论文标题
时间和角度分辨的光发射光谱，探针光子能量高达6.7 eV
A time- and angle-resolved photoemission spectroscopy with probe photon energy up to 6.7 eV
论文作者
论文摘要
我们介绍了基于基于YB的飞秒激光器和半球电子分析仪的时间和角度分辨光发射光谱的发展。泵光子的能量在1.4和1.9 eV之间可调，脉冲持续时间约为30 fs。我们使用kbe $ _2 $ bo $ _3 $ f $ _2 $非线性光学晶体来生成探针脉冲，其中光子能量为6.7 ev，并获得1 ps的总体时间分辨率，并分辨率为18 MeV。此外，$β$ -BAB $ _2 $ o $ _4 $ crystals用于生成6.05 eV的替代探针脉冲，总体时间分辨率为130 fs，能量分辨率为19 MeV。我们用几个样本的代表性数据说明了系统的性能（bi $ _2 $ se $ _3 $，ybcd $ _2 $ _2 $ sb $ _2 $，fESE）。
We present the development of a time- and angle-resolved photoemission spectroscopy based on a Yb-based femtosecond laser and a hemispherical electron analyzer. The energy of the pump photon is tunable between 1.4 and 1.9 eV, and the pulse duration is around 30 fs. We use a KBe$_2$BO$_3$F$_2$ non-linear optical crystal to generate probe pulses, of which the photon energy is up to 6.7 eV, and obtain an overall time resolution of 1 ps and energy resolution of 18 meV. In addition, $β$-BaB$_2$O$_4$ crystals are used to generate alternative probe pulses at 6.05 eV, giving an overall time resolution of 130 fs and energy resolution of 19 meV. We illustrate the performance of the system with representative data on several samples (Bi$_2$Se$_3$, YbCd$_2$Sb$_2$, FeSe).
