Kinsler P, Radnor S B P, Tyrrell J C A, New G H C
Blackett Laboratory, Imperial College London, Prince Consort Road, London SW7 2BW, United Kingdom.
Phys Rev E Stat Nonlin Soft Matter Phys. 2007 Jun;75(6 Pt 2):066603. doi: 10.1103/PhysRevE.75.066603. Epub 2007 Jun 7.
Carrier wave shocking is studied using the pseudospectral spatial-domain (PSSD) technique. We describe the shock detection diagnostics necessary for this numerical study and verify them against theoretical shocking predictions for the dispersionless case. These predictions show a carrier envelope phase and pulse bandwidth sensitivity in the single-cycle regime. The flexible dispersion management offered by the PSSD enables us to independently control the linear and nonlinear dispersion. Customized dispersion profiles allow us to analyze the development of both carrier self-steepening and shocks. The results exhibit a marked asymmetry between normal and anomalous dispersion, both in the limits of the shocking regime and in the (near) shocked pulse wave forms. Combining these insights, we offer some suggestions on how carrier shocking (or at least extreme self-steepening) might be realized experimentally.
利用伪谱空间域(PSSD)技术对载波冲击进行了研究。我们描述了该数值研究所需的冲击检测诊断方法,并将其与无色散情况下的理论冲击预测进行了验证。这些预测表明,在单周期 regime 中存在载波包络相位和脉冲带宽敏感性。PSSD 提供的灵活色散管理使我们能够独立控制线性和非线性色散。定制的色散分布使我们能够分析载波自陡峭和冲击的发展。结果表明,在冲击 regime 的极限和(近)冲击脉冲波形中,正常色散和反常色散之间存在明显的不对称性。结合这些见解,我们就如何通过实验实现载波冲击(或至少是极端自陡峭)提出了一些建议。