Articles techniques et présentations

Quantum Dots (QDs) laser is expected to have a low threshold current density and high thermal stability. We propose the QDs laser with the half-etched mesa distributed feedback (HEM DFB) structure. We accurately calculated the coupling coefficient in a HEM waveguide using the finite ... En savoir plus

For a better understanding of phenomena associated to the appearance of defects in laser welding, a heat and fluid flow model is developed. This study is focused on the modeling of a static laser shot on a sample of steel. This 2D axialsymmetric configuration is used to study phenomena ... En savoir plus

Arc welding is a widely used process in heavy industry for the assembly of metallic components. To ensure high-quality welds, it is essential to understand both the welding process and the complex interactions within the melt pool. Numerical simulation is employed as a predictive tool to ... En savoir plus

Laser interstitial thermotherapy (LITT) is a cancer treatment technique in which laser fibers are introduced inside the tumor. While it destroys deep tumors, the LITT procedure allows minimizing the impact on adjacent healthy structures. One of the effective methods to perform treatment ... En savoir plus

A time-dependent COMSOL Multiphysics model of an additive manufacture process, which uses powder consolidation by laser heating was developed, providing a platform to better understanding the manufacture process & provide a tool to reduce resulting distortion & optimization of an ... En savoir plus

This study presents a numerical investigation of optical butt-coupling between Vertical-Cavity Surface-Emitting Lasers (VCSELs) operating at 850 nm and Standard Single-Mode Fiber (SSMF), a widely adopted configuration in cost-effective, high-speed optical interconnects, especially in ... En savoir plus

Accurate, real-time measurement of arterial oxygen partial pressure (PaO₂) is essential for managing respiratory diseases and critical care conditions. Traditional arterial blood sampling for PaO₂ is invasive, painful, and provides intermittent snapshots rather than continuous ... En savoir plus

Large underground mines (LUMs), which constitute over 60% of metal and nonmetal mining operations in the United States, are critical to national infrastructure and materials supply (Bhattacharyya et al., 2023; Gendrue et al., 2021). These mines are characterized by vast entries exceeding ... En savoir plus

Neste trabalho utilizamos o software COMSOL Multiphysics® para resolver a equação de difusão de calor induzida por laser. Está equação é a base de técnicas fototérmicas em especial a técnica de Lente Térmica. Além de resolver a equação de difusão sem o uso das aproximações de amostra ... En savoir plus

This paper presents a 3D numerical model to predict the whole process of coaxial powder flow, including the particle stream flow in and below the nozzle and also the laser-particle interaction process. The Particle Tracing Module of COMSOL Multiphysics is used to solve the coupled ... En savoir plus