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

被引:26
|
作者
Kumar, V. Rakesh [1 ]
Kiran, P. Prem [1 ]
机构
[1] Univ Hyderabad, ACRHEM, Hyderabad 500046, Andhra Pradesh, India
关键词
LASER-INDUCED BREAKDOWN; OPTICAL-BREAKDOWN; HYDROGEN-BONDS; INDUCED PLASMA; HEAVY-WATER; EARLY-STAGE; NANOSECOND; GENERATION; PICOSECOND; DYNAMICS;
D O I
10.1364/OL.40.002802
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
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. (C) 2015 Optical Society of America
引用
收藏
页码:2802 / 2805
页数:4
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