Process for producing garnet single crystal

摘要

According to the process of the present invention for producing a garnet single crystal fiber, a crystal is grown while the direction of a seed crystal, corresponding to the direction of growth, is set in a direction having angles of at least 10 DEG from a direction equivalent to the <100> orientation, at least 20 DEG from a direction equivalent to the <110> orientation and at least 20 DEG from a direction equivalent from the <211> orientation. The resulting garnet single crystal fiber does not include a core, which is formed due to facet formation, and has an excellent optical homogeneity necessary for use in an optical device such as a laser device or an isolator.