Fiber Lasers in Material Processing

Abstract

The economic aspects of laser usage in manufacturing that form important criteria in the choice of a suitable laser system for thick-section metal cutting include: high processing speeds, high processing depths, high cut edge quality, and high wall-pug efficiency of the laser system. Consequently, the performance of the high brightness ytterbium fiber laser system in thick-section metal cutting is evaluated based on the maximum achievable cutting speeds, maximum cutting depths possible, and cut edge quality attainable. The maximum processing speeds, maximum processing depths, and resulting cut edge quality are governed by a number of parameters related to the laser system, workpiece specification, and the cutting process. The effects of the processing parameters in the cutting of thicksection stainless steel and mild steel and medium-section aluminium have been reported; optimization of the processing parameters for enhancement of the cut edge quality has been discussed.

Single-Frequency Continuous-Wave Self-Sweeping Fiber Laser Based on Separated Gain and Absorption Dynamics Gratings

“…Fiber lasers, due to their compactness, high power, high quality of output radiation and a variety of generation regimes, compete with other types of lasers and have a high practical potential for application in various areas of human life. For example, fiber lasers are used in telecommunication [1], material processing [2] and sensing [3][4][5]. A special place among fiber lasers belongs to lasers with tunable wavelength generation (the socalled tunable lasers).…”

Modificação superficial a laser para obtenção de gradientes de dureza e módulo de elasticidade em titânio

“…outra parte é refletida. Os dois mecanismos de absorção mais importantes são a absorção Fresnel e absorção por plasma ou efeito Bremsstrahlung inverso(WANDERA, 2016).Absorção Fresnel acontece durante a interação direta do feixe do laser com a superfície do material. Os fótons da radiação incidente são absorvidos pelos elétrons livres do metal, o que resulta no aumento da vibração da rede dos átomos do metal e, consequentemente, aumento de sua temperatura.…”