Gouy phase shift of single-cycle picosecond acoustic pulses
Abstract
Ultrafast laser pulses are used to generate single-cycle picosecond acoustic pulses in thin metal films on silicon. For small initial excitation spot sizes, propagation of the acoustic pulses across a 485-μm Si crystal leads to significant diffraction effects. The temporal reshaping of the acoustic wave form due to diffraction is investigated, and we demonstrate that the acoustic far field can be reached.
- Publication:
-
Applied Physics Letters
- Pub Date:
- July 2003
- DOI:
- 10.1063/1.1590405
- Bibcode:
- 2003ApPhL..83..392H
- Keywords:
-
- 62.65.+k;
- 43.20.El;
- Acoustical properties of solids;
- Reflection refraction diffraction of acoustic waves