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Title: Method and apparatus for determining pressure-induced frequency-shifts in shock-compressed materials

Abstract

A method and an apparatus for conducting coherent anti-Stokes Raman scattering spectroscopy in shock-compressed materials are disclosed. The apparatus includes a sample vessel having an optically transparent wall and an opposing optically reflective wall. Two coherent laser beams, a pump beam and a broadband Stokes beam, are directed through the window and focused on a portion of the sample. In the preferred embodiment, a projectile is fired from a high-pressure gas gun to impact the outside of the reflective wall, generating a planar shock wave which travels through the sample toward the window. The pump and Stokes beams result in the emission from the shock-compressed sample of a coherent anti-Stokes beam, which is emitted toward the approaching reflective wall of the vessel and reflected back through the window. The anti-Stokes beam is folded into a spectrometer for frequency analysis. The results of such analysis are useful for determining chemical and physical phenomena which occur during the shock-compression of the sample.

Inventors:
 [1];  [1]
  1. (Los Alamos, NM)
Issue Date:
Research Org.:
Los Alamos National Laboratory (LANL), Los Alamos, NM
OSTI Identifier:
865679
Patent Number(s):
4555176
Assignee:
United States of America as represented by United States (Washington, DC) LANL
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; apparatus; determining; pressure-induced; frequency-shifts; shock-compressed; materials; conducting; coherent; anti-stokes; raman; scattering; spectroscopy; disclosed; sample; vessel; optically; transparent; wall; opposing; reflective; laser; beams; pump; beam; broadband; stokes; directed; window; focused; portion; preferred; embodiment; projectile; fired; high-pressure; gas; gun; impact; outside; generating; planar; shock; wave; travels; result; emission; emitted; approaching; reflected; folded; spectrometer; frequency; analysis; results; useful; chemical; physical; phenomena; occur; shock-compression; coherent laser; gas gun; high-pressure gas; optically transparent; transparent wall; laser beams; raman scattering; shock wave; pressure gas; laser beam; preferred embodiment; pump beam; reflective wall; shock-compressed materials; coherent anti-stokes; beams result; sample vessel; anti-stokes raman; /356/

Citation Formats

Moore, David S., and Schmidt, Stephen C. Method and apparatus for determining pressure-induced frequency-shifts in shock-compressed materials. United States: N. p., 1985. Web.
Moore, David S., & Schmidt, Stephen C. Method and apparatus for determining pressure-induced frequency-shifts in shock-compressed materials. United States.
Moore, David S., and Schmidt, Stephen C. Tue . "Method and apparatus for determining pressure-induced frequency-shifts in shock-compressed materials". United States. https://www.osti.gov/servlets/purl/865679.
@article{osti_865679,
title = {Method and apparatus for determining pressure-induced frequency-shifts in shock-compressed materials},
author = {Moore, David S. and Schmidt, Stephen C.},
abstractNote = {A method and an apparatus for conducting coherent anti-Stokes Raman scattering spectroscopy in shock-compressed materials are disclosed. The apparatus includes a sample vessel having an optically transparent wall and an opposing optically reflective wall. Two coherent laser beams, a pump beam and a broadband Stokes beam, are directed through the window and focused on a portion of the sample. In the preferred embodiment, a projectile is fired from a high-pressure gas gun to impact the outside of the reflective wall, generating a planar shock wave which travels through the sample toward the window. The pump and Stokes beams result in the emission from the shock-compressed sample of a coherent anti-Stokes beam, which is emitted toward the approaching reflective wall of the vessel and reflected back through the window. The anti-Stokes beam is folded into a spectrometer for frequency analysis. The results of such analysis are useful for determining chemical and physical phenomena which occur during the shock-compression of the sample.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1985},
month = {1}
}

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