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arXiv · 2205.04705

Ultrafast Polarization-Tunable Monochromatic Extreme Ultraviolet Source at High-Repetition-Rate

Antoine Comby·Debobrata Rajak·Dominique Descamps·Stéphane Petit·Valérie Blanchet·Yann Mairesse·Jérome Gaudin·Samuel Beaulieu
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Abstract

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$\times$10$^{12}$ photons/s at 21.6 eV (up to 4$\times$10$^{11}$ photons/s on target) with ellipticities as high as 90$\%$.

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Antoine Comby, Debobrata Rajak, Dominique Descamps, Stéphane Petit, Valérie Blanchet, Yann Mairesse, Jérome Gaudin, Samuel Beaulieu. 2022-05-10. Ultrafast Polarization-Tunable Monochromatic Extreme Ultraviolet Source at High-Repetition-Rate. https://doi.org/10.1088/2040-8986%2Fac7a49

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