Laser picosecond acoustics in a two-layer structure with oblique probe light incidence.
A theory for the analysis of experiments involving laser picosecond acoustics with obliquely incident probe light in a two-layer structure is outlined. The reflectance and phase changes of the reflected light are calculated with a theory that takes into account the effects of multiple optical reflections. The sample consists of a single partially transparent layer on a substrate, both with arbitrary optical constants. We discuss the conditions in which one may discriminate between components of the optical modulation of a probe beam arising from the photoelastic effect and from the displacement of the sample interfaces induced by the acoustic strain.
Matsuda
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Department of Applied Physics, Faculty of Engineering, Hokkaido University, Sapporo 060-8628, Japan. omatsuda@eng.hokudai.ac.jp
Wright
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