Laser-Generated Ultrasonic Beams.
Abstract
A device has been developed which uses a Q-switched laser pulse to produce a plane compressive stress pulse or a slowly decaying sinusoidal stress wave train in any solid or liquid material. The device uses a thin liquid layer to totally absorb the laser pulse and generate a stress pulse by rapid thermal expansion. Compressive stress pulses of 200 nanosecond duration and up to 5 kilobar amplitude have been obtained. Wave trains of about 30 cycle duration and 1/4 kilobar amplitude (peak-to-peak in typical solids) have been obtained at frequencies between 1-25 MHz. Stress amplitudes may be varied by filtering the incident laser radiation. The laser radiation does not damage this transducer, so it may be used indefinitely. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1974
- Accession Number
- AD0782017
Entities
People
- M. P. Felix
Organizations
- University of California, San Diego