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
Tolerance of cutting angle |
△θ≤±0.25°,△φ≤±0.25° |
DimensionTolerance |
±0.1mm |
Flatness |
λ/10 @ 632.8nm |
Wavefront distortion |
λ/4@ 632.8nm |
Surface Quality |
10/5 per MIL-O-13830B |
Parallelism |
10″ |
Perpendicularity |
10′ |
Bevel/Chamfer |
|
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 |
Basic Properties of α-BBO Crystals
Transparency Range |
190-3500nm |
Hygroscopic Susceptibility |
Low |
Density |
|
Mohs Hardness |
|
Thermal Expansion Coefficients(/℃) |
|
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)-0.01354λ²ne²=2.37153+0.01224/(λ²-0.01667)-0.01516λ² |
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