Simulation and experimental investigations of thermal degradation of polystyrene under femtosecond laser ablation

Huang, Yao-Hui; Wu, Mengnan; Song, Chengwei; Zhang, Jun Jie; Sun, Tao; Jiang, Lan

doi:10.1007/s00339-018-2215-z

Cited by 9 publications

(4 citation statements)

References 20 publications

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“…Moreover, at an energy level of 20 J/cm 2 , cluster sizes tend to predominantly remain below 5. This implies that heightened laser energy densities yield smaller and more fragmented clusters, or even individual contaminant particles …”

Section: Resultsmentioning

confidence: 99%

“…This implies that heightened laser energy densities yield smaller and more fragmented clusters, or even individual contaminant particles. 35 The mass density assumes a pivotal role in delineating the ablation profundity and fusion profundity of the foundational material. It serves as an indicator of the phase transition and alterations in density within the region affected by the laser.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

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Investigation of the Multimechanism Laser Cleaning Dynamics for Rough Fused Silica Surfaces with Organic Contaminants: A Computational Simulation and Atomic Analysis

Wang,

Bai,

et al. 2023

Langmuir

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The detrimental impact of organic contaminants on optical components poses a significant obstacle to high-energy laser systems. However, irregularities or defects on the surface of optical components during manufacturing can affect the process of organic contaminant removal. Thus, a comprehensive understanding of the intricate interplay among surface roughness, contaminant absorption, and ablation is essential to effectively address the challenges of laser-induced damage. In this study, a molecular dynamics approach was employed to investigate the interaction between laser-fused silica and contaminants and to analyze the influence of surface roughness on the removal of contaminants from fused silica. Research findings demonstrate that during laser irradiation, organic contaminants on the surface of mechanical components diffuse into the optical elements. As the laser flux increases, the contaminants gradually decompose into smaller molecular clusters. Additionally, the phenomenon of contaminant ablation is observed to consist of two distinct phases: the “Thermal expansion phase” and the “Thermal ablation phase.” The study examines the impact of substrate roughness on the contaminant removal in these two phases. It is found that a higher surface roughness leads to stronger thermal expansion and vaporization of contaminants. With increasing roughness of the fused silica substrate, the corresponding van der Waals energy and pressure decrease under the same laser fluence, making the removal of contaminants easier. These results provide valuable insights into the interaction between laser irradiation and organic contaminants.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Materials and Methodsmentioning

confidence: 99%

Investigation of the Multimechanism Laser Cleaning Dynamics for Rough Fused Silica Surfaces with Organic Contaminants: A Computational Simulation and Atomic Analysis

Wang,

Bai,

et al. 2023

Langmuir

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“…In past decades, great improvement has been achieved in the field of femtosecond laser processing of solids, which has been an effective method to prepare new kinds of materials. Femtosecond laser can be used to process various kinds of materials, including metals 1 – 4 , semiconductors 5 – 8 , and dielectrics 9 – 11 . Femtosecond laser processing can achieve micro-structures 12 – 14 and doping 15 – 17 on solid surfaces.…”

Section: Introductionmentioning

confidence: 99%

Spatial distribution characteristics of plumes induced by femtosecond laser ablation of silicon in vacuum

Chen¹,

Ning²,

Zhang³

2023

Sci Rep

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The spatial distribution characteristics of plumes induced by femtosecond laser ablation of silicon in vacuum are studied by using spectroscopy. The plume spatial distribution clearly shows two zones with different characteristics. The center of the first zone is at a distance of approximately 0.5 mm from the target. Silicon ionic radiation, recombination radiation, and bremsstrahlung mainly occur in this zone, causing an exponential decay with a decay constant of approximately 0.151–0.163 mm. The second zone with a greater area, whose center is at a distance of approximately 1.5 mm from the target, follows the first zone. In this zone, the radiation from silicon atoms and electron-atom collisions dominates, leading to an allometric decay with an allometric exponent of approximately − 1.475 to − 1.376. In the second zone, the electron density spatial distribution is approximately arrowhead-shaped, which is potentially induced by collisions between ambient molecules and the particles in front of the plume. These results indicate that both the recombination effect and expansion effect play important roles and compete with each other in plumes. The recombination effect is dominant near the silicon surface, causing exponential decay. As the distance increases, the electron density decreases exponentially by recombination, causing a more intense expansion effect.

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“…12) Otherwise, PTFE can be used in a large temperature range of −190 °C ∼ 260 °C, due to its excellent chemical and thermal stability, which makes PTFE suitable to be ablation-resistant propellants. 13,14) By using the numerical method to simulate the process of laser irradiating PTFE, the relevant physics of propellant ablation, plume expansion and components evolution needs to be implemented. Oddly enough though, there does not exist in the literature a model that compute the PTFE plume expansion and components evolution.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation on plume expansion, components evolution and ionization of polytetrafluoroethylene (PTFE) irradiated by nanosecond laser

Zhang¹,

Wu²,

Ou³

et al. 2020

Jpn. J. Appl. Phys.

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To investigate the plume expansion, components evolution and ionization in the laser ablation pulsed plasma thruster, which is difficult to obtain from experiments, the non-Fourier heat conduction model, fluid dynamics model and thermochemical model are established. The non-Fourier heat conduction model is established to calculate the propellant ablation, taking into account temperature dependent material properties, phase transition, depolymerization of polytetrafluoroethylene propellant, the reflection of the laser beam at the surface of the propellant, and non-Fourier effect. The fluid dynamics model is established to calculate the plume expansion, taking into account plume absorption and shielding. The thermochemical model is established to calculate the components evolution and ionization, taking into account nine chemical and ionization reactions with 12 components. By coupling the three models, the thermochemical characteristics, plume expansion and ionization of polytetrafluoroethylene irradiated by a nanosecond laser are numercially calculated.

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Simulation and experimental investigations of thermal degradation of polystyrene under femtosecond laser ablation

Cited by 9 publications

References 20 publications

Investigation of the Multimechanism Laser Cleaning Dynamics for Rough Fused Silica Surfaces with Organic Contaminants: A Computational Simulation and Atomic Analysis

Investigation of the Multimechanism Laser Cleaning Dynamics for Rough Fused Silica Surfaces with Organic Contaminants: A Computational Simulation and Atomic Analysis

Spatial distribution characteristics of plumes induced by femtosecond laser ablation of silicon in vacuum

Numerical investigation on plume expansion, components evolution and ionization of polytetrafluoroethylene (PTFE) irradiated by nanosecond laser

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