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

IF 2.3 2区物理与天体物理 Q3 CHEMISTRY, PHYSICAL Structural Dynamics-Us Pub Date : 2022-04-28 eCollection Date: 2022-03-01 DOI:10.1063/4.0000149

Qinda Guo, Maciej Dendzik, Antonija Grubišić-Čabo, Magnus H Berntsen, Cong Li, Wanyu Chen, Bharti Matta, Ulrich Starke, Björn Hessmo, Jonas Weissenrieder, Oscar Tjernberg

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Abstract

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.

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用于时间和角度分辨光发射光谱的窄带宽极紫外光源

在这里，我们提出了一个高重复率，窄带宽，极紫外光子源的时间和角度分辨光发射光谱。光子能量hν=10.8、18.1和25.3 eV时，利用脉冲长度较长(461 fs)的紫外驱动脉冲，通过高谐波产生ΔE=9、14和18 meV的窄带宽脉冲。高谐波产生装置采用紧聚焦几何形状的环形驱动波束，重复频率为250 kHz。光子能量选择由一系列可选择的多层带通镜和薄膜滤光片提供，从而避免了单光栅单色器引入的任何时间展宽。两级光参量放大器提供< 100fs的可调泵浦脉冲，范围从0.65 μm到9 μm。通过对一系列量子材料(包括高温超导体Bi-2212、WSe2和石墨烯)的角度分辨光发射测量，证明了光源的窄带宽性能。

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来源期刊

Structural Dynamics-Us CHEMISTRY, PHYSICALPHYSICS, ATOMIC, MOLECU-PHYSICS, ATOMIC, MOLECULAR & CHEMICAL

CiteScore

5.50

自引率

3.60%

发文量

审稿时长

16 weeks

期刊介绍： Structural Dynamics focuses on the recent developments in experimental and theoretical methods and techniques that allow a visualization of the electronic and geometric structural changes in real time of chemical, biological, and condensed-matter systems. The community of scientists and engineers working on structural dynamics in such diverse systems often use similar instrumentation and methods. The journal welcomes articles dealing with fundamental problems of electronic and structural dynamics that are tackled by new methods, such as: Time-resolved X-ray and electron diffraction and scattering, Coherent diffractive imaging, Time-resolved X-ray spectroscopies (absorption, emission, resonant inelastic scattering, etc.), Time-resolved electron energy loss spectroscopy (EELS) and electron microscopy, Time-resolved photoelectron spectroscopies (UPS, XPS, ARPES, etc.), Multidimensional spectroscopies in the infrared, the visible and the ultraviolet, Nonlinear spectroscopies in the VUV, the soft and the hard X-ray domains, Theory and computational methods and algorithms for the analysis and description of structuraldynamics and their associated experimental signals. These new methods are enabled by new instrumentation, such as: X-ray free electron lasers, which provide flux, coherence, and time resolution, New sources of ultrashort electron pulses, New sources of ultrashort vacuum ultraviolet (VUV) to hard X-ray pulses, such as high-harmonic generation (HHG) sources or plasma-based sources, New sources of ultrashort infrared and terahertz (THz) radiation, New detectors for X-rays and electrons, New sample handling and delivery schemes, New computational capabilities.