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Alpha-BBO Crystals


  • High UV transmittance
  • Large birefringence
  • High damage threshold
  • Stable physical and mechanical properties
  • Low hygroscopic susceptibility

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Material α-BBO Size(mm) 1-40mm
Surface Quality 10/5 S/D Optical Axis Orientation   <6 arc min
Parallelism 10 arc sec Flatness λ/4@633nm
Clear Aperture >90% of full aperture Coating AR coating
Mount Upon customer’s requests

Basic Properties:

Transparency Range 190-3500nm Density 3.85g/cm3
Hygroscopic Susceptibility low Mohs Hardness 4.5
Damage Threshold >1GW/cm2 Sellmeler Equation(λ in μm) no2 = 2.7471+0.01878/(λ2 -0.01822)-0.01354λ2

ne2 = 2.37153+0.01224/(λ2 -0.01667)-0.01516λ2

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, suitable for the manufacture of polarizer, polarization beam displacer, time delay compensator plate and other birefringent device, especially for 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.