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    YVO4

    The Yttrium Orthovanadate (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).
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    Table 1. Comparison of  basic properties between YVO4 and other Birefringent Crystals

     

    YVO4

    TiO2

    CaCO3

    LiNbO3

    Thermal
    Expansion(/℃)

    c-axis

    11.4×10-6

    9.2×10-6

    26.3×10-6

    16.7×10-6

    a-axis

    4.4×10-6

    7.1×10-6

    5.4×10-6

    7×10-6

    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 crystals:

      CASTECH is one of the earliest companies who have mastered the advanced growth technique of YVO4 crystal. Now CASTECH has completed its strong mass-production line that can provide:
           ?   Various size of 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 of 1.25x1.25x0.5mm3 to 3x3x15mm3 to meet OEM customer’s requirement;

           ?   Quick delivery; 
           ?   Very competitive price;
           ?   Strict quality control;
           ?   Technical support.

     

    Table 2. Basic Properties of YVO4 crystal

    Transparency Range

    High transmittance from 0.4 to 5μm

    Crystal Symmetry

    Zircon Tetragonal, space group D4h

    Crystal Cell

    a=b=7.12?,c=6.29?

    Density

    4.22g/cm3

    Mohs Hardness

    5,glass-like

    Hygroscopic Susceptibility

    Non-hygroscopic

    Thermal Expansion Coefficient

    αa = 4.43×10-6/K;αc = 11.37 ×10-6/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 = 8.5×10-6/K;dnc/dT = 3.0×10-6/K

    Refractive Indices, Birefringence
    (Δn = ne- no)
    and Walk-off Angle @ 45° (ρ)

    no = 1.9929, ne = 2.2154, Δn = 0.2225, ρ= 6.04°   at 630nm
    no = 1.9500, ne = 2.1554, Δn = 0.2054, ρ= 5.72°    at 1300nm      
    no = 1.9447, ne = 2.1486, Δn = 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 crystals are widely used in fiber-optic isolators, beam displacers and optical circulators, etc.

     

    1. Specifications of birefringent wedges for fiber-optic isolators:

    Aperture

    1.0×1.0 mm2  to  4 × 4 mm2

    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

    1.25mm × 1.25mm × 0.5mm  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)× H (±0.05mm) × L (±0.1mm)             

    Optical axis orientation

    +/-0.5°

    Parallelism

    <15″

    Perpendicularity

    <10′

    Flatness

    λ/4 @ 632.8 nm

    Surface Quality

    20/10

    AR-coating

    R<0.2% @ 1550 nm or 1310nm ± 40 nm

    Standard Size

    2.6×2.6×10mm3, θ=45°, Φ=0°

    Note: Other sizes and specifications are available upon request

     

     

    YVO4 Beam Displacer for Circulator

     

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