Diagnosis of Ultrafast Laser-Heated Metal Surfaces and Plasma Expansion with Absolute Displacement Interferometry

Details Diagnosis of Ultrafast Laser-Heated Metal Surfaces and Plasma Expansion with Absolute Displacement Interferometry Diagnosis of Ultrafast Laser-Heated Metal Surfaces and Plasma Expansion with Absolute Displacement Interferometry

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aipc..706.1401r&link_type=abstract

SHOCK COMPRESSION OF CONDENSED MATTER - 2003: Proceedings of the Conference of the American Physical Society Topical Group on Sh

Physics

Condensed Matter

1

Ultraviolet, Visible, And Infrared Radiation Effects, Plasma Production And Heating By Laser Beams, High-Pressure And Shock Wave Effects In Solids And Liquids

Scientific paper

We report on the development of a novel technique to measure the critical surface displacement in intense, ultrashort, laser-solid target experiments. Determination of the critical surface position is important for understanding near solid density plasma dynamics and transport from warm dense matter systems, and for diagnosing short scale length plasma expansion and hydrodynamic surface motion from short pulse, laser-heated, solid targets. Instead of inferring critical surface motion from spectral power shifts using a time-delayed probe pulse or from phase shifts using ultrafast pump-probe frequency domain interferometry (FDI), this technique directly measures surface displacement using a single ultrafast laser heating pulse. Our technique is based on an application of a Michelson Stellar interferometer to microscopic rather than stellar scales, and we report plasma scale length motion as small as 10 nm. We will present results for motion of plasmas generated from several target materials (Au, Al, Au on CH plastic) for a laser pulse intensity range from 1011 to 1016 W/cm2. Varying both, the pulse duration and the pulse energy, explores the dependence of the expansion mechanism on the energy deposited and on the peak intensity. Comparisons with hydrocodes reveal the applicability of hydrodynamic models.

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