Abstract

As design algorithms for diffractive optical elements improve, the limiting factor becomes the fabrication process. It is hoped a better understanding of fabrication errors will allow elements with greater tolerance to be designed. This is important for high-power laser fiber coupling, where hot spots lead to failure. We model seven different fan-out gratings applying misetch, misalignment, and feature rounding. Our main findings are that misetch can lead to improved results, misalignment is strongly asymmetric, and both the π and $\pi /2$ masks can dominate misalignment. Rounding has a $r^2$ dependence and potentially can be incorporated into the design stage. Finally we present some experimental data for misalignment.

© 2007 Optical Society of America

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