YVO Ctystal.docVIP

Yttrium Vanadate (YVO4) Crystal The yttrium orthovanadate (YVO4) is a positive uniaxial crystal grown with Czochralski method. It has good mechanical and physical properties and is ideal for optical polarizing components because of its wide transparency range and large birefringence. It is an excellent synthetic substitute for Calcite (CaCO3) and Rutile (TiO2) crystals in many applications including fiber optic isolators and circulators, beam displacers, Glan polarizers and other polarizing optics, etc. Basic Properties of YVO4 crystals Transparency Rangehigh transmittance from 0.4 to 5mm  Transparency Curve of YVO4(Thickness=1mm) Crystal SymmetryZircon Tetragonal, space group D4hCrystal Cella=b=7.12 Aring;; c=6.29 ? Density: 4.22 g/cm3Hygroscopic Susceptibility: Non-hygroscopicThermal Expansion Coefficient aa = 4.43 x 10-6/K; ac = 11.37 x 10-6/KThermal Conductivity Coefficient ||C: 5.23 W/m/K; ^ C: 5.10 W/m/KCrystal Class: Positive uniaxial with no=na=nb, ne=ncRefractive Indices, Birefringence (Dn = ne - no) and Walk-off Angle at 45o (r):no = 1. 9929, ne = 2.2154, Dn = 0.2225, r = 6.04 ????at 0.63 mmno = 1.9500, ne = 2.1554, Dn = 0.2054, r = 5.72 ????at 1.30 mmno = 1.9447, ne = 2.1486, Dn = 0.2039, r = 5.69 ????at 1.55 mmSellmeier Equation (l in mm):no2= 3.77834 + 0.069736/(l2 - 0.04724) - 0.0108133l2ne2=4.59905 + 0.110534/(l2 - 0.04813) - 0.0122676l2Thermal Optical Coefficient: dna/dT = 8.5x10-6/K; dnc/dT = 3.0x10-6/K Comparation with other Birefringent crystals Compared to Calcite, YVO4 has better temperature stability and physical and mechnical properties. Calcite is hard to obtain high optical quality because of its low susceptibility to moisture and low hardness. Compared to Rutile (TiO2) which exhibits too high hardness, YVO4 is easier to be handled for optical surface processing that greatly reduces cost of fabrication, especially for batch production. Compared to LiNbO3, although they have similar mechanical and