YVO4 Crystal
The yttrium orthovanature (YVO4) is a positive uniaxial crystal grown with the Czochralski method. It has good temperature stability, along with good 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, beam displacers and polarizing optics, etc.
Properties of YVO4 Crystals
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Transparency Range: |
High transmission from 0.4-5µm
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Crystal Symmetry: |
Zircon Tetragonal, Space group D4h
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Crystal Cell: |
a = b = 7.12A
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c = 6.29A
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Density:
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4.22g/cm3
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Mohs Hardness:
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5, (glass-like)
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Hygroscope Susceptibility:
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Non-hygroscope |
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Thermal Expansion Coefficient:
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αa = 4.43 x10-6/K |
αc = 11.37 x10-6/K
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Thermal Conductivity Coefficient:
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C|| : 5.23W/m/K
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Cperp : 5.10W/m/K
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Crystal Class:
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Positive uniaxial with no = na = nb
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ne = nc
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Thermal Conductivity Coefficient:
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dna/dT = 8.5×10-6/K
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dnc/dT = 3.0×10-6/K
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Refractive Indices, Birefringence (Δn = ne – no)
Walk-off Angle @ 45° (ρ): |
@ 0.63mm
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no = 1.9929
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ne = 2.2154
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Δn = 0.2225
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ρ = 6.04°
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@ 1.30mm
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no = 1.9500
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ne = 2.1554
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Δn = 0.2054
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ρ = 5.72°
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@1.55mm
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no = 1.9447
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ne = 2.1486
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Δn = 0.2039
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ρ = 5.69°
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Seamier Equation (λ in µm)
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no2 = 3.77834 + 0.069736 / (λ2 – 0.04724) – 0.0108133λ2
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ne2 = 4.59905 + 0.110534 / (λ2 – 0.04813) – 0.0122676λ2
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High quality YVO4 crystals with different dimensions are available. Sinoceramics can provide large quantities (~10,000 pcs/month) of YVO4 wedges and YVO4 displacers used in fiber optical isolators and circulators.