YVO4
Yttrium Vanadate (YVO4) Crystal
YVO4(Yttrium Vanadate) is a positive uniaxial crystal with fine physical properties, broad transparency range, large birefringence and easy machining. It has been widely applied in fiber optical communications and optical passive components including isolators, optical rotators, delayers, 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:
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Transparency Range
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High transmittance 0.4-5μm
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Crystal Symmetry
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Zircon Tetragonal，Space groupD4h
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Lattice Parameters
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a=b=7.12A;c=6.29A
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Density
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4.22g/cm3
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Mohs
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5 (glass like)
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Deliquescence
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NO
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Thermal Expansion Coefficient
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αa=4.43×10-6/K ；αc=11.37×10-6/K
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Thermal Conductivity
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//C: 5.23W/m/K ⊥C: 5.10W/m/K
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Crystal Class
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Positive uniaxial with no=na=nb,ne=nc
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Thermo-optic Coefficient
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dno/dT=8.5×10-6/K
dne/dT=3.0×10-6/K |
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Refractive Indices Birefringence Coefficient (△ n = ne-no) and Walk Angle at45°
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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
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Sellmeier Equation(I in mm)：
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no 2 =3.77834+0.069736/（λ2）-0.0108133λ2 -0.04724 ne 2 =4.59905+0.110534/（λ2）-0.0122676λ2 -0.04813
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Technical parameters：
Birefringent wedge plate used in fiber optical isolators
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Aperture
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1.0×1.0mm2 to 4×4 mm2
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Dimension Tolerance
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±0.5mm
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Wedge Angle Tolerance
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±15%
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Optical Axis Orientation
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±0.5°
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Flatness
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λ/4 @ 632.8nm
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Surface Quality
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20/10
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AR-coating
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R<0.2%@1550or1310nm
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Standard Size
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1.25mm×1.25mm×0.5mm with13°or 15°，phi=22.5°
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Note: Other Sizes and Coating Are Available Upon Request
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Pure YVO4 used in optical circulators and optical beam displacers
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Dimension Tolerance
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W(±0.5mm)×H(±0.5mm)×L(±0.1mm)or(±0.003mm)
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Optical Axis Orientation
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±0.5°
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Parallelism
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<10〞
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Perpendicularity
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5′
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Flatness
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λ/8 @ 632.8 nm
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Surface Quality
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20/10
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AR-coating
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R<0.2%@1550or1310nm±0.4nm
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Standard Size
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2.6×2.6×10mm,θ=45°,Ф=0°
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Note: Other Sizes and Coating Are Available Upon Request
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Contact us
ADD: 3F，Bldg4,M9511 Industrial Park,18 Majiang Rd Mawei ,Fuzhou,Fujian,350015,China
P.C.:350015
TEL: +86 591 88023630
FAX: +86 591 88023637
E-mail: sales@hgoptronics.com
