Patent ID: 9175420
Filing Date: 2015-11-03
Classification: C30B

Abstract:
1. A composition comprising a rare-earth oxyorthosilicate crystal having a composition described by L 2 A 2y R 2(1-x-y) SiO 5 , where R represents at least one first rare-earth element, L represents at least one second rare-earth element, A represents at least one group 7 element and optionally at least one group 2 element, 0<x≦10% and 0<y≦10%, and 0.005≦(y/x)≦5.0, the crystal being made by a process comprising: preparing a melt by: providing a seed crystal; contacting the surface of the melt with the seed crystal; withdrawing the seed crystal from the melt to obtain a crystal boule; and obtaining from the boule a crystal.