Experimental and theoretical study of acoustic waves generated by a laser line pulse in an optically absorptive isotropic cylinder

Ségur, Damien; Shuvalov, A. L.; Audoin, Bertrand; Pan, Yong

doi:10.1121/1.3263612

Cited by 6 publications

(2 citation statements)

References 18 publications

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“…Attention to the effects of thermal and optical parameters of solids on laser generation of sound continued to be paid also in more recent publications (see e.g. [14,15]). In the present paper, the behaviour of directivity patterns of laser-generated sound in solids is examined on the basis of the rigorous approach developed in [7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Directivity patterns of laser-generated sound in solids: Effects of optical and thermal parameters

Krylov

2016

Ultrasonics

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In the present paper, directivity patterns of laser-generated sound in solids are investigated theoretically. Two main approaches to the calculation of directivity patterns of lasergenerated sound are discussed for the most important case of thermo-optical regime of generation. The first approach, which is widely used in practice, is based on the simple modelling of the equivalent thermo-optical source as a mechanical dipole comprising two horizontal forces applied to the surface in opposite directions. The second approach is based on the rigorous theory that takes into account all acoustical, optical and thermal parameters of a solid material and all geometrical and physical parameters of a laser beam. Directivity patterns of laser-generated bulk longitudinal and shear elastic waves, as well as the amplitudes of generated Rayleigh surface waves, are calculated for different values of physical and geometrical parameters and compared with the directivity patterns calculated in case of dipole-source representation. It is demonstrated that the simple approach using a dipole-source representation of laser-generated sound is rather limited, especially for description of generated longitudinal acoustic waves. A practical criterion is established to define the conditions under which the dipole-source representation gives predictions with acceptable errors. It is shown that, for radiation in the normal direction to the surface, the amplitudes of longitudinal waves are especially sensitive to the values of thermal parameters and of the acoustic reflection coefficient from a free solid surface. A discussion is given on the possibility of using such a high sensitivity to the values of the reflection coefficient for investigation of surface properties of real solids.

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Section: Introductionmentioning

confidence: 99%

Directivity patterns of laser-generated sound in solids: Effects of optical and thermal parameters

Krylov

2016

Ultrasonics

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“…19 They observed the dependence of A 0 and S 0 Lamb mode amplitudes on the optical absorption coefficient. The effect of optical absorption on the generation of ultrasonic bulk waves in optically moderate-to low-absorbing materials was also intensively studied for the last decades [20][21][22][23][24] but always considering the laser beam to be normal to the surface of the sample. Recently the generation of ultrasonic bulk waves in moderately absorbing glass samples was investigated.…”

Section: Introductionmentioning

confidence: 99%

Effect of refracted light distribution on the photoelastic generation of zero-group velocity Lamb modes in optically low-absorbing plates

Raetz

Laurent

Dehoux

et al. 2015

The Journal of the Acoustical Society of America

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Zero-group velocity (ZGV) Lamb modes are associated with sharp local acoustic resonances and allow, among other features, local measurement of Poisson's ratio. While the thermoelastic generation of Lamb waves in metal plates has been widely studied, the case of materials of low-optical absorption remains unexplored. In materials such as glasses, the generation of bulk elastic waves has been demonstrated to be sensitive to the refracted light distribution. In this paper, a detailed analysis of the effect of light refraction on the laser-based generation of ZGV Lamb modes is presented. Experiments are performed on a bare glass plate without the need for an additional layer for light absorption or reflection. Using an appropriate tilted volume source, it is shown that the laser-ultrasonic technique allows non-contact measurement of the Poisson's ratio.

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UV laser-induced transport properties change in silver metaphosphate glass

Khalil

Salman

Yamani

2010

Optics Communications

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Experimental and theoretical study of acoustic waves generated by a laser line pulse in an optically absorptive isotropic cylinder

Cited by 6 publications

References 18 publications

Directivity patterns of laser-generated sound in solids: Effects of optical and thermal parameters

Directivity patterns of laser-generated sound in solids: Effects of optical and thermal parameters

Effect of refracted light distribution on the photoelastic generation of zero-group velocity Lamb modes in optically low-absorbing plates

UV laser-induced transport properties change in silver metaphosphate glass

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