YVO4
Description:
Yttrium orthovanadate(YVO4) is a positive uniaxial crystal grown with Czochralski method. It has a wide transparency range and larger birefringence, which make it widely used in many applications in particular fiber optics field. YVO4 is an excellent synthetic substitute for calcite and rutile crystal.
Physical and Optical Properties:
| Transparency 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=8.5x10-6/K; dnc/dT=3.0x10-6/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,birefringence(Dn=ne-no) and walk-off angle at 45º(ρ) | No=1.9929,ne=2.2154,Dn=0.2225,ρ=6.04º,@ 630nm |
| No=1.9500,ne=2.1554,Dn=0.2054,ρ=5.72º,@ 1300nm | |
| No=1.9447,ne=2.1486,Dn=0.2039,ρ=5.69º,@ 1550nm | |
| Sellmeier equation (λ in μm) | no2=3.77834+0.069736/(λ2-0.04724)-0.0108133λ2 ne2=24.5905+0.110534/(λ2-0.04813)-0.0122676λ2 |
Specifications:
| Diameter | max. 25mm |
| Length | max. 30mm |
| Surface quality | 20/10 scratch/dig |
| Beam deviation | <3 arc min |
| Optical axis orientation | +/-0.5º |
| Flatness | λ/4 @633nm |
| Transmission wavefront distortion | <λ/2 @633nm |
| Coating | upon customer's request |