Ultrafast vibrational spectroscopy imaging of nanoshock planar propagation

Y. Yang, S. A. Hambir, Dana D Dlott

Research output: Contribution to journalArticlepeer-review

Abstract

Variations of the velocity and pressure of repetitive 4 GPa laser-driven shock fronts in a polymer thin film are studied using spatially resolved ultrafast coherent anti-Stokes Raman Spectroscopy (CARS) measurements of shock compression of an anthracene optical gauge. Even though the radial profile of the laser pulse that generates the shock is a Gaussian that falls off steeply at the edges, optical saturation effects in the shock generation layer flatten out the shock front. Detailed measurements show the shock pressure, as indicated by the blueshift of an anthracene vibrational transition, and the shock velocity, as indicated by the arrival time at the anthracene gauge layer, remain constant within better than 5% over the central region probed by CARS, over a run distance of at least 11 μm.

Original languageEnglish (US)
Pages (from-to)129-136
Number of pages8
JournalShock Waves
Volume12
Issue number2
DOIs
StatePublished - Aug 1 2002

Keywords

  • Laser-driven shock waves
  • Planar shock
  • Vibrational spectroscopy

ASJC Scopus subject areas

  • Computational Mechanics
  • Mechanics of Materials

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