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Laser Machining of Metals
Published in V. K. Jain, Advanced Machining Science, 2023
Focused laser beams can be used to create marks on any metal surface. Laser marking broadly refers to the technique of generating marks on a surface through focused laser irradiation. Marks are produced either due to material ablation or coloration due to chemical change (such as oxide formation) upon laser irradiation. The ejected material is blown off or removed using vacuum suction. In general, marks could be just on the surface or can contain deeper grooves. Laser engraving is a term that is specifically used when the mark needs to penetrate to a certain depth (typically 200–300 µm). This is done by scanning the laser multiple times until the desired depth of the groove (or mark) is achieved by ablation. Marks produced by laser engraving have greater permanency and can withstand harsh conditions. They remain visible even after some coatings are applied. In comparison, marks produced by the coloration of a surface due to chemical changes may disappear upon surface damage (such as scratches) or after applying coatings.
Preclinical Molecular Imaging Systems
Published in Michael Ljungberg, Handbook of Nuclear Medicine and Molecular Imaging for Physicists, 2022
The use of subsurface laser engraving (SSLE) has also been applied to create an array of scintillator elements without the need of mechanical cutting. When using SSLE, the detector elements are created by laser “cutting” where the optical separation is created by cracks in the scintillation crystal [25, 26]. Due to the dispersion of the laser beam, this method is limited to crystal depths of less than 10 mm. Furthermore, the elements are not completely optically isolated from each other and cross-talk compromises detector identification, especially for elements smaller than 2 mm in width [26].
Bioinspired Nano-Formulations
Published in Yasser Shahzad, Syed A.A. Rizvi, Abid Mehmood Yousaf, Talib Hussain, Drug Delivery Using Nanomaterials, 2022
Jahanzeb Mudassir, Muhammad Sohail Arshad
Top-down approach involved the reduction of particle size within a biological system. The desired geometry is obtained through techniques such as laser engraving, etching, or deconstructive process. Furthermore, the top-down approaches are used to synthesize mono-disperse nanoparticles with controllable size. This approach is classified into physical, chemical, and biological methods.
Towards sustainable production for transition to additive manufacturing: a case study in the manufacturing industry
Published in International Journal of Production Research, 2023
Neslihan Top, Ismail Sahin, Sachin Kumar Mangla, Muruvvet Deniz Sezer, Yigit Kazancoglu
Laser engraving is the etching of the surface of an object with a laser beam. Laser engravers for processing wood, metal, plastic, leather and glass surfaces can be of different sizes and functions. Besides, these machines are advantageous due to their light and portable features. Within the scope of the study, a commercial Desktop LEM produced by conventional methods was examined. The case of the device is 21 × 21 × 23 cm and consists of eight parts. These parts are the plates (six parts) forming the body of the machine and mounting bases (two parts) to which the electronic equipment is attached. Apart from these, fasteners (screws), electronic equipment, motors and the table are components that make up a typical LEM. The LEM body is made of aluminium with mounting bases made of stainless steel.