Inverse dependence of heat accumulation on pulse duration in laser surface processing with ultrashort pulses

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F49777513%3A23210%2F23%3A43969043" target="_blank" >RIV/49777513:23210/23:43969043 - isvavai.cz</a>

Alternative codes found

RIV/49777513:23640/23:43969043

Result on the web

<a href="https://doi.org/10.1016/j.ijheatmasstransfer.2023.124328" target="_blank" >https://doi.org/10.1016/j.ijheatmasstransfer.2023.124328</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.ijheatmasstransfer.2023.124328" target="_blank" >10.1016/j.ijheatmasstransfer.2023.124328</a>

Result language

angličtina

Original language name

Inverse dependence of heat accumulation on pulse duration in laser surface processing with ultrashort pulses

Original language description

Laser pulse duration is one of the important parameters that is able to dramatically change ablation efficiency. Shorter laser pulse duration leads to deeper transport of absorbed energy in subsurface material layers. Ultra-fast and non-equilibrium processes are able to remarkably affect residual energy, which is accumulated in the deeper subsurface layers after ablation. On the other hand, undesirably high heat accumulation leads to material overheating with surface oxidation, appearance of liquid phase and, as a result, low processing quality. In this paper, the influence of laser pulse duration on the heat accumulation value was experimentally evaluated for the first time. Heat accumulation was measured with a highly sensitive fast infrared detector. The results were presented in comparison with surface structure analysis, material ablation rate and optical reflectivity. Unexpected inverse dependence of heat accumulation on laser pulse duration was detected. An optimal laser pulse duration near 1 ps corresponds to the maximum heat accumulation value and also highest ablation efficiency in contrast to longer laser pulses. The same optimal pulse duration value was detected for low frequency (250 kHz) and for high frequency (1 MHz) laser surface processing regimes. The maximum heat accumulation value was expected at the longest laser pulses. The results are discussed from the point of view of the two-temperature model.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

20506 - Coating and films

Project

<a href="/en/project/TH75020001" target="_blank" >TH75020001: Advanced coating substrate preparation by shifted and ultrafast laser texturing</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2023

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER

ISSN

0017-9310

e-ISSN

1879-2189

Volume of the periodical

213

Issue of the periodical within the volume

OCT 2023

Country of publishing house

GB - UNITED KINGDOM

Number of pages

8

Pages from-to

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UT code for WoS article

001010729800001

EID of the result in the Scopus database

2-s2.0-85162192326