Pulsed-laser generation of ultra-short acoustic pulses: Application for thin-film ultrasonic measurements
Abstract
We demonstrate opto-acoustic generation and detection of acoustic pulses of 1 nanosecond duration in condensed matter. Such opto-acoustic pulses are at least one order of magnitude shorter than those previously reported. These narrow acoustic pulses find new application for thin-film pulse measurement which are not possible with conventional transducer techniques. Round trip echo times are measured to 1% accuracy for stainless steel films of 12 micron thickness. This provides a new high accuracy thickness measurement in a pulsed mode. Untrasonic attenuation for the narrow acoustic pulses are very large and are also measured.
- Publication:
-
Unknown
- Pub Date:
- May 1984
- Bibcode:
- 1984plgu.rept.....T
- Keywords:
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- Acoustic Attenuation;
- Acoustic Velocity;
- Acousto-Optics;
- Nitrogen Lasers;
- Pulsed Lasers;
- Thin Films;
- Ultrasonics;
- Polymers;
- Pulse Duration;
- Signal Detectors;
- Sound Generators;
- Stainless Steels;
- Thickness;
- Transducers;
- Acoustics