Measurement of shock wave rise times in metal thin films.
We have measured the rise time of laser-generated shock waves in vapor plated metal thin films using frequency-domain interferometry with subpicosecond time resolution. 10%- 90% rise times of <6.25 ps were found in targets ranging from 0.25 to 2.0 microm in thickness. Particle and average shock velocities were simultaneously determined. Shock velocities of approximately 5 nm/ps were inferred from the measured free surface velocity, corresponding to pressures of 30-50 kbar. Thus, the shock front extends only a few tens of lattice spacings.
Gahagan
K T
KT
Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
Moore
D S
DS
Funk
D J
DJ
Rabie
R L
RL
Buelow
S J
SJ
Nicholson
J W
JW