Optical emission imaging and spectroscopy during femtosecond laser ablation of thin metal films on flexible polymer substrates

Düsing, Jan Friedrich; Hwang, David J.; Grigoropoulos, Costas P.; Ostendorf, Andreas; Kling, Rainer

doi:10.2351/1.5061659

Cited by 4 publications

(4 citation statements)

References 6 publications

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“…When the fluence is increased above the ablation threshold, the intensity of both pressure waves is increased and, as a result of the lower density of the rarefaction wave, a fragmentation of surface layers takes place (spallation regime). The travel velocity of such dense layers evolving from the surface for metals lies in the range of several 100 m/s [ 45 , 46 , 54 , 55 , 56 , 57 ]. If the fluence is increased above values of approximately 10 times the ablation threshold, not only spallation takes place but the upper surface layers (in this representation on the left) disintegrate and show a transition into the gaseous phase.…”

Section: Physics Of Ultra-short Burst Pulse Ablation Of Metalsmentioning

confidence: 99%

“…Although not displayed here, atoms in the gaseous phase also become ionized for higher fluences, and some regions reach temperatures of several 1000 K or more [ 45 , 46 , 54 , 55 , 56 , 57 ]. If successive pulses have inter-pulse delays of several tens of microseconds or more (corresponding to repetition rates of

100 kHz or less), a subsequent pulse does not significantly interact with the ablation plume of its preceding pulse [ 58 ].…”

Section: Physics Of Ultra-short Burst Pulse Ablation Of Metalsmentioning

confidence: 99%

“…If the fluence is increased above values of approximately 10 times the ablation threshold, not only spallation takes place but the upper surface layers (in this representation on the left) disintegrate and show a transition into the gaseous phase. Particles and clusters in the gaseous phase then travel principally with the speed of sound (of the initial bulk material), which lies in the range of several km/s [45,46,[54][55][56][57]. Results from molecular dynamics (MD) simulations for single pulse irradiation of aluminum.…”

Section: Single Pulse Laser Ablationmentioning

confidence: 99%

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Review on Experimental and Theoretical Investigations of Ultra-Short Pulsed Laser Ablation of Metals with Burst Pulses

et al. 2021

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Laser processing with ultra-short double pulses has gained attraction since the beginning of the 2000s. In the last decade, pulse bursts consisting of multiple pulses with a delay of several 10 ns and less found their way into the area of micromachining of metals, opening up completely new process regimes and allowing an increase in the structuring rates and surface quality of machined samples. Several physical effects such as shielding or re-deposition of material have led to a new understanding of the related machining strategies and processing regimes. Results of both experimental and numerical investigations are placed into context for different time scales during laser processing. This review is dedicated to the fundamental physical phenomena taking place during burst processing and their respective effects on machining results of metals in the ultra-short pulse regime for delays ranging from several 100 fs to several microseconds. Furthermore, technical applications based on these effects are reviewed.

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Section: Physics Of Ultra-short Burst Pulse Ablation Of Metalsmentioning

confidence: 99%

100 kHz or less), a subsequent pulse does not significantly interact with the ablation plume of its preceding pulse [ 58 ].…”

Section: Physics Of Ultra-short Burst Pulse Ablation Of Metalsmentioning

confidence: 99%

Section: Single Pulse Laser Ablationmentioning

confidence: 99%

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Review on Experimental and Theoretical Investigations of Ultra-Short Pulsed Laser Ablation of Metals with Burst Pulses

et al. 2021

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“…The plasma was initially characterized by a Maxwell-Boltzmann distribution with an electron temperature Te = 1 keV and an ion temperature T i = 0.1 keV. [21][22][23][24] Figure 4 shows the volume-rendered images of the electron density at t = 500 fs for Fig. 4(a-1) single pulse irradiation and Fig.…”

Section: Three-dimensional Electromagnetic Particle-in-cell Simulatio...mentioning

confidence: 99%

Uniformity evaluation of laser-induced periodic surface structures formed by two-color double-pulse femtosecond laser irradiation

Takenaka

Hashida

Sakagami

et al. 2022

Review of Scientific Instruments

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The Perpendicular Period and Phase Scanning (P3S) method can evaluate the uniformity of a laser-induced periodic surface structure (LIPSS). P3S assesses the uniformity of LIPSS using the standard deviation of the peak period and the average of the phase difference in the direction perpendicular to LIPSS. The P3S method demonstrates that LIPSS formed by two-color double-pulse irradiation is reduced to a quarter of the period dispersion, and the average phase difference of LIPSS is also reduced compared to the single-pulse irradiation. In addition, a 3D electromagnetic particle-in-cell simulation was performed to evaluate the possibility of an improved uniformity of LIPSS. The results confirm that the two-color double-pulse irradiation produces a uniform LIPSS and validates the effectiveness of the P3S method to assess the uniformity of LIPSS.

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Ablation characteristics on silicon from ultrafast laser radiation containing single MHz and GHz burst pulses

et al. 2022

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The authors present results of ablation on silicon with ultrafast laser radiation featuring burst pulses using an amplified burst-mode solid-state laser, featuring an emitting wavelength of 1030 nm to generate single burst cavities on silicon. Laser parameter are varied for different pulse durations from 270 fs up to 10 ps, burst fluences, and number of sub-pulses per burst in the respective burst regime with sub-pulse repetition rates of 65 MHz and 5 GHz. The resulting ablated volume per burst and per sub-pulse in a burst as well as the topography are investigated and discussed.

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Optical emission imaging and spectroscopy during femtosecond laser ablation of thin metal films on flexible polymer substrates

Cited by 4 publications

References 6 publications

Review on Experimental and Theoretical Investigations of Ultra-Short Pulsed Laser Ablation of Metals with Burst Pulses

Review on Experimental and Theoretical Investigations of Ultra-Short Pulsed Laser Ablation of Metals with Burst Pulses

Uniformity evaluation of laser-induced periodic surface structures formed by two-color double-pulse femtosecond laser irradiation

Ablation characteristics on silicon from ultrafast laser radiation containing single MHz and GHz burst pulses

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