YVO4

Undoped YVO4 crystal is widely used as polaizing beam displacer because of its large birefringence. It has good physical and favorable mechnical properties than others birefringent crystals, which make YVO4 well suited for compact fiber optical components, such as isolators, circulators and interleaver etc.

Physical and Optical Properties:

Transparency Range 400~5000nm
Crystal Symmetry Zircon tetragonal, space group D4h
Crystal Cell A=b=7.12 Å, c=6.29 Å
Density 4.22 g/cm 2
Hygroscopic Susceptibility Non-hygroscopic
Mohs Hardness 5 glass like
Thermal Optical Coefficient Dn a /dT=8.5x10 -6 /K; dn c /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( D n=ne-no) and Walk-Off Angle at 45° No=1.9929, ne=2.2154, D n=0.2225, Walk-Off=6.04° at 630nm
No=1.9500, ne=2.1554, D n=0.2054, Walk-Off=5.72° at 1300nm
No=1.9447, ne=2.1486, D n=0.2039, Walk-Off=5.69° at 1550nm
Sellmeier Equation ( λ in µm) n o^2 =3.77834+0.069736/( λ² -0.04724)-0.0108133 λ²; n e^2 =24.5905+0.110534/( λ² -0.04813)-0.0122676 λ²

General Specifications

1) Diameter : max. 25mm
2) Length: max. 30mm
3) Surface Quality: better than 2 0/10 scratch/dig Per MIL-0-13830A
4) Beam Deviation: <3 arc min
5) Optical Axis Orientation: +/-0.2deg.
6) Flatness: < l /4 @633nm
7) Transimission Wavfront Distortion: < l /2 @633nm
8) Coating: upon customer's Specification