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

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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Cited by in corpus (4)

• Time- and Angle-Resolved Photoemission Studies of Quantum Materials
• Monochromatic high-harmonic generation by Bessel-Gauss beam in periodically modulated media
• Electron-phonon-dominated charge-density-wave fluctuations in TiSe${}_2$ accessed by ultrafast nonequilibrium dynamics
• Dielectric Screening in Electromagnetic Dressing of Semiconductors