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A: Fachverband Atomphysik

A 28: Interaction with VUV and X-ray light

A 28.5: Vortrag

Donnerstag, 14. März 2019, 11:30–11:45, S HS 3 Physik

Time-resolved XUV refraction using a gas-phase prism — Lorenz Drescher, Oleg Kornilov, Tobias Witting, Jochen Mikosch, Marc Vrakking, and •Bernd Schütte — Max-Born-Institut, Berlin

Recently, we have demonstrated the first refractive lens and the first refractive prism for XUV beams, which are based on the deflection of XUV radiation in an inhomogeneous atomic jet [1]. These results make it possible to transfer techniques that rely on refraction and that are well established in other spectral regions to the XUV domain.

Here we report on the time-resolved investigation of XUV refraction using a gas-phase prism. A broadband XUV pulse induces electric dipoles in a dense He jet that relax via free induction decay, thereby emitting phase-shifted XUV radiation. A time-delayed NIR pulse is used to perturb the free induction decay, leading to a time-dependent suppression of the refracted XUV signal. This allows us to measure the angle-dependent XUV pulse duration, which we find to increase with increasing deflection angle. The XUV pulse duration can be further controlled by varying the gas backing pressure. Our results demonstrate that gas-phase XUV prisms can be used as monochromators for broadband XUV radiation, enabling the generation of ultrashort XUV pulses with bandwidths ranging from the (sub-)meV level to hundreds of meV. In the future, the combination of gas-phase prisms with pump-probe techniques could be exploited to study and control transient refractive index changes in atoms and molecules in the XUV region.

[1] L. Drescher et al., Nature doi.org/10.1038/s41586-018-0737-3