title: Onset of ice VII phase of liquid water: role of filamentation in stimulated Raman scattering.
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.
authors.forename: V
authors.initials: V
authors.lastname: Rakesh Kumar
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authors.initials: P
authors.lastname: Prem Kiran