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BBO Your Are Here: Home > Products>Non-Linear Optical Crystals>BBO Beta-Barium Borate,β-BaB2O4,BBO The main advantages of BBO: ? Broad phase matching second-harmonic-generation (SHG) range from 409.6nm to 3500nm ? Wide transmission region from 190nm to 3500nm ? Large effective SHG coefficient ? High damage threshold of 10 GW/cm2 for 100 ps pulse-widths at 1064nm ? High optical homogeneity with Dn 10-6/cm2 ? Wide temperature bandwidth of about 55° (for type I SHG 1064nm) ? Good mechanical and physical properties The main application of BBO crystals: ? Second, third, fourth and fifth harmonic generation of Nd:YAG ? Frequency-doubling, -tripling and -mixing of dye lasers ? Optical parametric amplifiers (OPA) and optical parametric oscillators (OPO) ? Second, third, fourth and fifth harmonic generation of Ti: sapphire and alexandrite ? Frequency-doubling of Argon ions, Cu vapor and ruby lasers ? External intra-cavity SHG HG provides: ? The most advanced technical support ? The most competitive price and quality discounts ? Adequate stock ? Quick delivery within 2 weeks The main properties of BBO crystals: BBO is a negative uniaxial crystal, and its o-ray refractive coefficient (no) is higher than that of the e-ray (ne) which can be calculated by Selleimer equation (λ in μm): no2 = 2.7359 +0.01878 / (λ2-0.01822) -0.01354 λ2 ne2 = 2.3753 +0.01224 / (λ2-0.01667) -0.01516 λ2 BBO crystal in the Nd:YAG lasers: BBO is an efficient NLO crystal for the second, third and fourth harmonic generation of Nd:YAG lasers, and the best NLO crystal for the fifth harmonic generation at 213nm. Conversion efficiency more than 70% for SHG, 60% for THG, 50% for 4HG, and 200mw output at 213nm have been obtained, respectively. Besides, BBO is also an efficient crystal for the intra- cavity SHG of high power Nd:YAG lasers. HG’s warranty on BBO specification: * Wavefront distortion: less than λ / 8 @ 633nm * Dimension tolerance: (W ± 0.1mm) x (H ± 0.1mm) x (L ± 0.2mm/-0.1mm) * Aperture:> 90% central diameter * Flatness: λ / 8 @ 633nm * Finish: 10 / 5 to MIL-PRF-13830B * Parallelism: better than 20 seconds * Verticality: 5 minutes * Angle deviation: △ θ ≤ ± 0.25 °, △ φ ≤ ± 0.25 ° * Quality guarantee period: one year of normal use