The investigation of optical characteristics of metal target in high power laser ablation

Li, Li; Duan-Ming, Zhang; Li, Zhihua; Guan, Li; Tan, Xiaotian; Fang, Ranran; Hu, Dezhi; Liu, Gaobin

doi:10.1016/j.physb.2006.03.010

Cited by 21 publications

(10 citation statements)

References 23 publications

(23 reference statements)

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“…For our numerical computation a Cu target is considered, and all Cu parameters needed for the computation are taken from [5,24]. For the laser beam, we will investigate the effects of three wavelengths, 266, 532, and 1064 nm; three pulse durations, 5, 10, and 15 ns; and two laser irradiances, 10 12 and 10 13 W∕m 2 .…”

Section: Numerical Computational Resultsmentioning

confidence: 99%

“…8. In order to study the influence of the optical parameters of the material, when they are supposed to be temperaturedependent, the Hagen-Rubens approximation is admitted [23,24], and the following expressions for both the absorptivity and the absorption coefficient are then valid:…”

Section: Thermal Processes Inside the Targetmentioning

confidence: 99%

“…Above, α T is the material temperature coefficient, λ the laser wavelength, and T a the ambient temperature. We made sure to use frequencies verifying the above-stated relation [3,24], we used IR and UV frequencies for Cu and Fe, respectively, and in addition to IR and UV laser beams we investigated the influence of variable optical parameters using a visible laser pulse.…”

Section: Thermal Processes Inside the Targetmentioning

confidence: 99%

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Theoretical and numerical study of the interaction of a nanosecond laser pulse with a copper target for laser-induced breakdown spectroscopy applications

et al. 2013

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International audienceThis work is a presentation of a modeling approach aimed at describing laser-matter interaction under laser-induced breakdown spectroscopy operating conditions. In order to set up a simple numerical tool to compute our model, only the most relevant processes appearing during the interaction were considered. This allowed us to develop a quick and rather accurate idea about how some physical parameters evolve during the interaction, so that the optimization of the laser beam parameters for better analytical results would be possible. For a basic understanding we used for our numerical computation a nanosecond laser pulse with an ideal Gaussian temporal profile and a pure Cu target. In order to optimize the interaction parameters, this study was focused on the effect of some of the laser parameters such as the wavelength (UV, Vis, IR), the pulse duration, and the irradiation on the results of the interaction. An investigation of the influence of some processes such as the vaporization effects and the plasma shielding was also included. The processes occuring on the material surface were closely examined as well. A comparison between the use of temperature-dependent and temperature-independent optical parameters was conducted, and their influence on the results was investigated. The use of variable optical parameters is revealed to be a means to correct the values of the temperature distribution inside the material and convert them into more realistic ones. Our code was first validated when operating under the same conditions used by other authors, and then it was used to present our proper contributions, as previously stated. (C) 2013 Optical Society of Americ

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Section: Numerical Computational Resultsmentioning

confidence: 99%

Section: Thermal Processes Inside the Targetmentioning

confidence: 99%

Section: Thermal Processes Inside the Targetmentioning

confidence: 99%

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Theoretical and numerical study of the interaction of a nanosecond laser pulse with a copper target for laser-induced breakdown spectroscopy applications

et al. 2013

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“…79,81 Many researchers have modeled the ablation phenomenon for nanosecond pulses of with analytical and/or numerical techniques. [82][83][84][85][86][87][88][89][90][91][92][93][94][95][96] An energy balance criterion was used to predict the amount of ablated material by Singh et al 82,83 Studies on plasma shielding, its expansion and deposition were also carried out. According to Singh et al, 83 for laser interaction with plasma and the target, radiation absorption is strong at distances very close to the target surface, where densities of the plasma species are very high.…”

Section: Dynamic Response Of Matter In the Ablation Regimeplasma Formmentioning

confidence: 99%

A Review of Simulation Methods of Laser Matter Interactions Focused on Nanosecond Laser Pulsed Systems

