Pulsed-Laser Generation of Ultra-Short Acoustic Pulses: Application for Thin-Film Ultrasonic Measurements.
IBM RESEARCH LAB SAN JOSE CA
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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. Ultrasonic attenuation for the narrow acoustic pulses are very large and are also measured. Author
- Acoustic Detection and Detectors