Temperature field simulation of chalcogenide glass ablation by nanosecond pulsed laser-based on pump–probe technology

Chen, Mengxia; Qi, Dongfeng; Deng, Haotian; Liu, Yuhan; Shen, Xiang

doi:10.1016/j.optlastec.2021.107771

Cited by 4 publications

(3 citation statements)

References 51 publications

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“…d o−a (focused laser beam diameter) and E th−sa (minimum laser energy to ablate the surface) were calculated using Eq. 10 [9,34,41,56,73] th−sa decreases with the reduction of the surface roughness as can be observed in Fig. 6.c.…”

Section: Topographysupporting

confidence: 58%

“…Gas material then presses on the molten material that when the pressure is sufficiently high, the bubble can explode. Explosion ejects the liquid material outside of the laser treated area [47,48,[53][54][55][56][57][58]. The first dimple type was furthermore found at lower E p than the second dimple kind as the phase explosion requires higher energy fluence to be produced than surface vaporisation for the nanosecond pulsed lasers [47].…”

Section: Surface Morphologymentioning

confidence: 99%

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Effect of Surface Roughness on the Surface Texturing of 316 l Stainless Steel by Nanosecond Pulsed Laser

Al-Mahdy

Kotadia

Sharp

et al. 2022

Lasers Manuf. Mater. Process.

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Stainless steel 316L is an austenitic alloy that is widely used in varying industries due to its outstanding corrosion resistance, high strength, and ductility properties. However, the wear and friction resistance properties are low. Laser surface texturing can improve the wear and friction resistance of the material via the functionalisation of the surface. The laser surface texturing efficiency and the texture quality are defined by the material’s surface properties and laser parameters. The surface roughness is an important material property having an effect on laser surface texturing. This paper reports on a study of the material’s surface roughness influence on the texturing of 316L stainless steel with 1064 nm nanosecond pulsed laser. Single pulse shots were employed to avoid the topographic influence of the previous laser shots. The surface shape and the topography of the textures were assessed using optical microscopy and profilometry. It was observed that the textures produced were dimples of U-type and sombrero-like type geometries depending on surface roughness and pulse energy. The overall quality of the texture shape was better for smoother surfaces. The energy fluence necessary to generate textures is lower on surfaces of lower roughness than surfaces with high roughness. The surface at 24 nm of average roughness is the best surface for creating deep textures. The ablation mechanisms associated with high pulse energy, including plasma shielding, are produced at lower pulse energies for the 100 nm roughness, compared with other roughness samples.

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Section: Topographysupporting

confidence: 58%

Section: Surface Morphologymentioning

confidence: 99%

Effect of Surface Roughness on the Surface Texturing of 316 l Stainless Steel by Nanosecond Pulsed Laser

Al-Mahdy

Kotadia

Sharp

et al. 2022

Lasers Manuf. Mater. Process.

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show abstract

“…Therefore, the ns laser can be considered the only heating source during the interaction between the ns laser and the GeSn film. However, the heat transfer and thermal diffusion processes of electron-lattice coupling and lattice-lattice coupling cause the surface temperature of the film to decrease slowly [48]. Therefore, the slower non-equilibrium transition of surface temperature during ns laser annealing allows the surface of the film to be heated for a long time.…”

Section: Resultsmentioning

confidence: 99%

Effect of Laser Pulse Width and Intensity Distribution on the Crystallographic Characteristics of GeSn Film

Wang

Zhou

et al. 2023

Coatings

Self Cite

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Germanium-tin (GeSn) alloy is considered a promising candidate for a Si-based short-wavelength infrared range (SWIR) detector and laser source due to its excellent carrier mobility and bandgap tunability. Pulsed laser annealing (PLA) is one of the preeminent methods for preparing GeSn crystal films with high Sn content. However, current reports have not systematically investigated the effect of different pulse-width lasers on the crystalline quality of GeSn films. In addition, the intensity of the spot follows the gaussian distribution. As a result, various regions would have different crystalline properties. Therefore, in this study, we first provide the Raman spectra of several feature regions in the ablation state for single spot processing with various pulse-width lasers (continuous-wave, nanosecond, femtosecond). Furthermore, the impact of laser pulse width on the crystallization characteristics of GeSn film is explored for different single-spot processing states, particularly the Sn content incorporated into GeSn crystals. The transient heating time of the film surface and the faster non-equilibrium transition of the surface temperature inhibit the segregation of the Sn component. By comparing the Raman spectra of the pulsed laser, the continuous-wave laser shows the most acute Sn segregation phenomenon, with the lowest Sn content of approximately 2%. However, the femtosecond laser both ensures crystallization of the film and effective suppression of Sn expulsion from the lattices, and the content of Sn is 8.07%, which is similar to the origin of GeSn film.

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Numerical analysis and experimental research on the removal of CuO particles from monocrystalline silicon surfaces by picosecond laser

Mei,

Lin,

Yan

et al. 2024

Materials Science in Semiconductor Processing

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Temperature field simulation of chalcogenide glass ablation by nanosecond pulsed laser-based on pump–probe technology

Cited by 4 publications

References 51 publications

Effect of Surface Roughness on the Surface Texturing of 316 l Stainless Steel by Nanosecond Pulsed Laser

Effect of Surface Roughness on the Surface Texturing of 316 l Stainless Steel by Nanosecond Pulsed Laser

Effect of Laser Pulse Width and Intensity Distribution on the Crystallographic Characteristics of GeSn Film

Numerical analysis and experimental research on the removal of CuO particles from monocrystalline silicon surfaces by picosecond laser

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