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Laser-generated ultrasonic pulse shapes at solid wedges

  • Laser pulses focused near the tip of an elastic wedge generate acoustic waves guided at its apex. The shapes of the acoustic wedge wave pulses depend on the energy and the profile of the exciting laser pulse and on the anisotropy of the elastic medium the wedge is made of. Expressions for the acoustic pulse shapes have been derived in terms of the modal displacement fields of wedge waves for laserLaser pulses focused near the tip of an elastic wedge generate acoustic waves guided at its apex. The shapes of the acoustic wedge wave pulses depend on the energy and the profile of the exciting laser pulse and on the anisotropy of the elastic medium the wedge is made of. Expressions for the acoustic pulse shapes have been derived in terms of the modal displacement fields of wedge waves for laser excitation in the thermo-elastic regime and for excitation via a pressure pulse exerted on the surface. The physical quantity considered is the local inclination of a surface of the wedge, which is measured optically by laser-probe-beam deflection. Experimental results on pulse shapes in the thermo-elastic regime are presented and confirmed by numerical calculations. They pertain to an isotropic sharp-angle wedge with two wedge-wave branches and to a non-reciprocity phenomenon at rectangular silicon edges.show moreshow less

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Metadaten
Author:Andreas Mayer, Pavel Dmitrievich Pupyrev, Alexey M. Lomonosov
Year of Publication:2016
Date of first Publication:2016/04/19
Language:English
GND Keyword:Lasertechnologie; Ultraschall
Parent Title (English):Ultrasonics
Volume:70
First Page:75
Last Page:83
Document Type:Article (reviewed)
Institutes:Hochschule Offenburg / Bibliografie
Acces Right:Frei zugänglich
Release Date:2018/01/30
Licence (German):License LogoEs gilt das UrhG
DOI:https://doi.org/10.1016/j.ultras.2016.04.014