Impact of the lasr wavelength and fluence on the ablation rate of aluminium

Stafe, Mihai; Vladoiu, I.; Popescu, Ionel Cătălin

doi:10.2478/s11534-008-0026-0

Cited by 25 publications

(18 citation statements)

References 22 publications

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“…Our previous experiments on PLA indicated this logarithmic behaviour in the case of metals and, additionally, allowed us to identify a threshold fluence above which there is a sudden jump of the ablation rate [11]. The jump of the ablation rate at the threshold fluence was related to the superposition of two effects: the phase explosion, which refers to the transition from a superheated liquid to a mix of vapours and droplets that occurs when material surface pass the thermodynamic critical temperature, and the change of the dimensionality of the plasma plume hydrodynamics from one-dimensional to threedimensional [11,12,14,24,29].…”

Section: Introductionmentioning

confidence: 69%

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Influence of the pulse number and fluence of a nanosecond laser on the ablation rate of metals, semiconductors and dielectrics

Vladoiu

Stafe

Negutu

et al. 2009

Eur. Phys. J. Appl. Phys.

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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés. AbstractWe investigated the pulsed laser ablation of metallic (Al), semiconductor (Si), and wide bandgap dielectric (LiNbO 3 ) targets in air at normal atmospheric conditions by using 4.5 ns pulses at 532 nm wavelength. We determined the dependence of the ablation rate on the pulse number and laser fluence. The number of consecutive laser pulses hitting the target on the same area was between 5 and 40, and the laser fluence was varied in the range of 10-250 J/cm 2 by changing the irradiated area at the target surface. We find that the ablation rate of the three targets is approximately constant when the pulse number is smaller than 15. Further increase of the pulse number leads to a decrease of the ablation rate, the fastest decrease of the ablation rate with pulse number being observed for the dielectric target. The dependence of the ablation rate on the laser fluence indicates two different regimes. In the first regime, which is for values of the fluence smaller than the threshold value (~70 J/cm 2 for Al, ~90 J/cm 2 for Si, and ~180 J/cm 2 for LiNbO 3 ), the ablation rate increases approximately logarithmically with the fluence. In the second regime, characterized by values of the fluence greater than the threshold value, there is a steep increase of the ablation rate. This sudden jump of the ablation rate at the threshold fluence is due to the transition from normal vaporisation to phase explosion, and to the changes in the dimensionality of the plasma-plume hydrodynamics from one-dimensional to three-dimensional.

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Section: Introductionmentioning

confidence: 69%

“…The characteristics of the laser beam, ablated material, and ambient atmosphere strongly influences the ablation rate [1][2][3][4][5][6]8,[11][12][13][14][15][16][17][18][19][20][21][22][23]. Previous experiments on PLA in multipulse regime indicated that the ablation rate of metals decreases exponentially with pulse number [1,17].…”

Section: Introductionmentioning

confidence: 99%

Influence of the pulse number and fluence of a nanosecond laser on the ablation rate of metals, semiconductors and dielectrics

Vladoiu

Stafe

Negutu

et al. 2009

Eur. Phys. J. Appl. Phys.

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“…4 continues to increase with fluence, which indicates that the absorbed fluence continues to increase with fluence rather than saturate. Similarly, other studies [20][21][22][23]25] have shown that the ablation depth continues to increase with fluence above the phase explosion threshold, which would not be expected if significant shielding occurred.…”

Section: Resultsmentioning

confidence: 90%

Nanosecond Time-Resolved Measurements of Transient Hole Opening During Laser Micromachining of an Aluminum Film

Hendijanifard¹,

Willis

2013

Journal of Heat Transfer

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Laser micromachining of an aluminum film on a glass substrate is investigated using a time-resolved transmission imaging technique with nanosecond resolution. Micromachining is performed using a 7 ns pulse-width Nd:YAG laser operating at the 1064 nm wavelength for fluences ranging from 2.2 to 14.5 J/cm 2 . A nitrogen laser-pumped dye laser with a 3 ns pulse-width and 500 nm wavelength is used as a light source for visualizing the transient hole area. The dye laser is incident on the free surface and a CCD camera behind the sample captures the transmitted light. Images are taken from the back of the sample at various time delays with respect to the beginning of the ablation process, allowing the transient hole area to be measured. For low fluences, the hole opening process is delayed long after the laser pulse and there is significant scatter in the data due to weak driving forces for hole opening. However, for fluences at and above 3.5 J/cm 2 , the starting time of the process converges to a limiting minimum value of 12 ns, independent of laser fluence. At these fluences, the rate of hole opening is rapid, with the major portion of the holes opened within 25 ns. The second stage of the process is slower and lasts between 100 and 200 ns. The rapid hole opening process at high fluences can be attributed to recoil pressure from explosive phase change. Measurements of the transient shock wave position using the imaging apparatus in shadowgraph mode are used to estimate the pressure behind the shock wave. Recoil pressure estimates indicate pressure values over 90 atm at the highest fluence, which decays rapidly with time due to expansion of the ablation plume. The recoil pressure for all fluences above 3.1 J/cm 2 is higher than that required for recoil pressure driven flow due to the transition to explosive phase change above this fluence.

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“…Horn et al 14 showed that ablation rate of aluminum in noble gas environment increases by increase of the laser wavelength, while Stafe et al 15 have reported against it. There are also contradictions in wavelength effect on size of nanoparticles, as some papers reported increase 17 and some others announced decrease 5,12,16 of the size by increase of the laser wavelength.…”

Section: Introductionmentioning

confidence: 99%

“…Effect of laser wavelength on ablation efficiency and size of nanoparticles are not clearly agreed, as there are paradoxes about them 5,12,[14][15][16][17] . Horn et al 14 showed that ablation rate of aluminum in noble gas environment increases by increase of the laser wavelength, while Stafe et al 15 have reported against it.…”

Section: Introductionmentioning

confidence: 99%

EFFECT OF LASER WAVELENGTH AND ABLATION TIME ON PULSED LASER ABLATION SYNTHESIS OF AL NANOPARTICLES IN ETHANOL

Baladi

Sarraf-Mamoory

2012

Int. J. Mod. Phys. Conf. Ser.

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Aluminum nanoparticles were synthesized by pulsed laser ablation of Al targets in ethanol for 5-15 minutes using the 1064 and 533 nm wavelengths of a Nd:YAG laser with energies of 280-320 mJ per pulse. It has been found that higher wavelength leads to significantly higher ablation efficiency, and finer spherical nanoparticles are also synthesized. Besides, it was obvious that higher ablation time resulted in higher ablated mass, while lower ablation rate was observed. Finer nanoparticles, moreover, are synthesized in higher ablation times.

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Impact of the lasr wavelength and fluence on the ablation rate of aluminium

Cited by 25 publications

References 22 publications

Influence of the pulse number and fluence of a nanosecond laser on the ablation rate of metals, semiconductors and dielectrics

Influence of the pulse number and fluence of a nanosecond laser on the ablation rate of metals, semiconductors and dielectrics

Nanosecond Time-Resolved Measurements of Transient Hole Opening During Laser Micromachining of an Aluminum Film

EFFECT OF LASER WAVELENGTH AND ABLATION TIME ON PULSED LASER ABLATION SYNTHESIS OF AL NANOPARTICLES IN ETHANOL

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