One of the best nonlinear optical crystals is β-barium borate (β-BaB2O4, also known as β-BBO), which combines high nonlinear optical coefficients with low group velocity dispersion, a high damage threshold throughout a broad transparency range (189 - 3500 nm), and many other exceptional properties. As a result, BBO presents a desirable option for a number of nonlinear optical applications. The most crucial SHG crystal for Ti:Sapphire lasers is BBO. BBO flakes can be as thin as 5 µm because to their excellent mechanical strength, making them perfect for ultrashort pulse systems.
Alfa Chemistry offers its customers a broad portfolio of β-BBO crystals, a negative uniaxial crystal. Over practically its entire transparency range, it offers phase matching for various second-order interactions. A few millimeter thick crystal samples were used for the transmittance experiments, which revealed that the transparency ranged from 185 nm to 3.3 µm.
In the UV, visible, and NIR spectrums, it is frequently utilized for nonlinear frequency conversion. For NIR optical parametric chirped pulse amplifiers, BBO crystals are the most important nonlinear crystals. However, they currently only produce a small number of photoperiodic pulses with high average and ultra-high peak power.
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