(Yttrium Vanadate )
The Yttrium Orthovanadate (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
|
Dimension Tolerance
|
±0.1mm
|
Flatness
|
λ/10 @ 632.8nm
|
Wavefront distortion
|
λ/10@ 632.8nm
|
Surface Quality
|
10/5 per MIL-O-13830B
|
Parallelism
|
10″
|
Perpendicularity
|
10′
|
Bevel/Chamfer
|
<0.1mm@45deg.
|
Chips
|
<0.1mm
|
Clear Aperture
|
>95%
|
Coating
|
AR/HR/PR coating upon customer’s request
|
Damage Threshold
|
750MW/CM2 at 1064nm, TEM00, 10ns, 10Hz
|
Quality Warranty Period
|
One year under proper use
|