AEM/STEM analysis of vapor-deposited multilayered laser targets Page: 2 of 16
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AEM/STEM ANALYSIS OF VAPOR DEPOSITFD MULTILAYER LASER TARGETS
K. A. Johnson, K- P. Staudhammer, G. A. Reeves, L. R. Vesser
Los Alamos National Laboratory
Los Alamos, NM 87545
Large pulsed lasers have been used for shock studies, particularly for
equation of .trate measurements for several years. 1213, One experimental
problem has been accurate measurement of absolute density of the target
foils. 'The foils, examined here, were made and measured for that
purpose. The layout of the targets and supporting substrate is
schematically shown in Figure 1.
S(TEM) e':arinations were made to augment the other type: of
measurements of absolute density. We examined the structure of the 5 pm
thick layers of aluminum and gold on aluminum laminate gold substrate to
establish film integrity, :o characterize the microscructure, as well as to
estimate the surface roughness of this multilayer material. The TEM samples
proved to be somewhat difficult LO prepare due to the imiltilayers within the
material, particularly the amorphous non-conducting aluminum oxide
(Al 0 ).
x y
It is important to know the uniformity of the target layers as well as
the roughnesses of the surface. The aluminum in the substrate was made
homogeneous by introducing a small anwunt of oxygen (in pulerns') to breal' up
the growth of grain structure during the evaporation process . W' did not
add oxygen to the targc't layers since the requirements dictate a pure metal.
Tile target layers requi red a homogenous, uniform r-tructure asM close to
theoretical density as possible. For th hardened subatrute aluminum, there
was additional Ii tt rent in the uniformity and structure because tais
material is; finding a wide variet y of app l icati(ns in physics experiment
which require very thin, so lf-suppo t112ing i aluminum foilH.{:'
r
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Johnson, K. A.; Staudhammer, K. P.; Reeves, G. A. & Vesser, L. R. AEM/STEM analysis of vapor-deposited multilayered laser targets, article, January 1, 1983; New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc1113571/m1/2/: accessed April 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.