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.
Advantages of α-BBO：
? High UV transmittance
? Large birefringence
? High damage threshold
? Stable physical and mechanical properties
Table 1. Basic Properties of α-BBO
Thermal Expansion Coefficients（/℃）
Sellmeier Equation（λ in μm）
Table 2. Specifications of α-BBO
Optical Axis Orientation
λ/4 @ 633nm
Upon Customer’s Specification
Figure 1. Transparency Curve
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