Broadband Optical Reflectance Measurements of Shock-Compressed Si and Ti
ORAL
Abstract
Optical reflectance spectra of shocked material states have historically been difficult to
obtain due to the mm spatial scales and ns timescales of shock-compression
experiments. Nonetheless, such spectra are useful for identifying phase transitions and
understanding electrical conductivity of materials. A new diagnostic and experimental
platform for the OMEGA EP laser facility enables optical reflectance spectrum of shocked
materials to be collected in the waveband 450-750 nm. This talk will present recent results
using this platform for shocked silicon and titanium. The silicon reflectance spectrum is
found to change shape on shocking, indicating a possible change in electronic structure.
The Ti reflectance spectrum is found to stay relatively constant as a function of pressure,
supporting its use as a reflection standard in many previous dynamic compression
experiments.
obtain due to the mm spatial scales and ns timescales of shock-compression
experiments. Nonetheless, such spectra are useful for identifying phase transitions and
understanding electrical conductivity of materials. A new diagnostic and experimental
platform for the OMEGA EP laser facility enables optical reflectance spectrum of shocked
materials to be collected in the waveband 450-750 nm. This talk will present recent results
using this platform for shocked silicon and titanium. The silicon reflectance spectrum is
found to change shape on shocking, indicating a possible change in electronic structure.
The Ti reflectance spectrum is found to stay relatively constant as a function of pressure,
supporting its use as a reflection standard in many previous dynamic compression
experiments.
–
Publication: Planned RSI paper about the reflectance platform for EP and the initial experiments
Presenters
-
Robert Nowak
Laboratory for Laser Energetics, University of Rochester
Authors
-
Robert Nowak
Laboratory for Laser Energetics, University of Rochester
-
Neel V Kabadi
Laboratory for Laser Energetics (LLE), Laboratory for Laser Energetics, University of Rochester, Rochester, NY, United States, Laboratory for Laser Energetics
-
Gilbert W Collins
University of Rochester, Department of Physics and Astronomy, University of Rochester, Rochester, NY, United States, Laboratory for Laser Energetics, University of Rochester
-
J. Ryan Rygg
Laboratory for Laser Energetics, University of Rochester