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A neodymium-doped glass waveguide laser based on a new structure employing two core layers is reported. This double-layer structure allows a photosensitive layer to be integrated with an efficient gain layer. Singlemode operation was obtained with a lasing threshold of 93 mW and an efficiency of 0.6%.doi:10.1049/el:20070679 fatcat:rbd4bbzogbcspfkuvcs6cq6d2q