Comparison of numerical simulations with experiment on generation of craters in silica by a laser

Bercegol, Herve; Bonneau, Florian; Bouchut, Philippe; Combis, P.; Gallais, Laurent; Lamaignère, Laurent; Natoli, Jean-Yves; Rullier, Jean-Luc; Vierne, J.

doi:10.1117/12.472406

Cited by 11 publications

(12 citation statements)

References 14 publications

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“…In Fig. 39 results of similar crater-formation studies 28 for particles of the same 600-nm size, lodged at a deeper, 5-m depth, also show good agreement between theory and experiment for crater size and depth. Nevertheless, experimentally measured and predicted crater profiles have distinct differences; particularly, the doublecone, experimental shape is not present in the simulations.…”

Section: Numerical Modeling Of the Damage Process In Model Thin Film supporting

confidence: 74%

Using gold nanoparticles as artificial defects in thin films: What have we learned about laser-induced damage driven by localized absorbers?

Papernov

Schmid

2006

SPIE Proceedings

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There is general agreement that localized absorbing defects are a major factor affecting thin-film performance, and laserinduced damage in films designed for UV, nanosecond-scale, pulsed-laser applications is driven by nanoscale absorbers. Low number densities and size (few nanometer), however, prevent any characterization of these defects and, consequently, deterministic film improvement. This situation also hampers further development of localized defectdriven damage theory, since initial conditions for modeling remain uncertain. Recently, a new approach for studying laser interaction with thin-film nanoscale defects was implemented in which well-characterized, isolated artificial absorbing defects (gold nanoparticles) were introduced inside the thin film. This work is a review in which we discuss main findings from experiments with gold nanoparticles, such as delocalization of absorption during the laser pulse, importance of the defect boundary conditions (contact with the matrix), and competition of pure thermal and stressdriven mechanisms of damage-crater formation. These experimental results will be compared with theoretical results of damage-crater formation in such model thin films using both phenomenological modeling and detailed calculations of the kinetics of the damage process. An outlook on future thin-film-damage studies using model systems with artificial defects is also presented.

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Section: Numerical Modeling Of the Damage Process In Model Thin Film supporting

confidence: 74%

Using gold nanoparticles as artificial defects in thin films: What have we learned about laser-induced damage driven by localized absorbers?

Papernov

Schmid

2006

SPIE Proceedings

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“…This result and also the considerations on defect density in the UV discussed in sect. 4.1 indicate that differences in beam profiles can only be taken into account when the defect density is low enough that the beam size not necessarily always covers damage contributing defects. One noticeable result from these investigations was that a Lithosil substrate with a different polish showed a significantly higher damage …”

Section: Results Of Top-hat and Gaussian Beam Profile Test Benchesmentioning

confidence: 98%

“…[2][3][4][5] An impurity localized in the coating or bulk material will heat up incomparably faster than the surrounding region during the duration of the irradiating laser pulse. This leads to a breakdown of the heated material and damage of the optical component.…”

Section: Spot Size Dependence Of the Damage Thresholdmentioning

confidence: 99%

Comparison of Gaussian and top-hat beam profiles in LIDT testing

et al. 2007

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The ISO 11254 standard for LIDT tests suggests two possible spatial beam profiles for damage testing. Accordingly, an equal set of samples was tested with a Gaussian TEM 00 as well as with a top-hat beam profile at different beam diameters. It was found that for the investigated HfO 2 /SiO 2 high reflectors there was no threshold dependence on the beam diameter at 355nm. The damage threshold values measured with the Gaussian and the top-hat beam were in good correlation.

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“…As for the transient behaviors when the black shadow initially appears during the laser damage processes, we can infer that there would be shallow vignetting on the trigger point of the laser damage according to the predamage sites with the laser damage precursor being transformed. 28 When the lateral crack is irradiated with the strong laser beam, the hotspot of laser energy is generated by light intensification. A large amount of energy deposition near the surface defects would rapidly increase the local temperature.…”

Section: Resultsmentioning

confidence: 99%

Model Development for Nanosecond Laser-Induced Damage Caused by Manufacturing-Induced Defects on Potassium Dihydrogen Phosphate Crystals

et al. 2020

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Nanosecond laser-induced damage on (potassium dihydrogen phosphate) KDP crystals is a complex process, which involves coupled actions of multi-physics fields. However, the mechanisms governing the laser damage behaviors have not been fully understood and there have been no available models to accurately describe this complex process. In this work, based on the theories of electromagnetic, thermodynamic, and hydrodynamic fields, a coupled multi-physics model is developed to describe the transient behavior of laser-supported energy deposition and diffusion accompanied by the surface defect (e.g., surface cracks)-initiated laser damage process. It is found that the light intensification caused by the defects near the crystal surface plays a significant role in triggering the laser-induced damage, and a large amount of energy is quickly deposited via the light intensity-activated nonlinear excitation. Using the developed model, the maximum temperature of the crystal material irradiated by a 3 ns pulse laser is calculated, which agrees well with previously reported experimental results. Furthermore, the modeling results suggest that physical processes such as material melting, boiling, and flowing have effects on the evolution of the laser damage process. In addition, the experimentally measured morphology of laser damage sites exhibits damage features of boiling cores, molten regions, and fracture zones, which are direct evidence of bowl-shaped high-temperature expansion predicted by the model. These results well validate that the proposed coupled multi-physics model is competent to describe the dynamic behaviors of laser damage, which can serve as a powerful tool to understand the general mechanisms of laser interactions with KDP optical crystals in the presence of different defects.

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Comparison of numerical simulations with experiment on generation of craters in silica by a laser

Cited by 11 publications

References 14 publications

Using gold nanoparticles as artificial defects in thin films: What have we learned about laser-induced damage driven by localized absorbers?

Using gold nanoparticles as artificial defects in thin films: What have we learned about laser-induced damage driven by localized absorbers?

Comparison of Gaussian and top-hat beam profiles in LIDT testing

Model Development for Nanosecond Laser-Induced Damage Caused by Manufacturing-Induced Defects on Potassium Dihydrogen Phosphate Crystals

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