Abstract
A large cross-section quasi-phase-matched device using 5 mol% MgO-doped LiNbO3 (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°C, 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.
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