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YVO4 crystal
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Pure YVO4 crystal is a positive uniaxial crystal with a wide transparency range in IR, a large birefringence, and excellent mechanical properties. It has been widely used in fabricating polarizers, fiber optic isolators, circulators, and beam displacers

Yttrium Vanadate (YVO4) Crystal
Undoped YVO4 (Yttrium Vanadate) is widely used in many beam displace because of its large birefringence. Good physical and favorable properties also make YVO4 well suited for compact fiber optical components, such as isolators, circulators, and polarizer etc..

Comparison with other birefringent crystals


Compared with Calcite, YVO4 has better temperature stability, physical and mechnical properties. And it is hard for Calcite to obtain high optical quality because of its low susceptibility to moisture and low hardness. Compared with Rutile (Tio2) which has high hardness, YVO4 is easier to be handled in optical surface processing which greatly reduces manufacturing cost, especially in batch production. Compared with LiNbO3, although they have similar mechanical and physical properties, YVO4 has three times larger birefringence, which makes your design more compact.

Basic properties of YVO4:

Transparency Range

High transmittance 0.4-5μm

Crystal Symmetry

Zircon TetragonalSpace groupD4h

Lattice Parameters

a=b=7.12A;c=6.29A

Density

4.22g/cm3

Mohs

5 (glass like)

Deliquescence

NO

Thermal Expansion Coefficient

αa=4.43×10-6/K αc=11.37×10-6/K

Thermal Conductivity

//C: 5.23W/m/K C: 5.10W/m/K

Crystal Class

Positive uniaxial with no=na=nb,ne=nc

Thermo-optic Coefficient

dno/dT=8.5×10-6/K
dne/dT=3.0×10-6/K

Refractive Indices Birefringence Coefficient ( n = ne-no) and Walk Angle at45°

no=1.9929, ne=2.2154, n=0.2225,p=6.04°at0.63mm no=1.9500, ne=2.1554, n=0.2054,p=5.72°at1.30mm no=1.9447, ne=2.1486, n=0.2039,p=5.69°at1.55mm

Sellmeier Equation(I in mm)

no 2 =3.77834+0.069736/λ2-0.0108133λ2 -0.04724 ne 2 =4.59905+0.110534/λ2-0.0122676λ2 -0.04813

 

Pure YVO4 used in optical circulators and optical beam displacers 

Dimension Tolerance

W(±0.5mm)×H(±0.5mm)×L(±0.1mm)or(±0.003mm)

Optical Axis Orientation

±0.5°

Parallelism

<10

Perpendicularity

5′

Flatness

λ/8 @ 632.8 nm

Surface Quality

20/10 MIL-PRF-13830B

AR-coating

R<0.2%@1550or1310nm±0.4nm R<0.1%@1064nm For high power laser

Standard Size

5.2×2.5×25mm,θ=45°,Ф=0°

Note: Other Sizes and Coating Are Available Upon Request

 

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