Abstract

An optical parametric amplification scheme yielding a broad bandwidth in a BBO crystal (Type I) pumped by the third harmonic of a femtosecond Ti:Sapphire laser has been investigated theoretically and experimentally. A broad amplification bandwidth of 205 THz between 346 and 453 nm is obtained in a noncollinear geometry of parametric interaction. The bandwidth of the amplification is reduced significantly when the pump–signal angle is changed by only 0.1°. A UV-extended white-light continuum is used as a signal seed. Several materials for white-light generation – such as CaF 2,MgF 2 and LiF – have been investigated.

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