On the possibility of laser pulse characterization based on displacements and temperatures at the back surface of the target body

Identification of parameters of laser beams is important in all applications of lasers. In this paper, results of numerical verification are presented for identification of parameters of pulsed, high-power laser beam based on displacement fields of the target body. It is considered how laser power a...

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Bibliographic Details
Main Authors: Pietrak, Karol, Łapka, Piotr, Kujawińska, Małgorzata
Format: Conference Proceeding
Language:English
Subjects:
Aluminum
Deformation mechanisms
Displacement
Finite element method
Finite volume method
High power lasers
Inverse problems
Laser beams
Lasers
Mechanical analysis
Parameter estimation
Parameter identification
Parameter sensitivity
Target recognition
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Summary:Identification of parameters of laser beams is important in all applications of lasers. In this paper, results of numerical verification are presented for identification of parameters of pulsed, high-power laser beam based on displacement fields of the target body. It is considered how laser power as well as spatial and temporal characteristics of the beam may be recovered based on measurements of thermally-caused deformation of thin aluminum plate. Mechanical displacement of the plate surface was calculated using Finite Element Method (FEM), for selected time instants, based on solutions of the unsteady thermal problem obtained with Finite Volume Method (FVM). Sensitivity of measured displacements to changes of recovered laser pulse parameters is discussed. Preliminary results of parameter estimation based solely on measurements of the Z-component of displacement field were compared with results of estimations based on measurements of temperatures. The comparison was made for inverse problems solved using Levenberg-Marquardt method applying synthetic measurement data instead of physical one. It was found that solutions of the inverse problem based on temperatures are better than those based on mechanical analysis.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.5092096