Tuning time and energy resolution in time-resolved photoemission spectroscopy with nonlinear crystals
Tuning time and energy resolution in time-resolved photoemission spectroscopy with nonlinear crystals
复制标题
DOI：
10.1063/5.0018834
复制
发表时间：
2020-09-07
影响因子：
3.2
通讯作者：
Kirchmann, Patrick S.
中科院分区：
文献类型：
--
作者：
Gauthier, Alexandre;Sobota, Jonathan A.;Kirchmann, Patrick S.
时间和角度分辨光电子能谱是一种强有力的探测电子能带结构的平衡。调整时间和能量分辨率以适应特定的科学问题已经成为越来越重要的实验考虑因素。许多仪器使用非线性晶体中的级联倍频来产生所需的紫外探测脉冲。我们演示了如何计算澄清激光带宽和非线性晶体厚度之间的关系，有助于实验分辨率和可实现的时间带宽产品的内在限制。在实验上，我们通过改变非线性β-BaB_2O_4晶体的厚度来调节频率上转换的时间和能量分辨率，提供了灵活的实验设计。我们实现了58-103 fs的时间分辨率和相应的55-27 meV的能量分辨率。我们提出了一种方法来选择晶体厚度的基础上所需的实验分辨率。由AIP Publishing授权出版。
Time- and angle-resolved photoemission spectroscopy is a powerful probe of electronic band structures out of equilibrium. Tuning time and energy resolution to suit a particular scientific question has become an increasingly important experimental consideration. Many instruments use cascaded frequency doubling in nonlinear crystals to generate the required ultraviolet probe pulses. We demonstrate how calculations clarify the relationship between laser bandwidth and nonlinear crystal thickness contributing to experimental resolutions and place intrinsic limits on the achievable time-bandwidth product. Experimentally, we tune time and energy resolution by varying the thickness of nonlinear beta-BaB2O4 crystals for frequency upconversion, providing a flexible experiment design. We achieve time resolutions of 58-103 fs and corresponding energy resolutions of 55-27 meV. We propose a method to select crystal thickness based on desired experimental resolutions. Published under license by AIP Publishing.