YVO4


description:


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.


 

YVO4

TiO2

CaCO3

LiNbO3

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
SGoptics is one of the earliest companies who devotes to research and have mastered the advanced growth technique of YVO4 crystal. Now SGopticshas 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



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°

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