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Uniform MgO-doped near-stoichiometric LiNbO 3 was successfully grown from Li-rich melts by a melt supplying technique. Periodically poled domains were demonstrated in MgO-doped near-stoichiometric LiNbO 3 wafers. Efficient quasi-phase-matched difference frequency generation was achieved in a titanium-diffusion waveguide based on periodically poled MgO-doped near-stoichiometric LiNbO 3 . The conversion efficiency was −7.3 dB with a pump power of 150 mW and a signal power of 50 mW at roomdoi:10.1364/ol.34.002480 pmid:19684822 fatcat:yxzz7dqeofbttajqxukc3xxebi