BETA BARIUM BORATE β-BaB2O4 (BBO)

Chemical formula: β-BaB₂O₄
Symmetry: 3m
Density (g/cm³): 3.85
Mohs hardness: 5
Transparency range (μm): 0.189 – 2.6
Optical damage threshold (GW/cm²): 1-2 (1064 nm, 10 ns)
Refractive index: n_o – 1.6750, n_e – 1.5555 (532 nm)
Nonlinear coefficients (pm/V): d₁₅ = 0.16, d₂₂ = 2.2

Surface quality: 30/20 (scratch/dig)
Flatness: λ/6 (546 nm)
Parallelism: < 40”