Rutile（TiO2）crystal has large birefringence and refractive index, is an ideal material for spectral prisms and polarization devices (e. g., optical isolators and beam splitter). Rutile (TiO2) crystal has better physicochemical stability than YVO4.
| Main performance parameters | |
| Crystal structure | Tetragonal |
| Growth method | Optical floating zone method |
| Lattice constant | a=4.5936Å c=2.9582 Å |
| Density | 4.26（g/cm3） |
| Mohs hardness | 7（mohs） |
| Thermal capacity | 0.17（25℃） |
| Transmission range | 0.5～4.5um |
| Refractivity | no=2.47 ne=2.73 @ λ=1.3μm |
| Dielectric constant | ~180 // <001>; ~90 ⊥<001> |
| Thermo-optical coeffecient | dη/dT：a：-0.72×106/k ; c：-0.42×10-6/k |
| Thermal expansivity | a：7.14×10-6 /K；c：9.19×10-6/K |
| Boule dimension | Φ17×80mm |
| Orientation | <100>;<110>; <001>;<111> |
| Orientation tolerance | ±0.5° |
| Dimension | 5×5mm、5×10mm、10×10mm |
| Dimension tolerance | ±0.05mm |
| Processing parameters for prisms | |
| Parallelism | <30″ |
| Flatness | <λ/4 |
| S/D | 20/10 |
| Polishing | One side or two sides |
| Packing | Class 100 clean bag, Class 1000 clean room |
