Efficient laser generation of surface acoustic waves
AssigneeCanadian Patents and Development Limited
InventorsPaolo G. Cielo, Jean Bussiere
Life of this patent
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Abstract
The surface acoustic waves are generated by laser beam that is focussed onto a surface to irradiate it in an arcuate pattern as a partial annulus or as a still or moving fringe pattern. The arcuate pattern may be formed by a transmitting or a reflecting axicon, while the fringe pattern may be formed by splitting the laser beam into two beams and directing the two beams to the surface. In addition, a lens or a frequency shifting device may be placed in the path of one of the split beams to form a circular fringe or a moving fringe, respectively.
Claims12
A method of generating surface acoustic waves on a surface comprising:
- providing a laser generated optical beam;
- directing the beam to the surface;
- and focusing the beam into an annulus irradiated pattern on the surface to form a converging surface wave.
Apparatus for generating acoustic surface waves on a surface comprising:
- laser means for generating a coherent beam of optical energy;
- and
- means for focusing the beam onto the surface in an annulus irradiated pattern to form a converging surface wave.
A method of generating acoustic waves on a surface comprising:
- providing a laser generated optical beam;
- splitting the beam into two beams;
- directing the beams to the surface;
- and
- focusing the beams to form a fringe pattern on the surface to form a converging surface wave.
Apparatus for generating acoustic surface waves on a surface comprising:
- laser means for generating a coherent beam of optical energy;
- beam splitter means for splitting the beam into two beams;
- and
- reflector means for deflecting the two beams onto the surface to form a fringe pattern on the surface to form a converging surface wave.
Dependencies are inferred from the claim text.