Gaeta AL
School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853, USA.
Phys Rev Lett. 2000 Apr 17;84(16):3582-5. doi: 10.1103/PhysRevLett.84.3582.
We investigate theoretically the self-focusing dynamics of an ultrashort laser pulse both near and above the threshold at which the pulse effectively undergoes catastrophic collapse. We find that, as a result of space-time focusing and self-steepening, an "optical shock" wave forms inside the medium that gives rise to a broad blueshifted pedestal in the transmitted pulse spectrum. Our results are in good agreement with the primary features observed in experiments and thus provide a theoretical understanding for the underlying process that gives rise to "white-light" generation.
我们从理论上研究了超短激光脉冲在接近和高于阈值时的自聚焦动力学，在该阈值下脉冲会有效发生灾难性坍缩。我们发现，由于时空聚焦和自陡峭效应，介质内部会形成一个“光学激波”波，这会在透射脉冲光谱中产生一个宽的蓝移基座。我们的结果与实验中观察到的主要特征高度吻合，从而为产生“白光”的潜在过程提供了理论理解。
