Abstract
A simplified analysis of surface wave generation by laser irradiation of a homogeneous, isotropic, linearly elastic body is presented. The thermoelastic process of expansion of a surface element is examined, and a direct derivation of equivalent mechanical surface loading is presented. A novel representation of surface wave motion is given in terms of a single-wave potential for a carrier wave propagating on the free surface. Finally, for time-harmonic laser irradiation the elastodynamic reciprocity theorem is used to relate the generated surface wave motion to a virtual surface wave, which leads to a straightforward analytical determination of the generated surface waves for the cases of laser line- and point-focused illumination. The surface-wave pulses for pulsed irradiation are obtained by Fourier superposition. For the line-focus case the surface-wave pulse is proportional to the laser pulse, while for point-focus illumination the surface-wave pulse consists of a principal pulse followed by a smaller pulse of opposite sign.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 1885-1902 |
| Number of pages | 18 |
| Journal | Journal of the Mechanics and Physics of Solids |
| Volume | 51 |
| Issue number | 11-12 |
| DOIs | |
| State | Published - Nov 2003 |
| Externally published | Yes |
| Event | Proceedings of a Symposium on Dynamic Failure and Thin Film - Pasadena, United States Duration: Jan 16 2003 → Jan 16 2003 |
Keywords
- Elastic
- Laser excitation
- Surface wave
- Ultrasonics
ASJC Scopus subject areas
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering