PRODUCTS

YVO4 CRYSTAL

The yttrium orthovanadate (YVO4) is a positive uniaxial crystal grown with Czochralski method. It has good mechanical and physical 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, Glan polarizers, and other polarizing optics, etc.

Parameter

Specs

Angle tolerance:

dθ< ± 0.5°; dφ< ±0.5°

Dimensional Tolerance:

(W ± 0.1mm) x (H ± 0.1mm) x (L + 0.2/-0.1mm)

Flatness:

<L/8 at 633nm                

Surface Quality(S/D):

10/5 before coating,  20/10 after coated

Parallelism:

< 20 arc seconds

Perpendicularity:

< 5 arc minutes

Wavefront Distortion:

<L/8 at 632.8nm                

Clear Aperture:

Central 95%

Bevel (leg width):

<0.15mm x 45degree                

Coating:

* Protective coating is required to prevent polished surfaces from fogging.

 

* Anti-reflective coating should be considered if low reflectivity is required.

Mount:

Black Anodized Aluminium

Transmitting range

400~5000nm

Crystal Symmetry

Zircon tetragonal, space group D4h

Crystal Cell

a=b=7.12 °, c=6.29 °

Density

4.22 g/cm2

Hygroscopic Susceptibility

Non-hygroscopic

Mohs Hardness

5 glass like

Thermal Optical Coefficient

△na /dT=8.5x10-6 /K; dnc /dT=3.0x10-6 /K

Thermal Conductivity Coefficient

||C: 5.23 w/m/k; ⊥C:5.10w/m/k

Crystal Class

Positive uniaxial with no=na=nb, ne=nc

Refractive Indices,

no=1.9929, ne=2.2154, △n=0.2225, ρ=6.04°, at 630nm

Birefringence( Dn=ne-no)

no=1.9500, ne=2.1554, △n=0.2054, ρ=5.72°, at 1300nm

and Walk-Off Angle at 45 deg(ρ)

no=1.9447, ne=2.1486, △n=0.2039, ρ=5.69°, at 1550nm

Sellmeier Equation ( l in mm)

no2 =3.77834+0.069736/(λ2 -0.04724)-0.0108133λ2
ne2 =4.5905+0.110534/(λ2 -0.04813)-0.0122676λ2

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