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3
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33645497016
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The theory of the generation of elastic waves by surface heating has been considered by R. M. White [, ], but with emphasis on heating by a harmonically modulated source.
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(1963)
J. Appl. Phys.
, vol.34
, pp. 3559
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5
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84926579842
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There is a very extensive literature covering the generation of stress pulses by much longer light pulses, e.g., 1-nsec duration or longer. In materials with large absorption v τ0 is usually much greater than zeta for such pulses. Thus, the value of zeta becomes irrelevant and one can imagine the energy to be absorbed at the surface of the solid. The shape of the generated stress pulse is then determined by the pulse length τ0 and the rate of diffusion of heat. For a recent review, see W. Arnold, Acta Phys. Slovaca (to be published).
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19
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0001822828
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The calculation used the density of sapphire (4.0 g^cm sup -3_) and the sound velocity of 11 times 105 ~ cm ^ sec-1 as calculated by G. W. Farnell [Can. J. Phys. 39, 65 (1961), see the Appendix]. The density of a- As2 Te3 is 5.54 g^cm sup -3, and we have used our own measurements for the sound velocity.
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(1973)
J. Non-Cryst. Solids
, vol.12
, pp. 85
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Cornet, J.1
Rossier, D.2
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22
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84926578083
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This is just the time-dependent part of the strain due to the propagating acoustic pulse. The static strain due to thermal expansion is not included [see Eq. (7)].
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25
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84926537269
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This is based on the Dulong-Petit law.
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29
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84926536690
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This effect has also been observed in transparent materials. C. Thomsen, H. T. Grahn, H. J. Maris, and J. Tauc, Opt. Commun. (to be published).
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32
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84926564134
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The relevant quantity is the acoustic attenuation at a frequency corresponding to the period 44.8 psec, i.e, 22.3 GHz. The distance over which the amplitude of an acoustic wave of this frequency decays in a typical glass is approximately 104_ Å (see, for example, the results we give in this paper for As2 _Te3 _).
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35
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84926566311
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We have not investigated the grain size or crystallographic orientation of our metal films.
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39
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84926605255
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In this analysis we have for simplicity ignored the possibility of acoustic dispersion.
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