Frequency shift measurement in shock-compressed materials

Patent · Tue Jan 01 00:00:00 EST 1985

OSTI ID:865621

Moore, David S ^[1]; Schmidt, Stephen C ^[1]

---

1. Los Alamos, NM

A method for determining molecular vibrational frequencies in shock-compressed transparent materials. A single laser beam pulse is directed into a sample material while the material is shock-compressed from a direction opposite that of the incident laser beam. A Stokes beam produced by stimulated Raman scattering is emitted back along the path of the incident laser beam, that is, in the opposite direction to that of the incident laser beam. The Stokes beam is separated from the incident beam and its frequency measured. The difference in frequency between the Stokes beam and the incident beam is representative of the characteristic frequency of the Raman active mode of the sample. Both the incident beam and the Stokes beam pass perpendicularly through the shock front advancing through the sample, thereby minimizing adverse effects of refraction.

• 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 4545679
• OSTI ID: 865621
• Country of Publication: United States
• Language: English

Related Subjects

frequency
shift
measurement
shock-compressed
materials
method
determining
molecular
vibrational
frequencies
transparent
single
laser
beam
pulse
directed
sample
material
direction
opposite
incident
stokes
produced
stimulated
raman
scattering
emitted
path
separated
measured
difference
representative
characteristic
active
mode
pass
perpendicularly
shock
front
advancing
minimizing
adverse
effects
refraction
stimulated raman
adverse effects
active mode
frequency shift
opposite direction
incident laser
raman scattering
laser beam
beam pulse
incident beam
direction opposite
sample material
single laser
shock front
shock-compressed materials
transparent material
beam produced
raman active
transparent materials
shift measurement
parent material
determining molecular
/356/