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In our experiment the excitation and probe pulses were both of 100 ps duration. Wavelengths were 1064 and 532 nm, respectively. The repetition rate was 3.8 kHz.
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15
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33748869614
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note
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The acoustic waves will in general encounter a heated material as they propagate through the thermal grating which persists for some time after they are launched. However, calculation based on the measured intensity of the laser pulses, the cobalt reflectivity and skin depth at the excitation wavelength, and the thermal diffusivity indicates that surface heating associated with the laser excitation has a negligible impact on measured surface velocities. We find that a layer of a material much thinner than the acoustic wavelength is heated by about 10°C during the experimental time interval of approximately 20 ns.
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44 obtained directly at 1 bar is smaller than the value extrapolated from the fit to the high pressure data that is listed in Table I by approximately 4%. This may imply some difference in the crystallinity of the near-surface region (i.e., within approximately 2 μm of the surface, corresponding to the penetration depth of the acoustic wave) of the two separate crystals.
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