Refractive indices of laser nanocrystalline ceramics based on Y 3 Al 5 O 12

Refractive indices of the nanocrystalline Y 3 Al 5 O 12 ceramic and a garnet single crystal of the same composition have been measured. In the visible and near IR range (0.4–1.064 μm), the prism method was used; in the medium IR range (2–6.2 μm), the interference method with the use of thin plates was applied. The refractive indices of these crystalline materials are practically the same over the entire spectral range studied and are described by the approximate formula proposed earlier for a single crystal. The parameters of the continuos-wave lasing in the nanocrystalline Y 3 Al 5 O 12 ceramic doped with Nd 3+ and Yb 3+ ions measured recently are presented.