β-BBO Crystal—a widely used nonlinear crystal for frequency conversion in the ultraviolet, visible and near-infrared

BBO Crystal is a one of the most important nonlinear optical crystals, beta-barium borate (β-BaB2O4,β-BBO) combines many outstanding features such as its high nonlinear optical coefficients, low group-velocity dispersion, broad transparency range (189–3500 nm) and high damage threshold. This unique combination ensures β-BBO crystal a promising candidate for a wide range of nonlinear optical applications such as frequency converters and optical parametric oscillators. In the realm of quantum optics, β-BBO crystal can be used to generate entangled photon pairs and ten-photon entanglement.

BBO nonlinear crystal is a negative uniaxial crystal, which provides phase matching for various second-order interactions almost over its entire transparency range (from 185 nm to 3.3 µm, as deduced from the transmittance measurements using crystal samples of several mm thickness), making it a widely used crystal for nonlinear frequency conversion in the ultraviolet, visible and near-infrared. In that regard, BBO crystal is the most important nonlinear crystal for near infrared optical parametric chirped pulse amplifiers, which currently deliver few optical cycle pulses with high average and ultrahigh peak powers.

1. Wide transmission region from 190 nm to 3500nm

2. Large effective second-harmonic-generation(SHG)coefficient

3. Broad phase-matching range from 409.6 nm to 3500nm

4. Wide temperature-bandwidth of about 55℃

5. High damage threshold of 10 J/cm2 for 100 ps pulse-width at 1064 nm

6. High optical homogeneity with n≈10-6/cm

7. Good mechanical and physical properties

• Electro-optic crystal for Pockels cells
• Harmonic generations (up to fifth) of Nd doped lasers
• Frequency doubling and tripling of ultrashort
• Frequency doubling of Argon ionTi:Sapphire