范围内是单能的,并且几乎没有具有热谱的低能电子。电子束的典型发散角为5 - 10毫弧度。该加速器通常以10赫兹运行,是几种应用的有前景的源。少周期驱动源在重复频率和能量方面的可扩展性意味着本工作也代表了迈向用户友好型激光加速器的一步。