Femtosecond laser ablation of metals and crater formation by phase explosion in the high-fluence regime

Oh, Bonggi; Kim, Dongsik; Kim, Jaegu; Lee, Jae‐Hoon

doi:10.1088/1742-6596/59/1/121

Cited by 15 publications

(3 citation statements)

References 14 publications

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“…On the contrary, femto-second or pico-second laser ablations are occurred caused by complicate reasons such as phase explosion, shock, and spallation [2,3]. Usually, the laser irradiating process is completed in shorter time than the required equilibrium time between the electron and ion: therefore, clarification of femto-or pico-second laser ablation process is still unclear.…”

Section: Introductionmentioning

confidence: 99%

FEM based simulation of the pulsed laser ablation process in nanosecond fields

Lim

Yoo

2011

J Mech Sci Technol

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For the pulsed laser ablation in nanosecond fields, the key physical phenomenon of the removing process is thermal evaporation. For the process optimization of the nano-second laser ablation, it is essential to set up effective simulation that can reflect material absorption coefficient, energy intensity of laser, laser pulse shape, and so forth. In this research, material ablation in nano-second region is simulated by using a finite element method (FEM) commercial package and its result has been compared with experiment results focused on the difference in the ablation depth and its shape occurred after each laser pulse hitting. Finally, the effect of the parameter variation on the ablation process has been verified.

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Section: Introductionmentioning

confidence: 99%

FEM based simulation of the pulsed laser ablation process in nanosecond fields

Lim

Yoo

2011

J Mech Sci Technol

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“…Related studies have shown that changes in important parameters such as the average power of the laser, overlap rate, and out-of-focus amount affect the quality of small holes when processing them with femtosecond lasers [16][17][18][19][20][21][22][23][24][25][26]. There are many factors that affect the quality of laser hole making during processing, and the test could not test all combinations of factors at the same time.…”

Section: Introductionmentioning

confidence: 99%

Optimization of femtosecond laser drilling process for DD6 single crystal alloy

Du¹,

Liang²,

Yu³

et al. 2022

Preprint

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In this paper, we explore the optimal combination of femtosecond laser drilling parameters for micro-hole processing on DD6 single-crystal high-temperature alloy and analyze the significance of parameter variations on the microstructure characteristics of the holes. The L25(56) orthogonal test was performed by controlling six parameters during femtosecond laser ring processing: Average power, Overlap rate, Defocus rate, Feed amount, Gas pressure, and End position. It is found that the entrance of the micro-holes has good roundness, while a large variation in diameter is observed. The exit of the holes exhibits poor roundness, and the diameter variation is intensified compared with the entrance, there are some with jagged edges. After the extreme difference analysis, it is concluded that the defocus has the most significant effect on the hole drilling by femtosecond laser ring processing for DD6 single crystal high-temperature alloy. The increase of laser average power leads to the decrease of hole taper, and the feed of 0.02 mm is beneficial for processing small taper through-hole. In addition, the outlet diameter of the holes increases with the increasing of gas pressure after the pressure is greater than 0.25 MPa, and the effect of the end is smaller and other regular conclusions. Through the integrated equilibrium method, the optimized combination of the femtosecond laser drilling parameters for 400 µm through-hole with minimum taper is as follows: power 7.84 W, overlap 99%, defocus + 0.4 mm, pressure 0.25 MPa, feed 0.02 mm and end + 0.2 mm.

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“…Otherwise, the Fourier model cannot be applied. As for a ultra-short laser source, that is, picosecond and femtosecond, the ablation processes are more complex, including normal vaporization, phase explosion, electrostatic ablation and spallation (Oh et al , 2007). Normally, for ultra-short laser ablation, the irradiating process is completed before the cooling down of the electron and ion (Lim and Yoo, 2011).…”

Section: Introductionmentioning

confidence: 99%

Finite element analysis of nanosecond pulsed laser ablation of various materials

Ren

Ahmed

Butt

2017

WJE

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Purpose The purpose of this paper is to analyse nanosecond pulsed laser ablation on both metallic materials and non-metallic materials; a comparison between metallic materials and non-metallic materials has also been included. Design/methodology/approach In this paper, FEM method has been used to calculate the result by means of the finite element method. Furthermore, all the analyses are based on thermal theories. Findings The paper presents a comparison of metallic and non-metallic materials. Besides, the effect of how laser parameter changes would influence the ablation depth has also been assessed. Research limitations/implications All studies in this paper are based on classical thermal theories. Thermal theories are not applicable some times. Originality/value With the results of this paper, suggestions are made so that experiments and manufactures could be optimised and improved.

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Femtosecond laser ablation of metals and crater formation by phase explosion in the high-fluence regime

Cited by 15 publications

References 14 publications

FEM based simulation of the pulsed laser ablation process in nanosecond fields

FEM based simulation of the pulsed laser ablation process in nanosecond fields

Optimization of femtosecond laser drilling process for DD6 single crystal alloy

Finite element analysis of nanosecond pulsed laser ablation of various materials

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