OST Photonics α-BBO Crystals
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 nonlinear crystaldue 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.
Applications ofα-BBO Crystals
High power Beam displacers for isolators.
High power Polarizer
Time delay compensators
Advantages of α-BBO Crystals
High UV transmittance
Large birefringence
High damage threshold
Specifications of α-BBO Crystals
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Tolerance of cutting angle |
△θ≤±0.25°,△φ≤±0.25° |
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DimensionTolerance |
±0.1mm |
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Flatness |
λ/10 @ 632.8nm |
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Wavefront distortion |
λ/4@ 632.8nm |
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Surface Quality |
10/5 per MIL-O-13830B |
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Parallelism |
10″ |
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Perpendicularity |
10′ |
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Bevel/Chamfer |
|
|
Chips |
<0.1mm |
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Clear Aperture |
>95% |
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Coating |
AR/HR (IAD, EB, IBS) coating upon customer’s request |
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Damage Threshold |
750MW/CM2 at 1064nm, TEM00, 10ns, 10Hz |
|
Quality Warranty Period |
One year under proper use |
Basic Properties of α-BBO Crystals
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Transparency Range |
190-3500nm |
|
Hygroscopic Susceptibility |
Low |
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Density |
|
|
Mohs Hardness |
|
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Thermal Expansion Coefficients（/℃） |
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Damage Threshold |
1GW |
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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)-0.01354λ²ne²=2.37153+0.01224/(λ²-0.01667)-0.01516λ² |
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