Hannover 2020 – scientific programme

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A: Fachverband Atomphysik

A 26: Interaction with VUV and X-ray light II

A 26.4: Talk

Thursday, March 12, 2020, 15:15–15:30, f107

Spectral Compression of XUV Radiation by Four-Wave-Mixing — •Lorenz Drescher, Vishal Shokeen, Tobias Witting, Oleg Kornilov, Marc Vrakking, and Bernd Schütte — Max-Born-Institut für nichtlineare Optik und Kurzzeitspektroskopie, Berlin, Germany

We present and demonstrate a novel concept for the efficient generation of narrowband extreme ultra-violet (XUV) radiation that is based on the conversion of broadband attosecond pulse trains and few-cycle NIR pulses via a four-wave mixing process. Spectral compression of broadband XUV radiation is achieved by exploiting the steep gradient of the frequency-dependent refractive index between two closely spaced resonances, while the nearly flat dispersion in the incident vacuum ultra-violet (VUV) and XUV regimes allows for broadband phase-matching. We demonstrate the concept by propagating XUV pulses created by high-harmonic generation through a dense krypton gas jet and observe a narrow emission peak in between the Kr 4d and 6s resonances. The non-resonant nature and generality of the reported process offers new opportunities for tailoring the spectral bandwidth of XUV beams.