Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany.
Phys Rev Lett. 2011 Oct 21;107(17):173402. doi: 10.1103/PhysRevLett.107.173402. Epub 2011 Oct 19.
We demonstrate ultrafast resonant energy absorption of rare-gas doped He nanodroplets from intense few-cycle (~10 fs) laser pulses. We find that less than 10 dopant atoms "ignite" the droplet to generate a nonspherical electronic nanoplasma resulting ultimately in complete ionization and disintegration of all atoms, although the pristine He droplet is transparent for the laser intensities applied. Our calculations at those intensities reveal that the minimal pulse length required for ignition is about 9 fs.
我们展示了稀有气体掺杂氦纳米液滴对强飞秒（~10 fs）激光脉冲的超快共振能量吸收。我们发现，不到 10 个掺杂原子“点燃”液滴，产生非球形的电子纳米等离子体，最终导致所有原子完全电离和分解，尽管原始的氦液滴对所施加的激光强度是透明的。我们在这些强度下的计算表明，点火所需的最小脉冲长度约为 9 fs。
