Optimization of Lightguide with Continuously Modulated Grating Regions

In the design process of lightguide optical devices in the field of augmented and mixed reality applications (AR & MR), lateral uniformity (per field of view mode) and overall efficiency are two of the most important merit functions. In order to achieve appropriate values for the uniformity and efficiency in a lightguide system, it is necessary to allow for a variation of the grating parameters, particularly in the expander and/or outcoupling region. For this purpose, VirtualLab Fusion enables the introduction of smoothly varying grating parameters in a grating region and provides the necessary tools to run an optimization according to a defined merit functions. This use case demonstrates the optimization of a lightguide with continuously varying values of the fill factor in order to obtain an adequate uniformity.