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 | |