| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing paraelectric periodic twin-crystals enabling quasi phase matching in which signs of a nonlinear optical constant are periodically inverted, in a borate-based crystal as paraelectrics.SOLUTION: The method for producing paraelectric periodic twin-crystals forms a periodic twin-crystal structure by periodically moving a partially molten area of a crystal having a single twin interface. Further, the method for producing paraelectric periodic twin-crystals includes a step of producing bulk periodic twin-crystal structure using the periodic twin-crystal as a seed crystal. |
