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Spatial and temporal frequency domain laser-ultrasound applied in the direct measurement of dispersion relations of surface acoustic waves
15. The pixel pitch of the SLM is 8 μm, with 512 × 512 pixels dimensions of the tiled hologram. The focal length of the objective lens was 16 mm and the used excitation light wavelength 1550 nm.
16. Material properties for molybdenum (Mo) and silicon oxide (SiO) all assumed to be isotropic; density ρ and elastic constants E and G are as follows: for Mo , 23.3 GPa and 90.25 GPa; for SiO , 71.3 GPa and 30.63 GPa. The best fit for the thickness of the Mo layer was obtained as 3.5 μm.
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We present a laser-ultrasound measurement technique which combines adjustable spatial and temporal modulation of the excitation laser beam. Our method spreads the intensity of an amplitude modulated continuous wave laser over a micro-scale pattern on the sample surface to excite surface acoustic waves. The excitation pattern consists of parallel, equidistant lines and the waves generated from the individual lines interfere on the sample surface. Measurement is done in the spatial-temporal frequency domain allowing the direct determination of dispersion relations. The technique performs with high signal-to-noise-ratios and low peak power densities on the sample.
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