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.
Properties:
| Transmitting range | 400~5000nm |
| Crystal Symmetry | Zircon tetragonal, space group D4h |
| Crystal Cell | a=b=7.12 °, c=6.29 ° |
| Density | 4.22 g/cm2 |
| Hygroscopic Susceptibility | Non-hygroscopic |
| Mohs Hardness | 5 glass like |
| Thermal Optical Coefficient | Dna /dT=8.5×10-6 /K; dnc /dT=3.0×10-6 /K |
| Thermal Conductivity Coefficient | ||C: 5.23 w/m/k; ⊥C:5.10w/m/k |
| Crystal Class | Positive uniaxial with no=na=nb, ne=nc |
| Refractive Indices, | no=1.9929, ne=2.2154, Dn=0.2225, ρ=6.04°, at 630nm |
| Birefringence( Dn=ne-no) | no=1.9500, ne=2.1554, Dn=0.2054, ρ=5.72°, at 1300nm |
| and Walk-Off Angle at 45 deg(ρ) | no=1.9447, ne=2.1486, Dn=0.2039, ρ=5.69°, at 1550nm |
| Sellmeier Equation ( l in mm) | no2 =3.77834+0.069736/(l2 -0.04724)-0.0108133l2 ne2 =4.5905+0.110534/(l2 -0.04813)-0.0122676l2 |
YVO4 Specifications:
| Diameter: | Max 25m |
| Length: | Max 35mm |
| Surface Quality: | better than 20/10 scratch/dig |
| Beam Deviation: | < 3 arc min |
| Optical Axis Orientation: | +/-0.2deg |
| Flatness: | < l/4 @632.8nm |
| Wavefront Distortion: | < l/2 @632.8nm |
| Coating: | Coating upon Request |