Ultrafast Breakdown of dielectrics: Energy absorption mechanisms investigated by double pulse experiments

Guizard, S.; Klimentov, S. M.; Mouskeftaras, Alexandros; Fedorov, N.; Geoffroy, G.; Vilmart, Gautier

doi:10.1016/j.apsusc.2014.11.036

Cited by 22 publications

(15 citation statements)

References 12 publications

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“…Other groups have reported on more efficient deposition of the laser energy into the material when bursts with a high number of sub-pulses are used [13]. Following from other studies [9][10][11]14,15], we have also predicted a possibility that a THz burst exhibits a similar interaction with the material as a proportionally longer single pulse under certain conditions. The latter assumption is in a disagreement with recent results of other groups on metal processing applications [13].…”

Section: Introductionsupporting

confidence: 60%

“…significantly lower ablation threshold per pulse compared to a single pulse) albeit explained with different physical mechanisms, such as heat accumulation [11], incubation [14], or ablation-cooling [9]. Dual and quad pulse bursts, achieved with single pulse splitting, were already used for different applications, including as a probe for energy absorption mechanisms [15], micromachining [16], laserinduced periodic surface structure formation [17] and multi-photon absorption enhancement [18]. The burst generation mechanism majorly affects the resulting intra-burst repetition frequency.…”

Section: Introductionmentioning

confidence: 99%

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Near-THz bursts of pulses – Governing surface ablation mechanisms for laser material processing

Mur

Petkovšek

2019

Applied Surface Science

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Laser operation in bursts of pulses has recently attracted a lot of attention, as high average powers and pulse energies have become available. Bursts of pulses have become a mean to achieve different laser-matter interaction regimes with a single laser source. We have used an ultra-short pulse laser source in combination with an external array of birefringent crystals to generate near-THz bursts of single-picosecond pulses. Variability of the setup and high single pulse energy were exploited to generate bursts of up to 16 pulses at different delays between consecutive pulses. The experimental setup was applied for surface processing of different industrially relevant materials, including metals, ceramics, and polyimides. The goal of this study was to find out if the reduced ablation thresholds using near-THz bursts of pulses as reported in previous studies of other group could be utilized for increased ablation efficiency. Our findings show that near-THz bursts of pulses interact with materials in a similar fashion as a single, albeit longer, pulse would. We observed a clear trend on all the tested materials, showing a declining ablation efficiency with increasing total burst duration at a fixed pulse repetition frequency. Findings contradict the results of other groups concluding on an improved efficiency of laser to material energy transfer using bursts at near-THz intra-burst repetition rates. A simple model describing ablation efficiency decline with pulse prolongation was used to compare the experimental data with theoretical predictions. Detailed analysis of surface ablation effects on metallic materials also revealed a presence of melting processes typically associated with laser pulses above 10 ps in duration as opposed to original 1.5 ps pulses.

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Section: Introductionsupporting

confidence: 60%

Section: Introductionmentioning

confidence: 99%

Near-THz bursts of pulses – Governing surface ablation mechanisms for laser material processing

Mur

Petkovšek

2019

Applied Surface Science

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“…Recently, two-color generated LIPSS on metals, dielectrics and semiconductors were investigated with varying inter-pulse delays and different polarizational orientations [10,[28][29][30][31]. In this work we extend our previous studies on dielectrics (fused silica [28]) and semiconductors (silicon [29]) to a metal such as titanium.…”

Section: Introductionmentioning

confidence: 65%

Laser-induced periodic surface structures on titanium upon single- and two-color femtosecond double-pulse irradiation

Höhm¹,

Rosenfeld²,

Krüger³

et al. 2015

Opt. Express

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Single- and two-color double-fs-pulse experiments were performed on titanium to study the dynamics of the formation of laser-induced periodic surface structures (LIPSS). A Mach-Zehnder inter-ferometer generated polarization controlled (parallel or cross-polarized) double-pulse sequences in two configurations - either at 800 nm only, or at 400 and 800 nm wavelengths. The inter-pulse delays of the individual 50-fs pulses ranged up to some tens of picoseconds. Multiple of these single- or two-color double-fs-pulse sequences were collinearly focused by a spherical mirror to the sample surface. In both experimental configurations, the peak fluence of each individual pulse was kept below its respective ablation threshold and only the joint action of both pulses lead to the formation of LIPSS. Their resulting characteristics were analyzed by scanning electron microscopy and the periods were quantified by Fourier analyses. The LIPSS periods along with the orientation allow a clear identification of the pulse which dominates the energy coupling to the material. A plasmonic model successfully explains the delay-dependence of the LIPSS on titanium and confirms the importance of the ultrafast energy deposition stage for LIPSS formation.

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“…The two-colour double-pulse irradiation has been used for laser-induced damage threshold (LIDT) testing of optical coatings [22][23][24][25], and has proved to reduce the damage threshold by 71% for Al 2 O 3 coating [26]. Better control in the energy deposition has been demonstrated during dual-wavelength double-pulse laser machining of dielectrics [27].…”

Section: Introductionmentioning

confidence: 99%

The behaviour of sapphire under intense two-colour excitation by picosecond laser

Gedvilas¹,

Stankevič²,

Račiukaitis³

2021

physics

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Ultrashort pulse lasers are evidencing their benefits in the processing of transparent materials. Sapphire is one of the most attractive engineering materials today. It is hard and, therefore, difficult to machine mechanically to the required shape. Laser dicing is one of the promising techniques for sapphire separation. Two-pulse two-colour irradiation was applied to initiate free-shape cutting of the material. Two collinear laser beams with wavelengths of 1064 and 355 nm, pulse duration of 10 ps and inter-pulse delay of 0.1 ns were combined to induce intra-volume modifications (directional cracks) in sapphire for wafer separation. The photon energy of both beams is well below the band gap, and various channels of the multi-photon excitation were involved in the process. Significant enhancement in the modification area was experimentally observed when intensities of focused infrared and ultraviolet beams were within narrow ranges. We discuss the resonant laser–sapphire interaction mechanisms, leading to up to four times higher excitation of the material involving multiple photons and energetic levels of intrinsic defects in the band-gap. The energy level schemes of colour centres involved in two-step multi-photon absorption in sapphire under intensive laser irradiation have been prepared.

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Ultrafast Breakdown of dielectrics: Energy absorption mechanisms investigated by double pulse experiments

Cited by 22 publications

References 12 publications

Near-THz bursts of pulses – Governing surface ablation mechanisms for laser material processing

Near-THz bursts of pulses – Governing surface ablation mechanisms for laser material processing

Laser-induced periodic surface structures on titanium upon single- and two-color femtosecond double-pulse irradiation

The behaviour of sapphire under intense two-colour excitation by picosecond laser

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