Logo Logo
Switch Language to German
Lochbrunner, Stefan; Wilhelm, T.; Piel, J.; Spörlein, S.; Riedle, Eberhard ORCID: 0000-0002-2672-5718 (1999): Sub-20-fs tunable pulses in the visible and NIR by noncollinear optical parametric amplification (NOPA). Advanced Solid-State Lasers, 31 January–3 February 1999, Boston, Massachusetts, United States.
Full text not available from 'Open Access LMU'.


Generation of tunable sub-20-fs visible pulses is demonstrated by optical parametric amplification of a white light continuum in a 2 mm thick BBO crystal. The necessary broad amplification bandwidth is ensured by noncollinear type I phase matching. The proper angle between the seed light and the second harmonic of the Ti:sapphire pump light leads to an effective matching of the signal and idler group velocities. Above the degeneracy point this is not possible in the type I arrangement but it is shown that type II phase matching can be used instead to produce similarly short pulses in the NIR.