Progress in synthesis technologies leads to appearance of new materials for laser industry, which can be used in various
applications, e.g., in optical parametrical oscillators, for Raman conversion, for passive laser pulse shaping, and as lasing media. Recently using new active media –neodymium and ytterbium doped ceramics authors of [1–6] demonstrated highly efficient laser operation at 1.0 and 1.3 lm. They found out that spectroscopic properties of doping ions in these materials are comparable with and in some features even overcome those observed in appropriate single crystals. Moreover, the concentration of doping ions can be several times greater than that achieved for single crystals [7,8]. All these advantages accompanied by a rather cheap and flexible fabrication technique allows considering ceramics competitive lasing media in comparison with traditional materials, at least for microchip lasers.