Photonic crystal spatial filters is a potential solution to suppress multimode operation in micro-cavity lasers increasing the output beam spatial quality and its brightness. Here we propose that the operation of such PhCs can be improved by solving the inverse design problem with the use of chirped structure seed configuration without performing costly global searches. We experimentally prove the feasibility of such method by fabricating the PhC filters in Foturan photosensitive glass, opening new opportunities for photonic integration. The improvement goes beyond earlier achievements by factor of two for different desired lengths of the crystal.
Darius Gailevičius, Vytautas Purlys, Martynas Peckus, Roaldas Gadonas, and Kestutis Staliunas, "Beam shaping with numerically optimized photonic crystals," Proc. SPIE 10085, Components and Packaging for Laser Systems III, 1008510 (Presented at SPIE LASE: February 02, 2017; Published: 22 February 2017); https://doi.org/10.1117/12.2254735.
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