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A schematic diagram of the experimental setup is shown. The pump laser beam reflects from dichroic mirror (DM) and is focused by the microscope objective lens. The Michelson interferometer includes the sample surface, reference mirror M2, and beam splitter BS2. Failure is observed by the CCD camera.
Detector signal (bottom line) and normal free surface velocity (line with symbols) for the Cu film on glass substrate. Film thickness is .
Calculated free surface velocities (solid thick line), normal stress (triangles), and shear stress (circles) for the copper film on the glass substrate based on experimental measurements. Dashed line shows the normal stress calculated from Eq. (5). The film thickness is (a) and (b) .
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