Study of the activator impurity distribution by the length of the solid-state laser active element

Spectra of the Raman scattering of yttrium aluminum garnet (Y₃Al₅O₁₂) doped neodymium (Nd³⁺) an active element of solid-state laser are given in different points by the length. Interpretation of spectrograms allowed to separate the peaks directly correlate with the crystallomatrix and with impurities in it. Assuming that the intensity of the Raman scattering by ions is proportional to their concentration, the distribution of average concentration of neodymium ions and the deviation from average value along the laser element was estimated. It appeared that the neodymium ions distribution nonuniformity by the laser element length didn´t exceed 9 - 12%.