The possibility of fabrication of the active elements from the Nd:YAG singlecrystals and ceramics is determined by the perfection degree of their crystal structure. One of the imperfection reasons is the presence of the impurity crystal phases. The X-ray analysis for their determination, which is carried out on the finished substances is commonly used. Since some of them appear to be useless for active elements, the problem of express structure analysis of singlecrystals and the ceramics in the synthesis process is actual. In present paper the luminescent analysis is presented, which can be used for determination of synthesized substances quality. The luminescence was exited by CLAVI-device [1]. The singlecrystals, nanopowders and nanoceramics with the composition similar to Nd:YAG stoichiometry were investigated. The general forms of the samples spectra are similar, but there are some differences in the intensities of the certain bands. The differences were observed upon the Nd3+ radiation bands in the 450-475nm (S1) and 550-575nm (S2) ranges. These bands have a common upper level 2D5/2 [2]. As intensities of these bands light-amounts s1 and s2 are accepted, they are normalized to common light-amount S0(350-650nm). The dependence of intensities of all spectral bands on yttrium content in the crystals are characterized by the indetermination in the rage of yttrium content C0=44.93% corresponding to YAG stoichiometry. There is the linear dependence between s1 and s2. The experimental points of s1 and s2 of nanopowders form the individual group, which corresponds to yttrium content of C>C0. These points are situated above the correlation curve of the crystals, but out of indetermination range. In this range the linear correlation between s1 and s2 is also observed. The nanoceramics was synthesized by the technology described elsewhere [3]. The experimental points of the ceramics form the individual group with the yttrium content of C<C0 at s2 is about constant.

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1. Investigation of luminescece of Nd: Y₂O₃ ceramics
2. The Luminescent Investigation of Laser Nanomaterials Nd: Y₂O₃ and Nd :YAG.