液态水冰VII相的形成：受激拉曼散射中丝状化的作用。

Onset of ice VII phase of liquid water: role of filamentation in stimulated Raman scattering.

作者信息

Rakesh Kumar V, Prem Kiran P

出版信息

Opt Lett. 2015 Jun 15;40(12):2802-5. doi: 10.1364/OL.40.002802.

DOI:10.1364/OL.40.002802

Abstract

Energy dependent evolution of Stokes and anti-Stokes lines of ice VII via forward stimulated Raman scattering (FSRS) during propagation of a 30 ps laser pulse through liquid water, confirming structural change over GPa pressure range, is studied. Self-focusing of the intense laser pulses is observed to ionize the medium generating free electrons that dominate the evolution of SRS signals. The confinement of plasma-generated free electrons by filamentation is observed to enhance the signature Raman modes of ice VII by reducing the SRS threshold.

摘要

研究了在30皮秒激光脉冲通过液态水传播期间，通过前向受激拉曼散射（FSRS）实现的冰VII的斯托克斯线和反斯托克斯线的能量依赖演化，证实了在吉帕压力范围内的结构变化。观察到强激光脉冲的自聚焦使介质电离产生自由电子，这些自由电子主导了SRS信号的演化。观察到通过丝状化对等离子体产生的自由电子的限制，通过降低SRS阈值来增强冰VII的特征拉曼模式。