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α-BBO (α-BaB2O4) is a negative uniaxial crystal which has large birefringence over a broad
transparent range of 190nm to 3500nm. α-BBO is an excellent crystal
especially in UV and high power applications.
The physical,
chemical, thermal, and optical properties of alpha-BBO crystal are similar to
those of Beta-BBO. However, there is no second order nonlinear effect in
alpha-BBO crystal due to the centrosymmetry in its crystal structure and thus
it has no use for second order nonlinear optical processes. Instead, alpha-BBO
is widely used for fabrication of polarizers, polarizing beam displacers, phase retarders,
birefringent plates, and time delay compensators especially those for UV and
high power lasers.
Product Origin:
ChinaShipping Port:
Fuzhou, ChinaLead Time:
3-4weeks
Descriptions:
a-BBO Crystal alpha -Barium Borate (α-BaB2O4) is a negative uniaxial crystal which has large birefringence over a broad transparent range of 190nm to 3500nm. α-BBO is widely used for fabrication of polarizers, polarizing beam displacers, phase retarders, birefringent plates, and time delay compensators especially those for UV and high power lasers.
Main applications:
1) High power Beam displacers for isolators.
2) High power Polarizer
3) Time delay compensators
Advantages:
4) High UV transmittance
5) Large birefringence
6) High damage threshold
Basice properties of YVO4 crystal:
|
Transparency Range |
190-3500nm |
|
Hygroscopic Susceptibility |
Low |
|
Density |
3.85g/cm3 |
|
Mohs Hardness |
4.5 |
|
Thermal Expansion Coefficients（/℃） |
9.3×10-6（C） 9.5×10-6（A） |
|
Damage Threshold |
1GW |
|
Refractive Indices |
no=1.6776，ne=1.5534，at 532nm no=1.6579，ne=1.5379，at 1064nm |
|
Sellmeier Equation（λ in μm） |
no2=2.7471+0.01878/(λ2-0.01822)-0.01354λ2 |
HGO offers a-BBO specifications:
|
Tolerance of cutting angle |
△θ≤±0.25°,△φ≤±0.25° |
|
±0.1mm |
|
|
Flatness |
|
|
Wavefront distortion |
λ/4@ 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 (IAD, EB, IBS) coating upon customer’s request |
|
Damage Threshold |
750MW/CM2 at 1064nm, TEM00, 10ns, 10Hz |
|
Quality Warranty Period |
One year under proper use |
Why Choose HGO ?
HG OPTRONICS.,INC. has the ability to supply high quality α-BBO (α-BaB2O4) in mass production quantity. Comparing with YVO4 , a-BBO crystal is more suitable for high power beam displacer for isolators and more and more isolators manufactures are looking for a-BBO as replacement of YVO4 beam displaces especially in high power system. In the past few years ,HGO has completed a mass-production line for high power a-BBO beam dispalcers and have wide experiences and strong ability to supply such crystals with large quantity and in short delivery time.
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