Frietsch B, Carley R, Döbrich K, Gahl C, Teichmann M, Schwarzkopf O, Wernet Ph, Weinelt M
Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany.
Rev Sci Instrum. 2013 Jul;84(7):075106. doi: 10.1063/1.4812992.
We present a table top setup for time- and angle-resolved photoelectron spectroscopy to investigate band structure dynamics of correlated materials driven far from equilibrium by femtosecond laser pulse excitation. With the electron-phonon equilibration time being in the order of 1-2 ps it is necessary to achieve sub-picosecond time resolution. Few techniques provide both the necessary time and energy resolution to map non-equilibrium states of the band structure. Laser-driven high-order harmonic generation is such a technique. In our experiment, a grating monochromator delivers tunable photon energies up to 40 eV. A photon energy bandwidth of 150 meV and a pulse duration of 100 fs FWHM allow us to cover the k-space necessary to map valence bands at different kz and detect outer core states.
我们展示了一种用于时间分辨和角分辨光电子能谱的桌面装置，以研究由飞秒激光脉冲激发驱动远离平衡态的关联材料的能带结构动力学。由于电子 - 声子平衡时间约为1 - 2皮秒，因此有必要实现亚皮秒时间分辨率。很少有技术能同时提供必要的时间和能量分辨率来绘制能带结构的非平衡态。激光驱动的高次谐波产生就是这样一种技术。在我们的实验中，一个光栅单色仪可提供高达40 eV的可调光子能量。150 meV的光子能量带宽和100 fs FWHM的脉冲持续时间使我们能够覆盖在不同kz处绘制价带并检测外层芯态所需的k空间。
