Laser generation of ultrasound in films and coatings
- 7 June 1999
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 74 (23) , 3561-3563
- https://doi.org/10.1063/1.124161
Abstract
A model for the pulsed laser generation of ultrasound in an isotropic film on a semi-infinite substrate is presented. The model gives the time domain displacement of the system as a function of the density and mechanical properties of the film and substrate and the thermal properties of the film. The model has been verified experimentally using a 1 ns Nd:YAG laser source for acoustic wave generation and a stabilized Michelson interferometer for detection. Experimental and theoretical signals agree well for both the case of a fast layer on a slow substrate (zirconium nitride/steel) and a slow layer on a fast substrate (titanium/aluminum).Keywords
This publication has 13 references indexed in Scilit:
- Investigation of diffuse interfaces using time-resolved acoustic spectroscopyJournal of Applied Physics, 1999
- High-precision film thickness determination using a laser-based ultrasonic techniqueApplied Physics Letters, 1998
- Property Evaluation of Vapor-Deposited TiN Film by the Analysis of Elastic Waves. (1st Report, Nondestructive Evaluation of Elastic Properties by Laser Surface Acoustic Waves.)JSME International Journal Series A, 1998
- Real-time detection of laser-induced transient gratings and surface acoustic wave pulses with a Michelson interferometerJournal of Applied Physics, 1997
- Controlling the quality of thin films by surface acoustic wavesUltrasonics, 1997
- Real-time optical characterization of surface acoustic modes of polyimide thin-film coatingsJournal of Applied Physics, 1992
- Determination of elastic modulus and thickness of surface layers by ultrasonic surface wavesThin Solid Films, 1992
- Quantitative theory for laser ultrasonic waves in a thin plateApplied Physics Letters, 1990
- On the precursor in laser-generated ultrasound waveforms in metalsApplied Physics Letters, 1990
- Surface generation and detection of phonons by picosecond light pulsesPhysical Review B, 1986