Numerical study of ultra-short laser ablation of metals and of laser plume dynamics

Itina, Tatiana; Vidal, François; Delaporte, Philippe; Sentís, M.

doi:10.1007/s00339-004-2647-5

Cited by 22 publications

(8 citation statements)

References 21 publications

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“…[1][2][3][4][5] However, in spite of numerous efforts, the fundamental mechanisms of ultrashort laser ablation are still poorly understood. [6][7][8][9][10] Laser induced electron emission has raised interest for several applications, such as photocathodes for free electron lasers and ultrashort x-ray pulses. [11][12][13][14] It has also been widely used to measure excited electron lifetimes and for the study of ultrafast electron dynamics in metallic surfaces, as well as surface states.…”

Section: Introductionmentioning

confidence: 99%

Space charge corrected electron emission from an aluminum surface under non-equilibrium conditions

Wendelen

Mueller

Autrique

et al. 2012

Journal of Applied Physics

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A theoretical study has been conducted of ultrashort pulsed laser induced electron emission from an aluminum surface. Electron emission fluxes retrieved from the commonly employed Fowler-DuBridge theory were compared to fluxes based on a laser-induced non-equilibrium electron distribution. As a result, the two-and three-photon photoelectron emission parameters for the Fowler-DuBridge theory have been approximated. We observe that at regimes where photoemission is important, laser-induced electron emission evolves in a more smooth manner than predicted by the Fowler-DuBridge theory. The importance of the actual electron distribution decreases at higher laser fluences, whereas the contribution of thermionic emission increases. Furthermore, the influence of a space charge effect on electron emission was evaluated by a one dimensional particle-in-cell model. Depending on the fluences, the space charge reduces the electron emission by several orders of magnitude. The influence of the electron emission flux profiles on the effective electron emission was found to be negligible. However, a non-equilibrium electron velocity distribution increases the effective electron emission significantly. Our results show that it is essential to consider the non-equilibrium electron distribution as well as the space charge effect for the description of laser-induced photoemission. V

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Section: Introductionmentioning

confidence: 99%

Space charge corrected electron emission from an aluminum surface under non-equilibrium conditions

Wendelen

Mueller

Autrique

et al. 2012

Journal of Applied Physics

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“…A typical hydrodynamic model is based on the solution of a system of either Lagrangian [128] or Eulerian hydrodynamics [129]. These equations were extended to the case of two-temperature hydrodynamics and supplemented by a laser energy absorption source, electron heat conductivity and electron-phonon energy exchange terms [130].…”

Section: Fundamentals Of Laser-matter Interactionsmentioning

confidence: 99%

Nanoparticle Generation by Double-Pulse Laser Ablation

Axente¹,

Itina²,

Hermann³

2018

Pulsed Laser Ablation

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The purpose of this chapter is to give a critical review of the processes involved in the generation of nanoparticles by material ablation with two time-delayed laser pulses. Experimental investigations of the ablation characteristics during nanoparticle synthesis with short double pulses are presented. In particular, the composition and the expansion dynamics of the ablated material are examined. The latest progress achieved in modeling laser-matter interactions in double pulse regime is discussed. The correlation between ablation efficiency and nanoparticle generation is assessed and compared with numerical simulations, the influence of interpulse delay on metals ablation being revealed.

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“…The target hydrodynamic expansion process should be described by two-temperature hydrodynamic equations. For metals, the equations in the 1D form are given by [34,56,57]:…”

Section: Hydrodynamic Expansionmentioning

confidence: 99%

Micro‐Laser Processing

Özel²

2011

Micro‐Manufacturing

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INTRODUCTIONThe use of laser technology in the processing of materials for micro-products has been reported over the last decade. Laser-based material processing on a microscale has been used in thermal processing, shock peening, surface treatment, cleaning of surfaces, welding, melting and polishing, scribing, as well as micromachining of basic geometric features on a variety of materials [1][2][3][4][5][6][7][8][9][10][11][12].Lasers are usually categorized as two groups: continuous wave (cw) and pulsed lasers. Conventional cw and pulsed laser irradiation and ablation is used in many fields, such as material processing, machining, etching, deposition, sintering, micro-fluidics, medical, and many other applications [13][14][15][16][17][18][19].The use of lasers in micro-manufacturing is closely connected to the characteristics of the laser. The main laser parameters to be chosen and controlled are wavelength, λ (nm); average power (W) or energy (J); intensity (W/m 2 ) or fluence, ( ) (J/m 2 ); pulse duration, τ (s); pulse repetition rates (Hz); and peak power (pulse energy/pulse duration) [9,11,16,20,21].Pulsed lasers achieve much higher intensities than cw lasers and are the preferred solution for the fabrication of micro-sized structures. Long-pulsed (nanosecond, ns), short-pulsed (picoseconds, ps), and ultrashort-pulsed (femtosecond, fs) lasers that are commonly used for repairing, trimming, marking, scribing, texturing, welding, ablation, cutting, and drilling include among others (i) Excimer lasers with ultraviolet (UV) wavelengths, (ii) Ti:sapphire lasers Micro-Manufacturing: Design and Manufacturing of Micro-Products, First Edition. Edited by Muammer Koç and TugrulÖzel.

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Numerical study of ultra-short laser ablation of metals and of laser plume dynamics

Cited by 22 publications

References 21 publications

Space charge corrected electron emission from an aluminum surface under non-equilibrium conditions

Space charge corrected electron emission from an aluminum surface under non-equilibrium conditions

Nanoparticle Generation by Double-Pulse Laser Ablation

Micro‐Laser Processing

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