This paper reports the high-accuracy Sellmeier and thermo-optic dispersion formulas for the ordinary ray of a 5mol.%
MgO-doped congruent LiNbO3 that provide an excellent reproduction of the temperature-dependent birefringent and
quasi-phase-matching conditions with oo-e and oo-o interactions coupled with our Sellmeier and thermo-optic dispersion
formulas for the extraordinary ray of this material.
We believe that these equations could be highly useful for practically designing the frequency conversion systems
based on the periodically poled 5mol.% MgO-doped congruent LiNbO<sub>3.</sub>
This paper reports the temperature-dependent phase-matching properties of 1.3mol% MgO doped stoichiometric LiNbO<sub>3</sub> (1.3mol%MgO:SLN) together with the new Sellmeier equations, which reproduce well our experimental results for the birefringent phase-matching data for second-harmonic generation (SHG) and sum-frequency generation (SFG) in the 0.41-2.03μm range. It was found that a set of our index formula are useful for predicting the temperature-dependent phase-matching conditions of 1.3mol%MgO:SLN coupled with the thermo-optic dispersion formula for a 5mol% MgO doped congruent LiNbO<sub>3</sub> (MgO:CLN) published in our papers. In addition, the temperature-tuned 90° phase-matched SHG and SFG in the undoped stoichiometric LiNbO3 fabricated by vapor transport equilibration (VTE:SLN) are also presented.