Periodical poling characteristics of 5mol MgO-doped congruent LiNbO_3 crystals at elevated temperature

摘要

A large cross-section quasi-phase-matched device using 5 mol% MgO-doped LiNbO_3 (MgO:LN) crystal for high-power wavelength conversion was realized. We have found that the coercive field to invert polarization of the crystal reduces drastically with elevated temperature. The coercive field reduces to 1.2 kV/mm at 250℃, which is about 1/4 compared with that for MgO:LN at room temperature (RT) and about 1/17 of that for LN at RT. 3mm-thick periodically poled MgO:LN has been successfully fabricated with 30 μm period.