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        • Product name: YVO4
        • Product ID: 124
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        Yttrium Vanadate(YVO4)  is a positive uniaxial crystal grown with Czochralski method. It has good temperature stability and physical and mechanical properties. It 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 betweenYVO4 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 crystal

        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 630nm
        no=1.9500,ne=2.1554,△n=0.2054,ρ=5.72° at 1300nm
        no=1.9447,ne=2.1486,△n=0.2039,ρ=5.69° at 1550nm
        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°


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

        Dimension tolerance W(+/-0.05mm)xH(+/-0.05mm)xL(+/-0.1mm)
        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°