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Undoped Yttrium Vanadate (YVO4) Crystals
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Pure YVO4 crystal is a positive uniaxial crystal with a wide
transparency range in IR, a large birefringence, and excellent
mechanical properties. It has been widely used in fabricating polarizers,
fiber optic isolators, circulators, and beam displacers. |
Basic Properties of Pure YVO4
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Transparency Range: 400 - 4000 nm |
Transmission Curve |
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Crystal Symmetry:Zircon
Tetragonal, D4h |
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Lattice Constants: a=b=7.12Å; c=6.29 Å
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Density: 4.22 g/cm3 |
Therm-Optic Coefficients:
dno/dT= 8.5 x 10-6 /oC
dne/dT= 3.0 x 10-6/oC
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Damage Threshold ( 10ns, 10Hz)
at 1064 nm 100 MW/cm2
at 532 nm 50 MW/cm2 |
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Optical Homogeneity: Δn < 10-6/cm
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Mohs Hardness: 5 |
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Thermal Expansion Coefficients |
αa = 4.4 x 10-6/K
αc = 11.4 x 10-6/K
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Linear Absorption Coefficient: α<0.01cm-1 from 400 to 5000 nm |
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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
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| Wavelength(nm) |
no |
ne |
Birefringence
(Δn=ne-no) |
Walk-off Angle
at 45° |
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1550 |
1.9447 |
2.1486 |
0.204 |
-5.67 |
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1300 |
1.9500 |
2.1554 |
0.205 |
-5.70 |
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1064 |
1.9571 |
2.1650 |
0.208 |
-5.74 |
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532 |
2.0177 |
2.2508 |
0.233 |
-6.22 |
Specifications of Pure YVO4
Components
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Dimension tolerance |
±0.05 mm |
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Wedge Angle tolerance |
0.1° |
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Surface Quality
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20/10 Scratch and Dig
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Optical Axis
Orientation |
+/-0.5° |
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Parallelism |
<15 arc sec |
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Perpendicularity |
<10 arc min |
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Flatness
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λ/4 @ 632.8 nm |
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Transmission
Wavefront Distortion |
< λ/4 @632.8 nm |
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AR-coating
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R<0.3% available upon request |
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