Hydrodynamic regimes of UV laser ablation of polymers

Afanasiev, Yu. V.; Исаков, В. А.; Zavestovskaya, I. N.; Chichkov, Boris N.; Alvensleben, F. von; Welling, H.

doi:10.1007/s003390050517

Cited by 27 publications

(20 citation statements)

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“…They indicated that the generalized laser drilling model was a significant improved version of the previous model based on switch-on and switch-off technique for melting and solidification process. The applicability of hydrodynamic models for UV laser ablation of polymers was studied by Afanasiev et al [5]. They obtained an analytical expression for ablation depth per pulse and indicated that the results were in good agreement with the experimental findings.…”

Section: Introductionmentioning

confidence: 89%

Laser heating of sheet metal and thermal stress development

Khan¹,

Yilbaş²

2004

Journal of Materials Processing Technology

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Section: Introductionmentioning

confidence: 89%

Laser heating of sheet metal and thermal stress development

Khan¹,

Yilbaş²

2004

Journal of Materials Processing Technology

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“…In both cases the vapours of ablated material are transparent to the incident radiation [2][3][4][5][6]. When the excitation energy exceeds the binding energy of a target material, bond breaking may happen and the target ablation takes place.…”

Section: Laser Light Absorptionmentioning

confidence: 99%

“…(6) indicates that the product of the absorbed laser intensity and the square root of laser pulse duration should be constant for optimal target evaporation. (6) indicates that the product of the absorbed laser intensity and the square root of laser pulse duration should be constant for optimal target evaporation.…”

Section: Heat Conduction Regimementioning

confidence: 99%

<title>Ultrafast ablation with high-pulse-repetition-rate lasers: I. Theoretical considerations</title>

Gamaly¹,

Rode

1998

SPIE Proceedings

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The novel technique for deposition of a high quality thin films of different materials by the use of picosecond laser pulses delivered on a target with the repetition rate of several tens of megahertz is proposed. The differences of the proposed method from the conventional pulse laserdeposition is due to shorter laser pulses (picosecond instead of nanosecond) and higher repetition rate which is tens of megahertz (MHz) instead of tens of hertz (Hz). The method allows us to significantly improve the quality of a film due to a decrease by nine orders of magnitude in a number of particles evaporating during a single laser pulse in comparison to that produced by nanosecond, 30 Hz lasers, thus removing a major disadvantage of laser deposition method which is the formation of particulates on the film.The use of a very high repetition rate laser also leads to a qualitatively new mode of vapour-substrate interaction. Due to the short time (107_108 sec) between the laser pulses a quasi-continuous laser plume is formed. The particles evaporated by the previous laser pulse and just deposited on the substrate do not cool down significantly by the time when the particles from the following laser pulse arrive, and therefore their chemical bonds are still reactive. As a result, the high repetition rate regime of evaporation allows for formation of structures on the substrate such as, for example, carbon nanotubes, polymer chains, etc. Another advantage is the opportunity of scanning the laser focal spot over different targets of different materials which allows for a deposition of multilayered films containing mono-atomic layers of different atoms.The results on ultrafast laser ablation and deposition are presented in two joint papers. In this paper (Part I) we present the theoretical justification of the ultrafast laser deposition method, calculating the vapour characteristics, evaporation and deposition rates for the optimal evaporation regime for different modes of laser-target interaction. In the second paper (Part II) the experimental results on evaporation of a graphite target, deposition of high quality diamond-like (DLC) films and the comparison of the laser plume characteristics to theory are presented. I.

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“…Considerable research studies were carried out to examine laser melting of metallic surfaces (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20). As the heating duration or the intensity of the laser beam increases, phase change takes place at the irradiated surface.…”

Section: Introductionmentioning

confidence: 99%

Laser Heating and the Phase Change Process

Yilbaş

2014

Comprehensive Materials Processing

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Hydrodynamic regimes of UV laser ablation of polymers

Cited by 27 publications

References 0 publications

Laser heating of sheet metal and thermal stress development

Laser heating of sheet metal and thermal stress development

<title>Ultrafast ablation with high-pulse-repetition-rate lasers: I. Theoretical considerations</title>

Laser Heating and the Phase Change Process

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