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In article number 2001675, Uriel Levy, Shlomo Magdassi, and co‐workers report transparent yttrium aluminum garnet (YAG) gain‐medium structures at micrometer‐size, using 3D printing based on two‐photon polymerization of inks composed only of solutions. The printed objects are polycrystalline, and, upon doping with Nd, light emission is enabled. 3D printing of gain media at the microscale may be used...
Transparent ceramics are usually polycrystalline materials, which are wildly used in many optical applications, such as lasers. As of today, the fabrication of transparent ceramic structures is still limited to conventional fabrication methods, which do not enable the formation of complex structures. A new approach for 3D printing of micrometer‐size, transparent ceramic structures is presented. By...
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