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YVO4

The yttrium orthvanadate (YVO4) is a positive uniaxial crystal grown with Czochralski method. It has good temperature stability and physical and mechanical properties, wide transparency and large birefringence, so it is also ideal for optical components such as fiber optical isolators and circulators, beam displaces and other polarizing optics, etc.

Basic Properties:

Transparency Range

high transmittance from 0.4 to 5mm

Crystal Symmetry

Zircon Tetragonal, space group D4h

Crystal Cell

a=b=7.12Å; c=6.29 Å

Density:

4.22 g/cm3

Hygroscopic Susceptibility:

Non-hygroscopic

Thermal Expansion Coefficient

aa = 4.43 x 10-6/K; ac = 11.37 x 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 = 8.5x10-6/K; dnc/dT = 3.0x10-6/K
 
0.6341 mm

1.30 mm

1.55 mm

Refractive Indices:
no

1. 9929

1.950

1.9447

ne
2.2154
2.1554
2.1486

Birefringence (Dn = ne - no)

0.2225,

0.2054

0.2039

Walk-off Angle at 45º (r)

6.04º at

5.72º

5.69º

Sellmeier Equation (l in mm):

no2=3.77834 + 0.069736/(l2 - 0.04724) - 0.0108133l2

ne2=4.59905 + 0.110534/(l2 - 0.04813) - 0.0122676l2

Comparation with other Birefringent crystals

  YVO4 TiO2 CaCO3 LiNbO3
Thermal Expansion (/C°) 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 2x10-6
Refractive Index
no 1.9447
@550nm
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
@440nm)
Mohs Hardness 5 6.5 3 5
Transparency range 0.4-5mm 0.4-5mm 0.35-2.3mm
0.4-5mm

Applications of YVO4 Crystals:

Following drawings are the simple demonstrations of how the YVO4 crystals are used in Fiber Optic Isolator,
Beam Displacers, Circulators and interleaver.

Specifications

 

Dimension tolerance: ±0.05 mm
Wedge Angle tolerance:0.1°(wedges)
Optical axis orientation: ±0.5°
Parallelism: <15 arc sec
Perpendicularity: <10 arc min
Flatness: l/4 @ 632.8 nm
Surface Quality: 20-10
AR-coating: R<0.2% @1550±30nm

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