Origin of the damage ring pattern in fused silica induced by multiple longitudinal modes laser pulses

Chambonneau, Maxime; Díaz, Roberto Ruiz; Grua, P.; Rullier, Jean-Luc; Duchateau, Guillaume; Natoli, Jean-Yves; Lamaignère, Laurent

doi:10.1063/1.4861748

Cited by 41 publications

(19 citation statements)

References 18 publications

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“…A Nose-Hoover thermostat/barostat was used in the NVT and NPT simulations to control temperature and pressure, with coupling constants of 50 fs and 500 fs, respectively. The resulting density of the system is 2.19 g/cm 3 , in good agreement with the experimental value of 2.20 g/cm 3 . FIG.…”

confidence: 75%

“…Despite extensive studies of radiation effects on fused silica, details of the associated material response are still not fully understood. 3,4 It is believed that low fluence laser can induce irreversible structural changes without destroying material integrity. 5 In this work, molecular dynamics (MD) simulations were performed to present evidence that silica structure in both short and medium ranges is directly modified by UV-induced defects.…”

confidence: 99%

“…[12][13][14][15] The amorphous structure of fused silica was prepared by the conventional simulated melt and quench process in steps of 0.5 fs. The initial configuration contains 3000 atoms (1000 SiO 2 units) that were randomly positioned in a periodic cubic cell with a density of 2.2 g/cm 3 . After being fully melt at 4000 K, the liquid was gradually quenched to 300 K at 5 K/ps in an NVT ensemble.…”

confidence: 99%

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UV-induced modification of fused silica: Insights from ReaxFF-based molecular dynamics simulations

Tian

et al. 2016

AIP Advances

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Atomic structural modification and defect processes of fused silica resulting from UV-laser irradiation are studied by a combination of molecular dynamics (MD) simulations and the Reactive Force Field (ReaxFF). Bond state transitions by laser excitation are modeled as the result of localized recoils during energy deposition. Computations of pair distribution functions and bond angle distributions of the irradiated structure reveal that fused silica undergoes significant changes in terms of Si-O, Si-Si pair distances and Si-O-Si bond angles, which are attributed to the formation of silicon and oxygen coordination defects. It is found that nonbridging oxygen is responsible for the decreased Si-O bond length, while laser-induced five-coordinated silicon leads to small Si-O-Si bond angles in 2-membered rings.

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confidence: 75%

confidence: 99%

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UV-induced modification of fused silica: Insights from ReaxFF-based molecular dynamics simulations

Tian

et al. 2016

AIP Advances

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“…However, the probability of growth in this configuration needs to be investigated. Other recent studies show that both LID initiation [22,23] and growth [24] phenomena originate from a plasma formation and expansion in the center and also at the periphery of the damage sites. The simultaneous irradiations of silica at two different wavelengths could significantly impact the dynamics of the produced plasma.…”

Section: Introductionmentioning

confidence: 93%

Investigations on laser damage growth in fused silica with simultaneous wavelength irradiation

et al. 2015

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The laser-induced damage growth phenomenon is experimentally studied for damage sites on the exit surface of fused silica. The sites are irradiated by nanosecond laser pulses at 1064 and 355 nm separately and also simultaneously. The results in the single wavelength configurations are expressed in terms of the probability of growth and growth coefficient. For growing sites, a fluence correction expression is proposed in order to take into account the millimetric Gaussian profile of the beams. The use of this expression is necessary to obtain results that are consistent with the ones obtained in the existing literature with large homogeneous beams. In the multiple wavelengths configuration, the results are expressed as a function of the laser fluences at each wavelength and are found to be closely related to the parameters determined in the single wavelength experiments. A coupling between the two wavelengths is quantified, and could originate from the formation and the expansion of a plasma produced both in the center and at the periphery of the damage sites.

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“…In the experiments reported here, we observe damage only at the exit surface of fused silica. We analyze damage morphology, which includes a systematic ring pattern in the MLM regime at 1ω [10]. This pattern is not seen in the SLM case.…”

Section: Introductionmentioning

confidence: 97%

Laser-induced damage morphology in fused silica at 1064 nm in the nanosecond regime

et al. 2014

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The morphology of laser-induced damage sites at the exit surface of fused silica is tightly correlated to the mode composition of the nanosecond laser pulses at 1064 nm. In the single longitudinal mode (SLM) configuration, a molten and fractured central zone is surrounded by a funnel-shaped surface modification. Ring patterns surround the damage sites when these are initiated by multiple longitudinal modes (MLM) laser pulses. In this last mode configuration, the pulses temporal profiles as well as the damage ring patterns differ from pulse to pulse. The appearance chronology of the rings is found to be closely related to the temporal shape of the laser pulses. This supports that the damage morphology originates from the coupling of a laser-supported detonation wave propagating in air with an ablation mechanism in silica. In our experiments, the propagation speed of the detonation wave reaches about 20 km/s and scales as the cube root of the laser intensity, in good agreement with theory.

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Origin of the damage ring pattern in fused silica induced by multiple longitudinal modes laser pulses

Cited by 41 publications

References 18 publications

UV-induced modification of fused silica: Insights from ReaxFF-based molecular dynamics simulations

UV-induced modification of fused silica: Insights from ReaxFF-based molecular dynamics simulations

Investigations on laser damage growth in fused silica with simultaneous wavelength irradiation

Laser-induced damage morphology in fused silica at 1064 nm in the nanosecond regime

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