Abstract
Femtosecond pulses at λ=264 nm were used to measure the two-photon absorption (TPA) coefficient in β-BaB 2O 4 (BBO) crystal. It was found that nonlinear absorption in BBO depends significantly on crystal cut and/or beam polarization. For an ordinary beam propagating along the optical axis (∥ c) and perpendicular to it (⊥ c) the similar values of TPA coefficient were obtained, namely (68±6)×10 −11 and (66±7)×10 −11 cm/W. For an extraordinary beam (⊥ c) the TPA coefficient is significantly smaller, (47±5)×10 −11 cm/W.
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