MgO:LiNbO3 is a negative uniaxial crystal, it can be used as NCPM, and has high frequency conversion efficiency. As the doped MgO, the damage  threshold is much higher than LiNbO3.

MgO:LiNbO3 typical orientations: ► q¹0°, f=-90°,  SHG Type I, fundamental wavelength range: 1.05—3.4mm.            q=82.3°, f=-90°, SHG 1064nm, type I (at temperature 24℃) ► q=90°, f=0°, NCPM MgO:LiNbO3 optical properties and physical are similar to LinbO3.

LiNbO3 optical properties. Transparency range           420—5200nm Refractive indices            ne=2.156, no=2.232 @1064nm Refractive indices            ne=2.203, no=2.286 @632.8nm Refractive indices            ne=2.146, no=2.220 @1300nm          Therm-optic coefficients         dno/dT=-9.3x10-6/℃ Therm-optic coefficients         dne/dT=-16.6x10-6/℃ NLO coefficients             d33=34pm/v NLO coefficients             d31=d15=5.95pm/v NLO coefficients             d22=3.07pm/v Electro-optic coefficients         gT33=32pm/v, gs33=31pm/v Electro-optic coefficients         gT31=10pm/v, gs31=8.6pm/v Electro-optic coefficients         gT22=6.8pm/v, gs22=3.4pm/v Half-wave voltage, DC           3.03KV  (Electrical field∥z, light ⊥z) Half-wave voltage, DC           4.02KV (Electrical field∥x or y,  light ⊥z) Damage threshold            100MW/cm2, 10ns, 1064nm Sellmeier equations  LiNbO3:  no2(l)=4.9048+0.11768/(l2-0.04750)-0.027169l2 Sellmeier equations  LiNbO3:  ne2(l)=4.5820+0.09917/(l2-0.04443)-0.021950l2 MgO:LiNbO3:    no2(l)=4.8762+0.11554/(l2-0.04674)-0.03378l2 MgO:LiNbO3:    ne2(l)=4.5469+0.09478/(l2-0.04539)-0.02672l2