Nanoporous silicon optical waveguides, which serve as the basic foundation for porous silicon based biochemical sensors, have been fabricated by electrochemical etching and laser local oxidation. By optimizing the porous silicon layers, laser writing power and speed, acceptable optical losses have been achieved. Loss mechanisms include scattering, intrinsic absorption, coupling loss at the fibe...

Laser scanning of fiber angles has shown to be a powerful tool to establish bending MOE profiles along boards. This study aims at investigating the accuracy of the MOE variation determined on basis of fiber angles obtained from laser scanning. Material employed was a board of Norway spruce of dimension 50×150×3900 mm. Firstly fiber angles on four surfaces were identified using a WoodEye scanner...

We propose a method to automatically design bending-active structures, made of wood, whose silhouettes at equilibrium match desired target curves. Our approach is based on the use parametric pattern that regularly laser-cut structure and allows us locally modulate bending stiffness material. To make problem tractable, we rely two-scale where first compute mapping between average mechanical prop...

We present a novel approach to monitoring the surface deformations during various types of laser processing, e.g., engraving, marking, cutting, bending, and welding. The measuring system is based on a laser triangulation principle, where the laser projector generates multiple lines simultaneously. This enables us to measure the shape of the surface with a high sampling rate (80 Hz with our came...

Tunable multi-wavelength polymer lasers based on two-dimensional distributed feedback structures are fabricated on a transparent flexible substrate using interference ablation. A scalene triangular lattice structure was designed to support stable tri-wavelength lasing emission and was achieved through multiple exposure processes. Three wavelengths were controlled by three periods of the compoun...

This study presents a finite element method (FEM) based three-dimensional laser forming process design methodology for thin plates to determine the laser scanning paths and heating conditions. The strain fields were first calculated via FEM. The laser scanning paths were chosen perpendicular to the averaged principal minimum strain direction. The ratios of in-plane and bending strain were calcu...

Laser beam forming has emerged as a viable technique to form sheet metal by thermal residual stresses. Although it has been a subject of many studies, its full industrial application is not yet established. This article aims to complement the existing research in the area of laser forming in order to gain a better understanding of the process. A numerical investigation of laser forming of stain...