Yttrium Vanadate(YVO4) Crystal---Special crystal For Fiber Optics

The Yttrium Orthovanadate (YVO4) is a positive uniaxial crystal grown with Czochralski method. It has good temperature stability and physical and mechanical properties and is ideal for optical polarizing components because of its wide transparency range and large birefringence. It is an excellent synthetic substitute for Calcite (CaCO3) and Rutile (TiO2) crystals in many applications including fiber optic isolators and circulators, interleavers, beam displacers and other polarizing optics (refer to Table 1)

Table 1.Comparison of basic properties between YVO4 and Other Birefringent Crystals.

Thermal Expansion (/) c-axis 11.4x10-6 9.2x10-6 26.3x10-6 16.7x10-6
a-axis 4.4x10-6 7.1x10-6 5.4x10-6 7x10-6
Refractive Index no 1.9447@1550nm 2.454@1530nm 1.6346@1497nm 2.2151@1440nm
ne 2.1486@1550nm 2.710@1530nm 1.4774@1497nm 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 0.4-5μm 0.4-5μm 0.35-2.3μm 0.4-5μm

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 1.25x1.25x0.5mm to 3x3x15mm to meet OEM customer's requirement.
  • Quick delivery
  • Very competitive price
  • Strict quality control;
  • Very competitive price

    Basic Properties of YVO4 crystals:

Transparency Range: High transmittance from 0.4 to 5 μm
Crystal Symmetry: Zircon Tetragonal, space group D4h
crystal Cell: a=b=7.12A;c=6.29A
Density: 4.22 g/cm3
Mohs Hardness: 5, glass-like
Hygroscopic Susceptibility: Non-hygroscopic
Thermal Expansion Coefficiet: αa=4.43x10-6/K;αc=11.37x10-6/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 0.63mm
no=1.9500,ne=2.1554,△n=0.2054,ρ=5.72° at 1.30mm
no=1.9447,ne=2.1486,△n=0.2039,ρ=5.69° at 1.55mm
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

YVO4 crystal application
YVO4 crystal are widely used in fiber-optic isolators,beam displacers for fiber optical circulators, and interleavers, etc.

1.Specifications of birefringent wedges for fiber-optic isolators

Aperture 1.0x 1.0mm2 to 4x4mm2
Dimension tolerance +/-0.05mm
Wedge Angle tolerance +/-0.1°
Optical axis orientation +/-0.5°
Flatness λ/4 @ 632.8 nm
Surface Quality 20-10
AR-coating R<0.2% @1550 or 1310nm
Standard Size
1.25mmx1.25mmx0.5mm with 13° or 15° wedge, phi=22.5°

2.Specifications of YVO4 beam displacers for fiber-optic circulators or interleaver

Dimension tolerance W(+/-0.05mm)xH(+/-0.05mm)xL(+/-0.1mm)or(+/-0.003mm)
Optical axis orientation +/-0.5°
Parallelism <15 arc sec
Perpendicularity <10 arc min
Flatness λ/4 @ 632.8nm
Surface Quality 20/10
AR-coating R<0.2% @1550 or 1310nm +/-40nm
Standard Size
Note:Other sizes and specifications are available upon request
2.6x2.6x10mm, θ=45°,Φ=0°

YVO4 Beam Displacer for circulator


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