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α-BBO (α-BaB2O4) is a uniaxial negative crystal with a large birefringence in a wide penetration range of 190-3500nm.α -BBO is especially excellent in UV and high-power applications. The physical, chemical, optical, and thermal properties of the α -BBO are similar to those of the BBO crystals, but the α -BBO does not exhibit the nonlinear optical properties because of the central symmetry of its crystal structure.
Product Description
α-BBO (α-BaB2O4) is a uniaxial negative crystal with a large birefringence in a wide penetration range of 190-3500nm.α -BBO is especially excellent in UV and high-power applications. The physical, chemical, optical, and thermal properties of the α -BBO are similar to those of the BBO crystals, but the α -BBO does not exhibit the nonlinear optical properties because of the central symmetry of its crystal structure.
Main Features
High ultraviolet through
Larger birefringence
High injury threshold
Stable physical and chemical properties
Material Properties
| Transmission range | 190-3500nm |
| Density | 3.85g/cm3 |
| Hygroscopy | low |
| Moh's hardness | 4.5 |
| Thermal expansion coefficient (/℃) | -9.3×10-6（C）-9.5×10-6（A） |
| Damage threshold | 1GW |
| Refractive index | no=1.6776，ne=1.5534，at 532nmno=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 |
Product Parameter
| Size | 1mm-40mm |
| Finish | 10/5 |
| Light axis orientation accuracy | 6′ |
| Depth of parallelism | ＜10″ |
| Flatness | λ/4 @ 633nm |
| Effective optical aperture | ＞90% |
| Coating film | reflection reducing coating |
