FEM based simulation of the pulsed laser ablation process in nanosecond fields

Lim, Hee Seung; Yoo, Jeonghoon

doi:10.1007/s12206-011-0511-z

Cited by 41 publications

(18 citation statements)

References 9 publications

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“…The temperature distribution within the hydrogel matrix is governed by the heat equation. Hence, the thermal energy U in the system is described in the numerical model as

Q = \frac{\partial U}{\partial t} - D \nabla^{2} U

where Q is the amount of heat source transferred from the laser and absorbed in the hydrogel matrix and D represents thermal diffusivity of the hydrogel matrix which equals to k / ρC p ; where ρC p is the volumetric heat capacity and k is the thermal conductivity of hydrogel matrix. The local heat Q can be extracted with the absorbed energy from the laser beam.…”

Section: Resultsmentioning

confidence: 99%

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Microfluidic Contact Lenses

Jiang

Montelongo

Butt

et al. 2018

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Contact lens is a ubiquitous technology used for vision correction and cosmetics. Sensing in contact lenses has emerged as a potential platform for minimally invasive point-of-care diagnostics. Here, a microlithography method is developed to fabricate microconcavities and microchannels in a hydrogel-based contact lens via a combination of laser patterning and embedded templating. Optical microlithography parameters influencing the formation of microconcavities including ablation power (4.3 W) and beam speed (50 mm s ) are optimized to control the microconcavity depth (100 µm) and diameter (1.5 mm). The fiber templating method allows the production of microchannels having a diameter range of 100-150 µm. Leak-proof microchannel and microconcavity connections in contact lenses are validated through flow testing of artificial tear containing fluorescent microbeads (Ø = 1-2 µm). The microconcavities of contact lenses are functionalized with multiplexed fluorophores (2 µL) to demonstrate optical excitation and emission capability within the visible spectrum. The fabricated microfluidic contact lenses may have applications in ophthalmic monitoring of metabolic disorders at point-of-care settings and controlled drug release for therapeutics.

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“…The temperature distribution within the hydrogel matrix is governed by the heat equation. Hence, the thermal energy U in the system is described in the numerical model as

Q = \frac{\partial U}{\partial t} - D \nabla^{2} U

Section: Resultsmentioning

confidence: 99%

“…The temperature distribution within the hydrogel matrix is governed by the heat equation. Hence, the thermal energy U in the system is described in the numerical model as [25] 2…”

Section: Resultsmentioning

confidence: 99%

Microfluidic Contact Lenses

Jiang

Montelongo

Butt

et al. 2018

Small

View full text Add to dashboard Cite

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“…A 3D model has been developed to predict the temperature distribution and material removal during nanosecond laser ablation of various materials. 34 Therefore, an analogous approach was adopted in this study for a continuous CO 2 laser. The Finite Element Analysis (FEA) method was utilized to simulate the model.…”

Section: Fem Simulations Of Laser Ablation On Glass Substratesmentioning

confidence: 99%

Laser inscription of pseudorandom structures for microphotonic diffuser applications

et al. 2018

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Optical diffusers provide a solution for a variety of applications requiring a Gaussian intensity distribution including imaging systems, biomedical optics, and aerospace. Advances in laser ablation processes have allowed the rapid production of efficient optical diffusers. Here, we demonstrate a novel technique to fabricate high-quality glass optical diffusers with cost-efficiency using a continuous CO2 laser. Surface relief pseudorandom microstructures were patterned on both sides of the glass substrates. A numerical simulation of the temperature distribution showed that the CO2 laser drills a 137 μm hole in the glass for every 2 ms of processing time. FFT simulation was utilized to design predictable optical diffusers. The pseudorandom microstructures were characterized by optical microscopy, Raman spectroscopy, and angle-resolved spectroscopy to assess their chemical properties, optical scattering, transmittance, and polarization response. Increasing laser exposure and the number of diffusing surfaces enhanced the diffusion and homogenized the incident light. The recorded speckle pattern showed high contrast with sharp bright spot free diffusion in the far field view range (250 mm). A model of glass surface peeling was also developed to prevent its occurrence during the fabrication process. The demonstrated method provides an economical approach in fabricating optical glass diffusers in a controlled and predictable manner. The produced optical diffusers have application in fibre optics, LED systems, and spotlights.

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“…Recently, models based on FEM dealing with laser ablation have been published [97][98][99][100][101][102] and their main concepts are further discussed in Sec. 6 of this paper.…”

Section: Dynamic Response Of Matter In the Ablation Regimeplasma Formmentioning

confidence: 99%

A Review of Simulation Methods of Laser Matter Interactions Focused on Nanosecond Laser Pulsed Systems

Kaselouris

Nikolos

Orphanos

et al. 2013

J. Multiscale Modelling

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A review study of the developments in the field of pulsed laser-solid interaction simulation methods, for moderate laser energies, is presented. The paper is focused on the methods that numerically simulate the interactions of pulsed ns-laser with solid metal targets. Three main regimes for pulsed laser excitation, are well established, namely, the thermoelastic, melting and plasma regimes. The modelling and simulation techniques that may numerically describe these three regimes and the occurring dynamic matter responses are reviewed. Modelling efforts concerning various fields of applications of lasers are briefly discussed.

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FEM based simulation of the pulsed laser ablation process in nanosecond fields

Cited by 41 publications

References 9 publications

Microfluidic Contact Lenses

Microfluidic Contact Lenses

Laser inscription of pseudorandom structures for microphotonic diffuser applications

A Review of Simulation Methods of Laser Matter Interactions Focused on Nanosecond Laser Pulsed Systems

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