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"Investigation of two-beam-pumped
noncollinear optical parametric Daniel Herrmann, Raphael Tautz, Franz Tavella, Ferenc Krausz, and Laszlo Veiszchirped-pulse amplification for the generation of few-cycle light pulses" Optics Express Vol. 18, Iss. 5, pp. 4170–4183 (2010) Abstract: We demonstrate a new and compact f-plane-pumped noncollinear optical parametric chirped-pulse amplification (NOPCPA) scheme for broadband pulse amplification, which is based on two-beam-pumping(TBP) at 532 nm. We employ type-I phase-matching in a 5 mm long BBO crystal with moderate pump intensities to preserve the temporal pulse contrast. Amplification and compression of the signal pulse from 675 nm - 970 nm is demonstrated, which results in the generation of 7.1-fs light pulses containing 0.35 mJ energy. In this context, we investigate the pump-to-signal energy conversion efficiency for TBP-NOPCPA and outline details for few-cycle pulse characterization. Furthermore, it is verified, that the interference at the intersection of the two pump beams does not degrade the signal beam spatial profile. It is theoretically shown that the accumulated OPA phase partially compensates for wave-vector mismatch and leads to extended broadband amplification. The experimental outcome is supported by numerical split-step simulations of the parametric signal gain, including pump depletion and parametric fluorescence. This publication has not been written at BMO BMO authors (in alphabetic order): Daniel Herrmann Assoziierte Projekte: Generation of light pulses on the time scale of 5 fs |