Coherent Ray Tracing Simulation Of Non-Imaging Laser Beam Shaping With Multi-Aperture Elements Raoul Kirner, Wilfried Noell, Toralf Scharf and Reinhard Voelkel EPJ Web Conf., 215 (2019) 01001 Published online: 10 September 2019 DOI: 10.1051/epjconf/201921501001