All-optical generation of surface acoustic waves in a silica optical microwire

2014 ◽  
Author(s):  
Jean-Charles Beugnot ◽  
Sylvie Lebrun ◽  
Gilles Pauliat ◽  
Herv Maillotte ◽  
Vincent Laude ◽  
...  
Keyword(s):  
Acoustic Waves ◽  
Surface Acoustic Waves ◽  
Optical Generation ◽  
All Optical

Laser-Based Ultrasound Interrogation of Surface and Sub-Surface Features in Advanced Manufacturing Materials

2021 ◽  
Author(s):  
Kathryn Jinae Harke ◽  
Nicholas Calta ◽  
Joseph Tringe ◽  
David Stobbe
Keyword(s):  
Acoustic Waves ◽  
Surface Defects ◽  
Surface Acoustic Waves ◽  
Acoustic Energy ◽  
Advanced Manufacturing ◽  
Powder Bed ◽  
Surface Features ◽  
Performance Targets ◽  
All Optical ◽  
X Ray Computed

Abstract Structures formed by advanced manufacturing methods increasingly require nondestructive characterization to enable efficient fabrication and to ensure performance targets are met. This is especially important for aerospace, military, and high precision applications. Surface acoustic waves (SAW) generated by laser-based ultrasound can detect surface and sub-surface defects relevant for a broad range of AM processes, including laser powder bed fusion (LPBF). In particular, an all-optical SAW generation and detection configuration can effectively interrogate laser melt lines. Here we report on scattered acoustic energy from melt lines, voids, and surface features. Sub-surface voids are also characterized using X-ray Computed Tomography (CT). High resolution CT results are presented and compared with SAW measurements. Finite difference simulations inform experimental measurements and analysis.

Noncontacting optical generation of focused surface acoustic waves using a customised zoneplate

1995 ◽  
Vol 31 (4) ◽  
pp. 264-265 ◽  
Author(s):  
M. Liu ◽  
J.M.R. Weaver ◽  
H.P. Ho ◽  
M.G. Somekh
Keyword(s):  
Acoustic Waves ◽  
Surface Acoustic Waves ◽  
Optical Generation

scholarly journals Optical generation of surface acoustic waves guided at the linear boundary between two thin films

2010 ◽  
Vol 107 (3) ◽  
pp. 033521 ◽  
Author(s):  
A. A. Maznev ◽  
Timothy A. Kelf ◽  
Motonobu Tomoda ◽  
Osamu Matsuda ◽  
Oliver B. Wright
Keyword(s):  
Thin Films ◽  
Acoustic Waves ◽  
Surface Acoustic Waves ◽  
Linear Boundary ◽  
Optical Generation

Precise Determination of Thin Metal Film Thickness With Laser-Induced Acoustic Grating Technique

1999 ◽  
Vol 591 ◽  
Author(s):  
A.A. Maznev ◽  
M.J. Banet ◽  
M. Gostein ◽  
R.B. Hanselman ◽  
M.A. Joffe ◽  
...  
Keyword(s):  
Film Thickness ◽  
Integrated Circuit ◽  
Acoustic Waves ◽  
Metal Film ◽  
Surface Acoustic Waves ◽  
Precise Determination ◽  
Thin Metal Film ◽  
All Optical ◽  
Nondestructive Measurements

ABSTRACTAn all-optical technique based on laser excitation and detection of surface acoustic waves is capable of precise, fast, noncontact and nondestructive measurements of metal film thickness. The technique is integrated into a compact and robust instrument. Applications to metal interconnect process control in integrated circuit technology are presented.

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