论文标题
狭窄的带宽极端超紫色光源，用于时间和角度分辨光发射光谱
A narrow bandwidth extreme ultra-violet light source for time- and angle-resolved photoemission spectroscopy
论文作者
论文摘要
在这里，我们提出了高重复率，狭窄的带宽，极端紫外线（XUV）光子源，用于时间和角度分辨光发射光谱（TR-ARPES）。狭窄的带宽puls $ΔE= 9、14、18 $ MEV用于光子能量$hν= 10.8、18.1、25.3 $ eV是通过使用超柔胶（HHG）的高柔胶（UV）驱动脉冲的脉冲脉冲（相对较长的脉冲长度（461 fs））生成的。 HHG设置以250 kHz的重复速率以紧密的焦点几何形状采用环形驱动器光束。光子能量选择由一系列可选的多层带通镜和薄膜过滤器提供，从而避免了单个光栅单色器引入的任何时间扩展。两个阶段的光学参数放大器提供$ <100 $ fs可调泵脉冲，从0.65 $ $ m至9 $μ$ m。光源的狭窄带宽性能通过ARPES测量在一系列量子材料上进行了证明，包括高温超导体BIB-2212，WSE $ _2 $和石墨烯。
Here we present a high repetition rate, narrow band-width, extreme ultraviolet (XUV) photon source for time- and angle-resolved photoemission spectroscopy (tr-ARPES). The narrow band width pulses $ΔE=9, 14, 18$ meV for photon energies $hν=10.8, 18.1, 25.3$ eV are generated through High Harmonic Generation (HHG) using ultra-violet (UV) drive pulses with relatively long pulse lengths (461 fs). The HHG setup employs an annuluar drive beam in a 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 $μ$m to 9 $μ$m. The narrow bandwidth performance of the light source is demonstrated through ARPES measurements on a series of quantum materials including the high-temperature superconductor Bi-2212, WSe$_2$ and graphene.
