Uniform MgO-doped near-stoichiometric was successfully grown from Li-rich melts by a melt supplying technique. Periodically poled domains were demonstrated in MgO-doped near-stoichiometric wafers. Efficient quasi-phase-matched difference frequency generation was achieved in a titanium-diffusion waveguide based on periodically poled MgO-doped near-stoichiometric . The conversion efficiency was with a pump power of and a signal power of at room temperature. It was found that the signal conversion bandwidth was as large as . Photorefractive damage of the device was examined by pump–probe second-harmonic generation at room temperature, and the device exhibited no significant wavelength shift.
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