Abstract
A new LiNbO 3 bulk crystal has been grown by doping with MgO (cs-MgO:LN; Li 2O:Nb 2O 5:MgO=45.30:50.00:4.70, (Li 0.906Mg 0.047V Li 0.047)NbO 3), which successfully has the congruent point coinciding with the stoichiometric point. Its second-harmonic-generation (SHG) properties were evaluated. It was found that cs-MgO:LN has a much more homogeneous composition leading to uniform in-plane distribution of the non-critical phase-matching wavelength than the conventional LiNbO 3 crystals such as congruent LiNbO 3 (c-LN), stoichiometric LiNbO 3 (s-LN), and MgO-doped congruent LiNbO 3 (5MgO:LN). This homogeneity arose from the observation that none of the solute components including ionic species were segregated at the interface during growth. The SHG conversion efficiency of cs-MgO:LN is comparable to those of s-LN and 5MgO:LN.
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