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Undoped and Nd or Yb doped laser grade yttrium aluminum garnet and (Y,La) 2 O 3 ceramics with a transmittance above 80% in the 1 µm lasing region have been prepared by solid state reactions using nonagglomerated Y 2 O 3 and Al 2 O 3 nanopowders. The Y 2 O 3 nanopowders were prepared via laser evaporation, chemical precipitation from urea solutions, and grinding of commercially available Y 2 O 3 in a purpose designed laboratory scale attritor at stirrer rotation rates of up to 1500 rpm. The YAG ceramics were prepared using commercially available Al 2 O 3 . After grinding, all of the powders had a particle size on the order of a hundred nanometers. Green compacts produced from the nanopowders were sintered in a vacuum furnace between 1615 and 1750°C to give highly transparent ceramic samples.

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