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α-BBO
- 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 α-BBO crystal are similar to those of β-BBO. However, the nonlinear optical properties of α-BBO crystal are nonexistent due to the centric symmetry with its crystal structure. α-BBO crystal is not recommended for NLO processes.
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Advantages of α-BBO：
• High UV transmittance
• Large birefringence
• High damage threshold
• Stable physical and mechanical properties
Table 1. Basic Properties of α-BBO
|
Transparency Range |
190-3500nm |
|
Density |
3.85g/cm3 |
|
Hygroscopic Susceptibility |
Low |
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Hardness (Mohs) |
4.5 |
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Thermal Expansion Coefficients（/℃） |
9.3×10-6（C） 9.5×10-6（A） |
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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 |
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Sellmeier Equation（λ in μm） |
no2=2.7471+0.01878/(λ2-0.01822)-0.01354λ2 |
Table 2. Specifications of α-BBO
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Size |
1mm-40mm |
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Surface Quality |
10/5 |
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Optical Axis Orientation |
6′ |
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Parallelism |
＜10″ |
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Flatness |
λ/4 @ 633nm |
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Clear Aperture |
＞90% |
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Coating |
AR-coating |
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Mount |
Upon Customer’s Specification |
Figure 1. Transparency Curve
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Birefringent Crystals_α-BBO.pdf
