Abstract
In this paper, the mechanisms of laser ultrasound response formation in monocrystalline silicon are discussed. The ultrasound waves in the test specimen were generated with laser pulses of two different wavelengths and registered with a piezoelectric transducer. The amplitude of the measured signal was found to be a nonlinear function of the laser radiation intensity. It was shown, that the observed nonlinearity is related to the features of optical absorption and thermoelastic sources formation in the material. A simple model taking into account temperature dependencies of the thermal conductivity and thermal expansion coefficient was developed. An excellent agreement between experimental and simulation for different wavelengths was demonstrated.
Highlights
Laser ultrasound (LU) is a promising tool for the diagnostics and study of various media
Laser ultrasound methods are based on the photoacoustic (PA) effect – the excitation of ultrasonic waves in the sample by laser radiation
The solid line corresponds to the linear approximation of experimental points obtained for laser radiation with intensity less than 5 MW/cm[2]
Summary
Laser ultrasound (LU) is a promising tool for the diagnostics and study of various media. It has important advantages of being contactless, providing deep penetration, allowing for high spatial and temporal resolution, and enabling on-line and high sensitivity measurements.[1,2,3] recent trends of the LU imaging demonstrate essential advantages of this method for the biomedical application.[4] Laser ultrasound methods are based on the photoacoustic (PA) effect – the excitation of ultrasonic waves in the sample by laser radiation. LU can be applied for simultaneous study of optical, thermal and elastic properties of various materials.[5,6]
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