Abstract
A novel colloidal co-casting process was developed to fabricate laser quality, multisegment composite ceramic laser gain materials. The approach was demonstrated for a three segment transparent composite rod 62 mm long by 3 mm diameter consisting of undoped yttrium aluminus garnet (YAG), 0.25% Er:YAG, and 0.5% Er:YAG. The Er concentration profile in the composite has steep, controllable gradients at the segment interfaces, while maintaining constant dopant concentrations within each segment. The composite rod has 84% transmittance at 1645 nm (the lasing wavelength) with a scatter loss of 0.4% cm−1. Laser operation of such a composite Er:YAG ceramic rod was demonstrated for the first time, with nearly equivalent lasing behavior to an Er:YAG single crystal rod.
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Kupp, E.R., Messing, G.L., Anderson, J.M. et al. Co-casting and optical characteristics of transparent segmented composite Er∶YAG laser ceramics. Journal of Materials Research 25, 476–483 (2010). https://doi.org/10.1557/JMR.2010.0069
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DOI: https://doi.org/10.1557/JMR.2010.0069