Laser‐induced surface acoustic waves and photothermal surface gratings generated by crossing two pulsed laser beams

1990 ◽  
Vol 57 (2) ◽  
pp. 132-134 ◽  
Author(s):  
Akira Harata ◽  
Hiroyuki Nishimura ◽  
Tsuguo Sawada
Keyword(s):  
Acoustic Waves ◽  
Surface Acoustic Waves ◽  
Pulsed Laser ◽  
Laser Beams

Pulsed laser-stimulated surface acoustic waves in p-CdTe crystals

2001 ◽  
Vol 35 (8) ◽  
pp. 924-926 ◽  
Author(s):  
A. Baidullaeva ◽  
A. I. Vlasenko ◽  
É. I. Kuznetsov ◽  
A. V. Lomovtsev ◽  
P. E. Mozol’ ◽  
...  
Keyword(s):  
Acoustic Waves ◽  
Surface Acoustic Waves ◽  
Pulsed Laser

The converging-surface-acoustic-wave technique: anaylsis and applications to nondestructive evaluation

1986 ◽  
Vol 64 (9) ◽  
pp. 1324-1329 ◽  
Author(s):  
P. Cielo ◽  
C. K. Jen ◽  
X. Maldague
Keyword(s):  
Acoustic Waves ◽  
Laser Interferometer ◽  
Surface Acoustic Waves ◽  
Pulsed Laser ◽  
Ultrasonic Pulse ◽  
Planar Defects ◽  
Wave Technique ◽  
Pulse Arrival ◽  
Pulsed Laser Beam

Converging surface-acoustic waves (SAW) are generated by irradiating the inspected material with an annular-shaped pulsed laser beam. The converging-SAW pulse arrival is detected by a laser interferometer focused on the center of the annulus, where the converging effect produces a strong amplification of the ultrasonic pulse. This technique can be applied either to the detection of defects or to the characterization of the material by measuring the SAW velocity or attenuation. In this paper we present an analysis of the converging-wave propagation in order to explain some features of the detected signal, such as its shape and amplitude for different positions of the probing beam. A comparison with the signal intensities expected for a diverging as well as a collimated SAW is also presented. Applications of this technique to the characterization of anisotropic materials as well as to the detection of subsurface planar defects are presented and discussed.

An integrated method for material properties characterization based on pulsed laser generated surface acoustic waves

2013 ◽  
Vol 112 ◽  
pp. 249-254 ◽  
Author(s):  
Yannis Orphanos ◽  
Vasilis Dimitriou ◽  
Evaggelos Kaselouris ◽  
Efthimios Bakarezos ◽  
Nikolaos Vainos ◽  
...  
Keyword(s):  
Material Properties ◽  
Acoustic Waves ◽  
Surface Acoustic Waves ◽  
Pulsed Laser ◽  
Integrated Method ◽  
Properties Characterization

Measurements of Elastic Modulus Using Laser-Induced Surface Waves

1994 ◽  
Vol 356 ◽  
Author(s):  
D. J. Chang ◽  
S. T. Amimoto ◽  
R. W. Gross ◽  
T. S. Glenn
Keyword(s):  
Elastic Modulus ◽  
Surface Waves ◽  
Acoustic Waves ◽  
Detection Method ◽  
Surface Acoustic Waves ◽  
Pulsed Laser ◽  
Fused Silica ◽  
Knife Edge ◽  
Generate Surface ◽  
Edge Detection Method

AbstractMeasurements of the elastic modulus of fused silica, 6061-T6 and 7075-T651 aluminum alloys, GaAs, Ge, and Si samples are reported. A pulsed laser is used to generate surface acoustic waves in a sample and the wave velocity is measured using a knife-edge detection method. From the velocity of the surface waves the elastic modulus can be calculated.[1] Extension of this work to thin films is discusssed.

Characterization of RF Sputtered ZnO Piezoelectric Films Using Transmission Electron Microscope

1975 ◽  
Vol 33 ◽  
pp. 86-87
Author(s):  
Kemining W. Yeh ◽  
Richard S. Muller ◽  
Wei-Kuo Wu ◽  
Jack Washburn
Keyword(s):  
Integrated Circuit ◽  
Acoustic Waves ◽  
New Technology ◽  
Surface Acoustic Waves ◽  
Electromechanical Properties ◽  
Leading Role ◽  
Saw Devices ◽  
Transmission Electron ◽  
High Degree

Considerable and continuing interest has been shown in the thin film transducer fabrication for surface acoustic waves (SAW) in the past few years. Due to the high degree of miniaturization, compatibility with silicon integrated circuit technology, simplicity and ease of design, this new technology has played an important role in the design of new devices for communications and signal processing. Among the commonly used piezoelectric thin films, ZnO generally yields superior electromechanical properties and is expected to play a leading role in the development of SAW devices.

Attenuation of surface acoustic waves by quantum dots

1998 ◽  
Vol 77 (5) ◽  
pp. 1195-1202
Author(s):  
Andreas Knabchen Yehoshua, B. Levinson, Ora
Keyword(s):  
Quantum Dots ◽  
Acoustic Waves ◽  
Surface Acoustic Waves
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