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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
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页码:2802 / 2805
页数:4
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