I³MS - Wester Seminar
Dr. Rolf Wester - Modeling and Numerical Simulation of Lasers and Nonlinear Optical Systems
As in other fields of engineering numerical simulation is of fundamental importance for the development of new and innovative products in the field of optical systems technology. From the beginning of the Fraunhofer ILT and the RWTH Lehrstuhl für Laseretechnik LLT and recently the RWTH Lehrstuhl für die Technologie Optischer Systeme TOS optical modeling and numerical simulation has been an indispensable partner of experimental and engineering work. In addition to nowadays classical fields of optical modeling like geometric optical ray tracing and wave optical propagation for which treatment well developed commercial software packages are available there are new fields arising that need new solution methods. Quantitatively simulating three wave mixing with high power beams demands the inclusion of thermo-mechanics self consistently. According commercial software packages are not yet available. This gap has been filled with the wave optics package OPT developed during the last 15 years at ILT. The highly efficient LEDs developed in recent years make possible free form optical lens and mirror designs having a large number of degrees of freedom with which a broad class of prescribed light intensity patterns for street, home and automotive lighting can be realized. The mathematical treatment of this kind of design problems leads to highly nonlinear Monge-Ampere type PDEs. Numerical algorithms assuming incoherent point sources have been developed recently. But real light sources are extended and in case of laser light they are not incoherent. The development of robust and efficient algorithms for this class of problems is under way in a cooperation between TOS and the Institut für Geometrie und Praktische Mathematik IGPM.