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Q: Fachverband Quantenoptik und Photonik

Q 3: Photonics and Laser Development

Q 3.1: Poster

Montag, 20. September 2021, 16:30–18:30, P

Modelling of beam propagation for partially coherent light waves in diffractive systems — •Ulf-Vincent Sponholz and Edeltraud Gehrig — RheinMain University of Applied Science, Germany

In many technical applications diffractive systems are used to guide and shape light waves. Typically, these systems are designed according to properties and parameters of an ideal light beam. For a realistic description it is of interest to explicitly consider the beam properties as well as the spectrum of a given light source. We present a mathematical-physical model for the simulation of beam propagation and superposition of partially coherent waves. In the model, using the Fraunhofer approximation for imaging between optical planes, the propagation of light with variable spectral composition and coherence properties is explicitly considered. The beam passes a diffractive system (e.g. phase grating), realized by a corresponding transmission function in the imaging plane. Based on the model equations a practice-oriented Python program was developed, that allows the simulation and comparative analysis of different diffractive optical elements exposed to various light sources. Variable coherence properties (e.g. laser light or LEDs) are captured via a superposition of individual light components using Fourier transform methods. The program enables the realistic calculation of beam profiles after passing through an optical system as well as the adaptation of an imaging optics to a given light source.