Dynamics of phase transition under laser-induced shock compression

Abstract

Dynamics of materials under laser shock compression has been studied by using nanosecond time-resolved Raman spectroscopy. Laser shock is induced by focusing 10-ns pulse laser and Raman scattering is induced by 25-ps pulse laser. Liquid-solid phase transition of benzene under shock compression at 3.7 GPa has been observed within 20 ns by using time-resolved coherent anti-Stokes Raman scattering. Structural phase transition of polytetrafluoroethylene from spiral structure to planar zigzag structure has been observed at 1 GPa within 10 ns.