Method for immobilizing the domain-inverted regions formed in a ferroelectric single crystal, and an optical device using the same

摘要

How to easily immobilized polarization inversion region formed in the ferroelectric single crystal, and, it is an object of the present invention to provide an optical element containing the ferroelectric single crystal. A method for immobilizing the domain-inverted regions formed in a ferroelectric single crystal, by including the step of irradiating a beam of either neutral beam or ion beam ferroelectric single crystal, and its An optical element comprising a ferroelectric single crystal, and is characterized in that is produced by a process including the step.