Method and apparatus for determining pressure-induced frequency-shifts in shock-compressed materials
- Los Alamos, NM
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.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- DOE Contract Number:
- W-7405-ENG-36
- Assignee:
- United States of America as represented by United States (Washington, DC)
- Patent Number(s):
- US 4555176
- OSTI ID:
- 865679
- Country of Publication:
- United States
- Language:
- English
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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
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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
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sample vessel
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