Method and apparatus for producing acoustic waves by laser pulse

Details Method and apparatus for producing acoustic waves by laser pulse Method and apparatus for producing acoustic waves by laser pulse

1977-12-01

1979-10-02

Sikes, William L.

G02F 111

Patent

active

041696620

ABSTRACT:
Focussed acoustic waves are generated free of physical contact in a light absorbing workpiece by the use of laser beam means providing a coherent light beam which in a pulsed manner impinges upon the surface of the workpiece in a Fresnel zone pattern. The zoned pattern is caused in a typical example by a suitable mask interposed between the laser source and workpiece surface. The thermal effect responsive to the laser beam energy produces in the workpiece a plurality of acoustic waves having a common focal point.

REFERENCES:
patent: 3710283 (1973-01-01), Alphonse

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