Milosevic Nenad, Scrinzi Armin, Brabec Thomas
Institut für Photonik, Technische Universität Wien, Gusshausstrasse 27/387, A-1040 Vienna, Austria.
Phys Rev Lett. 2002 Mar 4;88(9):093905. doi: 10.1103/PhysRevLett.88.093905. Epub 2002 Feb 19.
A numerical simulation of attosecond harmonic pulse generation in a three-dimensional field-ionizing gas is presented. Calculated harmonic efficiencies quantitatively reproduce experimental findings. This allows a quantitative characterization of attosecond pulse generation revealing information currently not accessible by experiment. The rapid phase variation and spatiotemporal distortions of harmonics are smaller than anticipated, allowing focusing of 30-nm, 750-as pulses to intensities in excess of 10(13) W/cm(2). Feasibility of such pulses brings novel applications such as extreme ultraviolet nonlinear optics and attosecond pump probe spectroscopy within reach.
本文给出了三维场致电离气体中阿秒谐波脉冲产生的数值模拟。计算得到的谐波效率定量地再现了实验结果。这使得对阿秒脉冲产生进行定量表征成为可能，揭示了目前实验无法获得的信息。谐波的快速相位变化和时空畸变比预期的要小，使得30纳米、750阿秒的脉冲能够聚焦到超过10(13)瓦/平方厘米的强度。这种脉冲的可行性使得诸如极紫外非线性光学和阿秒泵浦探测光谱学等新应用成为可能。
