Modeling of annular long pulsed laser heating solid material using closed-form solutions

Chen, Guibo; Bi, Juan

doi:10.1016/j.ijleo.2017.01.101

Cited by 3 publications

(2 citation statements)

References 10 publications

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“…The organic contaminants readily absorb the energy emitted by the pulsed laser, subsequently leading to the dispersion of heat via thermal conduction. The thermal conduction equation employed in the simulation is defined by the subsequent formulation 28,29 i k j j j j j y { z z z z z…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Investigation of the Multimechanism Laser Cleaning Dynamics for Rough Fused Silica Surfaces with Organic Contaminants: A Computational Simulation and Atomic Analysis

Wang,

Bai,

et al. 2023

Langmuir

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The detrimental impact of organic contaminants on optical components poses a significant obstacle to high-energy laser systems. However, irregularities or defects on the surface of optical components during manufacturing can affect the process of organic contaminant removal. Thus, a comprehensive understanding of the intricate interplay among surface roughness, contaminant absorption, and ablation is essential to effectively address the challenges of laser-induced damage. In this study, a molecular dynamics approach was employed to investigate the interaction between laser-fused silica and contaminants and to analyze the influence of surface roughness on the removal of contaminants from fused silica. Research findings demonstrate that during laser irradiation, organic contaminants on the surface of mechanical components diffuse into the optical elements. As the laser flux increases, the contaminants gradually decompose into smaller molecular clusters. Additionally, the phenomenon of contaminant ablation is observed to consist of two distinct phases: the “Thermal expansion phase” and the “Thermal ablation phase.” The study examines the impact of substrate roughness on the contaminant removal in these two phases. It is found that a higher surface roughness leads to stronger thermal expansion and vaporization of contaminants. With increasing roughness of the fused silica substrate, the corresponding van der Waals energy and pressure decrease under the same laser fluence, making the removal of contaminants easier. These results provide valuable insights into the interaction between laser irradiation and organic contaminants.

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Section: ■ Materials and Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Investigation of the Multimechanism Laser Cleaning Dynamics for Rough Fused Silica Surfaces with Organic Contaminants: A Computational Simulation and Atomic Analysis

Wang,

Bai,

et al. 2023

Langmuir

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An analytic parametric study of rounded laser pulse heating

Türkyılmazoğlu

2021

Optik

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Experimental investigations on spatial and temporal laser irradiations in pulsed laser forming of thin metal sheets

Maji

2019

Journal of Laser Applications

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This article presents investigations on temporal- and spatial-pulsed laser irradiations on thermal sheet forming of 304 austenitic stainless steel sheets using a fiber laser. A response surface model was developed to predict deformations of thin sheets irradiated by a pulsed laser considering laser power, scan speed, spot diameter, pulse frequency, and duty cycle as inputs based on experimental data obtained following a central composite design of experiments. The results showed that bending deformation increased with increasing laser power and duty cycle and with decreasing scan speed and spot diameter. However, an optimum value of the pulse frequency was found for maximum deformation. Adaptive neuro-fuzzy inference system-based models were also employed to predict deformations in pulsed laser forming. The prediction accuracy of the developed models was found to be good. Then, the desirability function approach of an optimization technique was employed to determine the optimum process parameters corresponding to maximum and minimum deformations. A comparison of the pulse and continuous wave mode of laser forming for constant laser energy input revealed that the pulsed mode of laser forming is more effective in terms of generating a larger amount of deformation for both two- and three-dimensional shapes forming. Pulsed laser formed samples with surface melting were found with modified finer grain microstructures which could be beneficial for specific applications.

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Modeling of annular long pulsed laser heating solid material using closed-form solutions

Cited by 3 publications

References 10 publications

Investigation of the Multimechanism Laser Cleaning Dynamics for Rough Fused Silica Surfaces with Organic Contaminants: A Computational Simulation and Atomic Analysis

Investigation of the Multimechanism Laser Cleaning Dynamics for Rough Fused Silica Surfaces with Organic Contaminants: A Computational Simulation and Atomic Analysis

An analytic parametric study of rounded laser pulse heating

Experimental investigations on spatial and temporal laser irradiations in pulsed laser forming of thin metal sheets

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