Thermal Investigation of Interaction between High-power CW-laser Radiation and a Water-jet

作     者：Christian Brecher Henning Janssen Markus Eckert Florian Schmidt 

作者机构：Fraunhofer Institute for Production Technology IPT Steinbachstraße 17 Aachen 52074 Germany Laboratory for Machine Tools and Production Engineering WZL of RWTH Aachen University Steinbachstraße 19 Aachen 52074 Germany 

出 版 物：《Physics Procedia》 

年 卷 期：2016年第83卷

页      面：317-327页

学科分类：07[理学] 

主　　题：Laser-Water-Jet High-Power High DOF Beam Guiding 

摘      要：The technology of a water guided laser beam has been industrially established for micro machining. Pulsed laser radiation is guided via a water jet (diameter: 25-250 μm) using total internal reflection. Due to the cylindrical jet shape the depth of field increases to above 50 mm, enabling parallel kerfs compared to conventional laser systems. However higher material thicknesses and macro geometries cannot be machined economically viable due to low average laser powers. Fraunhofer IPT has successfully combined a high-power continuous-wave (CW) fiber laser (6 kW) and water jet technology. The main challenge of guiding high-power laser radiation in water is the energy transferred to the jet by absorption, decreasing its stability. A model of laser water interaction in the water jet has been developed and validated experimentally. Based on the results an upscaling of system technology to 30 kW is discussed, enabling a high potential in cutting challenging materials at high qualities and high speeds.