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Lochbrunner, Stefan; Wilhelm, T.; Piel, J.; Spörlein, S. and Riedle, Eberhard ORCID logoORCID: https://orcid.org/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, Boston, Massachusetts, United States, 31 January–3 February 1999. Fejer, M. M.; Injeyan, H. and Keller, U. (eds.) : Trends in Optics and Photonics. Vol. 26, No. TuA4 Optical Society of America. pp. 366-371

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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.

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