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Time-resolved photoemission apparatus achieving sub-20-meV energy resolution and high stability

机译:时间分辨的光发射装置,实现低于20meV的能量分辨率和高稳定性

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The paper describes a time- and angle-resolved photoemission apparatus consisting of a hemispherical analyzer and a pulsed laser source. We demonstrate 1.48-eV pump and 5.92-eV probe measurements at the ⩾10.5-meV and ⩾240-fs resolutions by use of fairly monochromatic 170-fs pulses delivered from a regeneratively amplified Ti:sapphire laser system operating typically at 250 kHz. The apparatus is capable to resolve the optically filled superconducting peak in the unoccupied states of a cuprate superconductor, BiSrCaCuO. A dataset recorded on Bi(111) surface is also presented. Technical descriptions include the followings: A simple procedure to fine-tune the spatio-temporal overlap of the pump-and-probe beams and their diameters; achieving a long-term stability of the system that enables a normalization-free dataset acquisition; changing the repetition rate by utilizing acoustic optical modulator and frequency-division circuit.
机译:该论文描述了一种由半球分析仪和脉冲激光源组成的时间分辨和角度分辨的光发射设备。我们通过使用通常在250 kHz下工作的可再生放大的Ti:蓝宝石激光系统发出的相当单色的170 fs脉冲,在⩾10.5-meV和⩾240-fs分辨率下演示了1.48 eV泵浦和5.92 ev探头测量。该装置能够在铜酸盐超导体BiSrCaCuO的未占据状态下解析光学填充的超导峰。还介绍了Bi(111)表面上记录的数据集。技术说明包括以下内容:一种用于微调泵浦和探测光束的时空重叠及其直径的简单过程;实现系统的长期稳定性,实现无规范化数据集的获取;利用声光调制器和分频电路改变重复率。

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