YVO4 BeamDisplacer用結晶
Yttrium Vanadate（YVO4）は、Czochralski法で成長させた透明な結晶です。
その優れた物性から、光学偏光部品に理想的です。
広い透明度範囲と大きな複屈折を持ち、ファイバーオプティックのアイソレータやサーキュレーター、インタリーバ、ビームディスプレーサーなどの偏光光学部品において、カルサイト（CaCO3）やルチル（TiO2）結晶の優れた合成代替品となります。
Comparison of basic properties between YVO4 and Other Birefringent Crystals.
| YVO4 | TiO2 | CaCO3 | LiNbO3 | |
|---|---|---|---|---|
| Thermal Expansion(/℃) |
c-axis: 11.4 x 10-6,a-axis: 4.4 x 10-6 | c-axis: 9.2 x 10-6,a-axis: 7.1 x 10-6 | c-axis: 26.3 x 10-6,a-axis: 5.4 x 10-6 | c-axis: 16.7 x 10-6,a-axis: 7 x 10-6 |
| Refractive Index | no: 1.9447@1550nm,ne: 2.1486@1550nm | no: 2.454@1530nm,ne: 2.710@1530nm | no: 1.6346@1497nm,ne: 1.4774@1497nm | no: 2.2151@1440nm,ne: 2.1413@1440nm |
| Birefringence(ne-no) | 0.2039@1550nm | 0.256@1530nm | -0.1572@1497nm | -0.0738@1440nm |
| Mohs Hardness | 5 | 6.5 | 3 | 5 |
| Deliquescence | None | None | Weak | None |
| Transparency range | 0.4-5 µm | 0.4-5 µm | 0.35-2.3 µm | 0.4-5 µm |
A reliable supplier of YVO4 crystal
CASTECH is one of the earliest companies who devotes to research and have mastered the advanced growth technique of YVO4 crystal. Now CASTECH has completed its strong mass-production line that can provied:
- Various size bulk and finished high quality YVO4 crystals up to φ35x50mm3 and φ20x20mm3, respectively;
- Large quantity YVO4 wedges and displacers used for fiber optical isolators and circulators, interleavers, in size 1.25×1.25×0.5mm to 3×3×15mm to meet OEM customer’s requirement.
- Quick delivery
- Very competitive price
- Strict quality control;
- Very competitive price
Basic Properties of YVO4 crystal
| Transparency Range: | High transmittance from 0.4 to 5 µm |
|---|---|
| Crystal Symmetry: | Zircon Tetragonal, space group D4h |
| crystal Cell: | a=b=7.12 A;c=6.29 A |
| Density: | 4.22 g/cm3 |
| Mohs Hardness: | 5, glass-like |
| Hygroscopic Susceptibility: | Non-hygroscopic |
| Thermal Expansion Coefficiet: | αa=4.43 x 10-6/K; αc=11.37 x 10-6/K |
| Thermal Conductivity Coefficient: | //C:5.23 W/m/K; ⊥C:5.10 W/m/K |
| Crystal Class: | Positive uniaxial with no=na=nb,ne=nc |
| Thermal Optical Coefficient: | Dna/dT=8.5x10-6/K;dnc/dT=3.0x10-6/K |
| Refractive Indices, Birefringence (△n=ne-no) and Walk-off Angle at 45°(ρ): |
no=1.9929,ne=2.2154,△n=0.2225,ρ=6.04° at 630 nm no=1.9500,ne=2.1554,△n=0.2054,ρ=5.72° at 1300 nm no=1.9447,ne=2.1486,△n=0.2039,ρ=5.69° at 1550 nm |
| Sellmeier Equation (λ in µm): | no2=3.77834+0.069736/(λ2-0.04724)-0.0108133λ2 ne2=4.59905+0.110534/(λ2-0.04813)-0.0122676λ2 |
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