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A narrow bandwidth extreme ultra-violet light source for time- and angle-resolved photoemission spectroscopy
oleh: Qinda Guo, Maciej Dendzik, Antonija Grubišić-Čabo, Magnus H. Berntsen, Cong Li, Wanyu Chen, Bharti Matta, Ulrich Starke, Björn Hessmo, Jonas Weissenrieder, Oscar Tjernberg
Format: | Article |
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Diterbitkan: | AIP Publishing LLC and ACA 2022-03-01 |
Deskripsi
Here, we present a high repetition rate, narrow bandwidth, extreme ultraviolet photon source for time- and angle-resolved photoemission spectroscopy. The narrow bandwidth pulses Δ E = 9 , 14 , and 18 meV for photon energies h ν = 10.8 , 18.1 , and 25.3 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.