Enhancement of pulsed laser ablation assisted with continuous wave laser irradiation

Continuous wave (CW) laser irradiation is employed to enhance the pulsed laser ablation of silicon and stainless steel (316L) samples. Different surface temperatures generated by the CW laser irradiation are set as the initial working circumstance for the pulsed laser ablation. The diameter and dept...

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Bibliographic Details
Published in:Science China. Physics, mechanics & astronomy mechanics & astronomy, 2019-03, Vol.62 (3), p.34211, Article 34211
Main Authors: Ding, Ye, Yang, LiJun, Hong, MingHui
Format: Article
Language:English
Subjects:
Ablation
Analysis
Astronomy
Classical and Continuum Physics
Continuous wave lasers
Diameters
Fluence
Geometry
Heat transfer
Irradiation
Laser ablation
Lasers
Morphology
Numerical analysis
Observations and Techniques
Physics
Physics and Astronomy
Plasma
Power
Pulsed lasers
Silicon
Simulation methods
Stainless steels
Steel, Stainless
Surface temperature
Temperature
Thermal diffusion
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Summary:Continuous wave (CW) laser irradiation is employed to enhance the pulsed laser ablation of silicon and stainless steel (316L) samples. Different surface temperatures generated by the CW laser irradiation are set as the initial working circumstance for the pulsed laser ablation. The diameter and depth of laser-ablated craters are measured to study threshold fluence, pulse incubation coefficient and ablation rate under different surface temperatures. Numerical simulation employing Heat Transfer in Solid and Deformed Geometry Interface modules in COMSOL is performed to estimate ablation rate theoretically based on Hertz-Knudsen equation. The realized crater-related data are analyzed to further obtain their dependences on surface temperature. The parametric and morphological studies indicate that the weakened plasma shielding effect and thermal diffusion in the ablated region induced by the CW laser irradiation lead to the enhanced pulsed laser ablation significantly.
ISSN:1674-7348
1869-1927
DOI:10.1007/s11433-018-9288-1