Pulsed laser generation of ultrasound in a metal plate between the melting and ablation thresholds

2015 ◽  
Author(s):  
A. G. Every ◽  
Z. N. Utegulov ◽  
I. A. Veres
Keyword(s):  
Pulsed Laser ◽  
Metal Plate ◽  
Laser Generation

Ultrasonic Signals Generated by a Laser Source in Film/Substrate Systems

1999 ◽  
Author(s):  
T. W. Murray ◽  
Z. Guo ◽  
S. Krishnaswamy ◽  
J. D. Achenbach
Keyword(s):  
Mechanical Properties ◽  
Time Domain ◽  
Michelson Interferometer ◽  
Pulsed Laser ◽  
Laser Source ◽  
Laser Generation ◽  
Ultrasonic Signals ◽  
Acoustic Wave Generation ◽  
The Time Domain ◽  
Film Substrate

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. Theoretical signals are calculated and analyzed for both a slow layer on a fast substrate and a fast layer on a slow substrate. 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 fast on slow and slow on fast systems.

255mJ All-Fiber Pulsed Laser Generation and solutionof Parasitic Oscillation

2021 ◽  
Author(s):  
shijie wang ◽  
Xianfeng Lin ◽  
Zhilun Zhang ◽  
Ying-bin Xing ◽  
Lei Liao ◽  
...  
Keyword(s):  
Pulsed Laser ◽  
Laser Generation ◽  
Parasitic Oscillation

Analysis of Ultrasonic Signals Generated by Pulsed Laser Action on a Metal Plate

2013 ◽  
Vol 330 ◽  
pp. 961-966
Author(s):  
Yan Xing Song ◽  
Jing Wang ◽  
Qi Bo Feng ◽  
Shi Qian Chen
Keyword(s):  
Ultrasonic Transducer ◽  
Influence Factors ◽  
Laser Action ◽  
Pulsed Laser ◽  
Metal Plate ◽  
Ultrasonic Signals ◽  
Detection Point ◽  
Input Parameters ◽  
The Difference ◽  
Ultrasonic Propagation

An approach of detecting ultrasonic signals generated by pulsed laser is studied. The influence factors are analyzed on the received signals. Based on pulsed laser generating ultrasonic, a metal plate is used as a detected target. The ultrasonic is induced by way of combining high-power pulsed laser with optical attenuation unit, and then received by a piezoelectric ultrasonic transducer. The difference between ablation regime and thermo elasticity with different pulsed laser input parameters are compared. Moreover the ultrasonic propagation under different thickness of metal plate and the impacts of relative position of stimulating point and detection point on ultrasonic signal is researched. The validity of this method is demonstrated through these experiments and the laser input parameters are determined when in thermo elasticity.

Mesoporous Carbon Nanospheres as Broadband Saturable Absorbers for Pulsed Laser Generation

2018 ◽  
Vol 6 (16) ◽  
pp. 1800606 ◽  
Author(s):  
Fang Wang ◽  
Ying Jing ◽  
Zhe Kang ◽  
Libo Zhou ◽  
Zhenrui Li ◽  
...  
Keyword(s):  
Mesoporous Carbon ◽  
Pulsed Laser ◽  
Laser Generation ◽  
Carbon Nanospheres ◽  
Saturable Absorbers

The effect of carboxymethylcellulose host concentration on the performance of mode-locked pulsed laser generation

2021 ◽  
Vol 122 ◽  
pp. 111699
Author(s):  
Harith Ahmad ◽  
Hafiz Hamsan ◽  
Siti Aisyah Reduan ◽  
Nur Farahin Norisham
Keyword(s):  
Pulsed Laser ◽  
Laser Generation

A pulsed photoacoustic investigation of ultrasonic mode conversion

1986 ◽  
Vol 64 (9) ◽  
pp. 1334-1340 ◽  
Author(s):  
D. A. Hutchins ◽  
F. Nadeau ◽  
P. Cielo
Keyword(s):  
Nondestructive Testing ◽  
Surface Waves ◽  
Mode Conversion ◽  
Pulsed Laser ◽  
Longitudinal Shear ◽  
Laser Generation ◽  
Bulk Waves ◽  
Interferometric Detection

Experiments have been undertaken into the generation and detection of ultrasonic transients in metals over a 40-MHz bandwidth, using pulsed-laser generation and interferometric detection. Longitudinal, shear, and surface waves have been investigated, and their form compared favorably to theory. The techique has been used to study the interaction of surface and bulk waves with slots in the surface of a plate. It has been shown that significant mode conversion occurred from surface to bulk waves and vice versa. The significance of this result to nondestructive testing is discussed.

Nanosecond pulsed laser generation of holographic structures on metals

2016 ◽  
Author(s):  
Krystian L. Wlodarczyk ◽  
Marcus Ardron ◽  
Nick J. Weston ◽  
Duncan P. Hand
Keyword(s):  
Pulsed Laser ◽  
Laser Generation ◽  
Nanosecond Pulsed Laser
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