METHOD FOR GROWING GARNET SINGLE CRYSTAL AND GARNET SINGLE CRYSTAL SUBSTRATE

摘要

PROBLEM TO BE SOLVED: To provide a large size neodymium-gallium garnet single crystal substrate having high quality sufficient for producing a Bi-substituted rare earth-iron garnet material for a Faraday rotator by a liquid phase epitaxial method and to provide a method for growing a neodymium-gallium garnet single crystal for the substrate. SOLUTION: When the neodymium-gallium garnet (Nd3 Ga5 O12 ) single crystal is grown by a crystal pulling method, the number (x) of the rotation of a seed crystal being rotated on the surface of a melt of a raw material is controlled to 3<=x<=20 (rpm) and the temperature gradient (y) in the upward direction from the surface of the melt of the raw material is controlled to -100<=y<=-50 ( deg.C/cm).