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A narrow bandwidth extreme ultra-violet light source for time- and angle-resolved photoemission spectroscopy. 2022

Qinda Guo, and Maciej Dendzik, and Antonija Grubišić-Čabo, and Magnus H Berntsen, and Cong Li, and Wanyu Chen, and Bharti Matta, and Ulrich Starke, and Björn Hessmo, and Jonas Weissenrieder, and Oscar Tjernberg
Department of Applied Physics, KTH Royal Institute of Technology, Hannes Alfvéns väg 12, 114 19 Stockholm, Sweden.

Here, we present a high repetition rate, narrow bandwidth, extreme ultraviolet photon source for time- and angle-resolved photoemission spectroscopy. The narrow bandwidth pulses  meV for photon energies  eV are generated through high harmonic generation using ultra-violet drive pulses with relatively long pulse lengths (461 fs). The high harmonic generation setup employs an annular drive beam in tight focusing geometry at a repetition rate of 250 kHz. Photon energy selection is provided by a series of selectable multilayer bandpass mirrors and thin film filters, thus avoiding any time broadening introduced by single grating monochromators. A two stage optical-parametric amplifier provides < 100 fs tunable pump pulses from 0.65 μm to 9 μm. The narrow bandwidth performance of the light source is demonstrated through angle-resolved photoemission measurements on a series of quantum materials, including high-temperature superconductor Bi-2212, WSe2, and graphene.

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