Observation of stimulated Raman scattering in Y3Al5O12 single crystals andnanocrystalline ceramics and in these materials activated with laser ions Nd3+ and Yb3+

High-order Raman parametric generation was excited in the visible and near- IR regions on the Stokes and anti-Stokes lines of Y3Al5O12 single crystals and nanocrystalline ceramics. All generation components, as well as the chi ((3))-active vibrational modes of these materials, were identified. In con nection with the extensive use of the Nd3+- and Yb3+-doped Y3Al5O12 crystal s and, in recent years, nanocrystalline Y3Al5O12 : Nd3+ ceramics in laser p hysics and quantum electronics, the applied aspect of the observed nonlinea r properties of these materials is outlined. (C) 2000 MAIK "Nauka/Interperi odica".