Institute of Applied Physics, Russian Academy of Sciences, 46 Ulyanov Street, Nizhny Novgorod, 603950, Russia.
Phys Rev Lett. 2013 May 24;110(21):213903. doi: 10.1103/PhysRevLett.110.213903. Epub 2013 May 21.
We propose a technique to form a single few-cycle attosecond pulse from vacuum ultraviolet or extreme ultraviolet radiation via resonant interaction with hydrogenlike atoms, irradiated by a high-intensity far-off-resonant laser field. The laser field strongly perturbs excited atomic energy levels via the Stark effect and ionizes atoms from the excited states. We show that an isolated attosecond pulse can be formed using either a short incident femtosecond pulse of the resonant radiation or a steep front edge of the laser field. We propose an experimental realization of a single subfemtosecond pulse formation at 121.6 nm in atomic hydrogen and a single sub-100 as pulse formation at 13.5 nm in Li(2+) plasma.
我们提出了一种技术，通过与高强度远非共振激光场相互作用，从真空紫外或极紫外辐射中形成单个少周期阿秒脉冲，这些辐射被类氢原子吸收。激光场通过斯塔克效应强烈干扰激发原子能级，并使原子从激发态电离。我们表明，可以使用共振辐射的短入射飞秒脉冲或激光场的陡前沿来形成孤立的阿秒脉冲。我们提出了在原子氢中实现 121.6nm 处的单个亚飞秒脉冲形成和在 Li(2+)等离子体中实现 13.5nm 处的单个亚 100 阿秒脉冲形成的实验方案。
