Abstract
When a thin metal film is irradiated by an ultrafast laser, the energy of the laser is first absorbed by electrons and then transferred to the lattice. In addition, a thermoelastic wave is generated due to the thermoelastic coupling effect. An ultrafast thermoelasticity model utilizing the parabolic two-step heat conduction model and the generalized thermoelastic theory was formulated to describe the thermoelastic behavior of a thin metal film irradiated by a femtosecond laser pulse. The temporal profile of the ultrafast laser was regarded as being non-Gaussian. An analyticalnumerical technique based on the Laplace transform was used to solve the governing equations and the time histories of the electron temperature, lattice temperature, displacement and stress in a gold film were analyzed. The influence of the thickness of the film was also analyzed. In addition, the propagation of the stress wave through the film was analyzed.
| Original language | English |
|---|---|
| Pages (from-to) | 1202-1207 |
| Number of pages | 6 |
| Journal | International Journal of Mechanical Sciences |
| Volume | 52 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - 2010 Sept |
| Externally published | Yes |
Keywords
- Femtosecond laser
- Metal film
- Stress wave
- Thermoelastic coupling
- Two-step heat conduction
ASJC Scopus subject areas
- Civil and Structural Engineering
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering