极端紫外线
光学
角分辨光电子能谱
物理
光谱学
光电发射光谱学
光子
光电子学
光子能量
高次谐波产生
材料科学
激光器
原子物理学
X射线光电子能谱
谱线
核磁共振
量子力学
天文
作者
Qinda Guo,Maciej Dendzik,Antonija Grubišić‐Čabo,Magnus H. Berntsen,Cong Li,Wanyu Chen,Bharti Matta,Ulrich Starke,Björn Hessmo,Jonas Weissenrieder,O. Tjernberg
出处
期刊:Structural Dynamics
[American Institute of Physics]
日期:2022-03-01
卷期号:9 (2): 024304-024304
被引量:20
摘要
Here, we present a high repetition rate, narrow bandwidth, extreme ultraviolet photon source for time- and angle-resolved photoemission spectroscopy. The narrow bandwidth pulses ΔE=9, 14, and 18 meV for photon energies hν=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.
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