Kaselouris

Nikolos

Orphanos

et al. 2013

J. Multiscale Modelling

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A review study of the developments in the field of pulsed laser-solid interaction simulation methods, for moderate laser energies, is presented. The paper is focused on the methods that numerically simulate the interactions of pulsed ns-laser with solid metal targets. Three main regimes for pulsed laser excitation, are well established, namely, the thermoelastic, melting and plasma regimes. The modelling and simulation techniques that may numerically describe these three regimes and the occurring dynamic matter responses are reviewed. Modelling efforts concerning various fields of applications of lasers are briefly discussed.

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“…q 0 is the maximum pulse power. q(t) is the Gaussian temporal function of the laser beam intensity distribution [12][13][14] . a is the required value related to the optical property of the material.…”

mentioning

confidence: 99%

A unified model in the pulsed laser ablation process

2008

Optoelectron. Lett.

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In this unified model, we introduce the electron-phonon coupling time (t ie ) and laser pulse width (t p ). For long pulses, it can substitute for the traditional thermal conduction model; while for ultrashort pulses, it can substitute for the standard twotemperature model. As an example of the gold target, we get the dependence of the electron and ion temperature evolvement on the time and position by solving the thermal conduction equation using the finite-difference time-domain (FDTD) method.It is in good agreement with experimental data. We obtain the critical temperature of the onset of ablation using the Saha equation and then obtain the theoretical value of the laser ablation threshold when the laser pulse width ranges from nanosecond to femtosecond timescale, which consists well with the experimental data.With the development and the application of the ultra-short high-power laser, the effect of non-Fourier thermal conduction in pulsed laser ablation is noted as remarkable [1] . Then the two-temperature models have been established to describe the new phenomenon [2][3][4] . But for the long-pulse laser, we still adopt the traditional thermal conduction model (TCM) [5][6][7][8] . As a result, it is a complicated question that there is no model suitable for the pulse width from nanosecond to femtosecond timescale.In this paper, we present a unified model that can describe the thermal conduction phenomenon as the laser pulse width ranges from nanosecond to femtosecond timescale.As an example of the gold target, we get the dependence of the electron and ion temperature evolvement on the time and position by solving the thermal conduction equation using FDTD method. It is in good agreement with the experimental data.Many experimental and theoretical studies demonstrate the presence of two different ablation mechanisms [9] : thermal ablation and non-equilibrium ablation. If the laser pulse duration (t p ) is more than the electron-phonon coupling time, a material can go through the thermal melting and subsequent thermal phenomenon, so called thermal ablation. If the pulse width is smaller than this time (t ie ), the ablation mechanism is called non-equilibrium ablation. Usually, the electronphonon coupling time (t ie ) is several picoseconds [10,11] .When the laser irradiates the surface of the target, the electron absorbs considerable laser energy firstly because the electron mass is far smaller than the ion mass. The electron energy increases sharply. At the same time, electrons exchange energy with each other by colliding. Then the electron subsystem reaches the thermal equilibrium after tens of femtoseconds. If the laser irradiates the target, the electron subsystem continues to absorb the laser energy. And its temperature increases continually. At the same time, the ion absorbs little energy. The ion temperature is almost unchanged. It induces the tremendous difference of the temperature between the ion and the electron subsystem. Therefore, there are eigen temperature of the electron subsystems (T e ) and...

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The investigation of optical characteristics of metal target in high power laser ablation

Cited by 21 publications

References 23 publications

Theoretical and numerical study of the interaction of a nanosecond laser pulse with a copper target for laser-induced breakdown spectroscopy applications

Theoretical and numerical study of the interaction of a nanosecond laser pulse with a copper target for laser-induced breakdown spectroscopy applications

A Review of Simulation Methods of Laser Matter Interactions Focused on Nanosecond Laser Pulsed Systems

A unified model in the pulsed laser ablation process

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