LiNbO3(Lithium Niobate) crystal has high mechanical and chemical stability,good physical properties,wide transparency range as well as high optical homogeneity.LiNbO3 crystal is widely used as frequency doublers for wavelength > 1mm and optical parametric oscillators (OPOs) pumped at 1064 nm.Due to its large electro-optic and acousto-optic coefficients,LiNbO3 crystal is the most commonly used material for Pockels Cells,Q-switches and phase modulators,waveguide substrate,and surface acoustic wave (SAW) wafers, etc.