Ultrafast double pulses ablation of Cr film on glass

Han, Zehua; Zhou, Changhe; Dai, Enwen; Xie, Jin

doi:10.1016/j.optcom.2008.05.036

Cited by 16 publications

(10 citation statements)

References 13 publications

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“…Rather than the laser intensity of the individual pulse, the irradiation fluence has shown to be a key parameter for the formation of LIPSS on metals. Double pulse experiments have been carried out by several groups [34][35][36][37] to discuss the ablation rate dependence on the delay time between the two pulses. It was found that the ablation rate is characterized by the total fluence of the two pulses in the delay time range from 0 to 1 ps.…”

Section: Experimental Methods and Resultsmentioning

confidence: 99%

Periodic surface structures on titanium self-organized upon double femtosecond pulse exposures

Gemini

Hashida

Miyasaka

et al. 2015

Applied Surface Science

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Section: Experimental Methods and Resultsmentioning

confidence: 99%

Periodic surface structures on titanium self-organized upon double femtosecond pulse exposures

Gemini

Hashida

Miyasaka

et al. 2015

Applied Surface Science

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“…When the second pulse was irradiated to the activated area with a porous structure, the fracturing ablation occurred. Ultrafast laser ablation of the Cr film by using a double-pulse method was also investigated by Han et al [13]. Microbump structures were formed on the surface of Cr film after ablation with double ultrafast pulses.…”

Section: Introductionmentioning

confidence: 99%

Driving forces for self-organization in thin metal films during their partial ablation with a cylindrically focused laser beam

Gedvilas

Račiukaitis

Kucikas

et al. 2012

AIP Conference Proceedings

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Articles you may be interested inSimple formula for the interspaces of periodic grating structures self-organized on metal surfaces by femtosecond laser ablation Appl. Phys. Lett. 102, 174106 (2013); 10.1063/1.4803940Self-organized, gratinglike nanostructures in polymer films with embedded metal nanoparticles induced by femtosecond laser irradiation J. Appl. Phys. 108, 073114 (2010); 10.1063/1.3490191 Patterning polycrystalline thin films by defocused ion beam: The influence of initial morphology on the evolution of self-organized nanostructures Abstract. Metal films on transparent substrates are widely used in industry for mask production, and lasers are frequently applied for their patterning. The quality of patterning is limited by fundamental phenomena taking place close to edges of the laser ablated area. We investigated transformations in metal films experimentally and numerically during their irradiation with the laser beam with fluences above the ablation threshold. The beam of a nanosecond pulse laser tightly focused by aspheric cylindrical lens to a stripe (2.5 μm × 2.5 mm) was applied for the back-side ablation of the chromium thin film on a glass substrate. Two phases, the initiation and growth of periodical structures in a thin metal film, were distinguished. The prolonged holes were ablated with a single laser pulse. Ridges of the resolidified metal with increased but not uniform thickness were always present on edges of the cleaned area. Instabilities during the ablation process forced the molten metal in the ridges to agglomerate into droplets with the predictable periodicity. The average ratio of the droplet formation period to the radius of the resolidified ridge was found to be close to 9.0, which was a clear evidence of the Rayleigh-Plateau instability along the molten ridge. Use of overlapping laser pulses to extend the cleaned area initiated self-organization of chromium on the glass substrate. The droplets on ridges were starting points for formation of ripples from the metal film by irradiation with partially overlapping laser pulses. Growth of a highly periodical structure of metal on glass was observed in a certain range of process parameters, depending on the pulse energy and the beam overlap. The ripples were located with a period of 2.5-4 m parallel to the direction of the laser spot shift. The initial droplets and later the ripples were acting as heat sinks that cooled down the metal in their close proximity. The COMSOL finite element modeling revealed that temperature modulation along the laser irradiation spot was high enough to initiate the Marangoni effect which resulted in movement of the molten metal from hot to colder areas. After each laser pulse the process lasted as long as the liquid phase existed. The time when chromium remained in liquid phase was estimated to be as long as 100 ns. The distance that chromium in molten film traveled because of Marangoni convection before it solidified has been evaluated by multiplying Marangoni speed and lifetime of the liquid phase and i...

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“…In addition, we have used double pulses with separations of up to 3.4 ns in a pump probe experiment to study a transition region between two logarithmic fluence regimes. Fairly extensive experimental results have been reported on ''single pulse'' femtosecond metal ablation, though few specifically on silver [3,7] but results on dual (or multiple) pulse ablation have been rather more limited [18][19][20][21][22][23][24][25][26][27][28][29][30][31]. By dual pulse it is always understood that the pulse separation is much less than the interpulse period (typically 1 ms) of the train of amplified femtosecond pulses used for ablation.…”

Section: Introductionmentioning

confidence: 99%

“…These can range from electron lattice relaxation times or electron diffusion times (a few ps to a few 100 ps) to times for the development of the ablation plume (up to a few 1000 ps) [26][27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%