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Article Dans Une Revue Journal of Optics Année : 2022

Ultrafast polarization-tunable monochromatic extreme ultraviolet source at high-repetition-rate

Résumé

We report on the development of a high-order harmonic generation (HHG)-based ultrafast high-repetition-rate (250 kHz) monochromatic extreme ultraviolet (21.6 eV) source with polarization tunability, specifically designed for multi-modal dichroism in time- and angle-resolved photoemission spectroscopy. Driving HHG using an annular beam allows us to spatially separate the high-power 515 nm driving laser from the XUV beamlet while preserving the linear polarization axis angle tunability. This enables controlling the polarization state of the XUV radiation with a fixed all-reflective phase-shifter. This scheme leads to a source brightness of 5.7 × 10 12 photons s −1 at 21.6 eV (up to 4 × 10 11 photons s −1 on target) with ellipticities as high as 90%.
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Dates et versions

hal-03796672 , version 1 (04-10-2022)

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Antoine Comby, Debobrata Rajak, Dominique Descamps, Stéphane Petit, V. Blanchet, et al.. Ultrafast polarization-tunable monochromatic extreme ultraviolet source at high-repetition-rate. Journal of Optics, 2022, 24 (8), pp.084003. ⟨10.1088/2040-8986/ac7a49⟩. ⟨hal-03796672⟩

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