论文标题
使用非线性晶体的时间分辨光发射光谱中的调整时间和能量分辨率
Tuning time and energy resolution in time-resolved photoemission spectroscopy with nonlinear crystals
论文作者
论文摘要
时间和角度分辨光发射光谱是对平衡的电子带结构的强大探针。调整适合特定科学问题的时间和能量解决方案已成为越来越重要的实验考虑。许多仪器在非线性晶体中使用级联的频率加倍来生成所需的紫外探针脉冲。我们证明了计算如何阐明激光带宽与非线性晶体厚度之间的关系，这些晶体厚度有助于实验分辨率，并在可实现的时带宽度产物上置于内在限制。在实验上，我们通过改变非线性$β$ -BAB $ _2 $ o $ o $ _4 $ crystals的频率上转换的厚度来调整时间和能量分辨率，从而为灵活的实验设计提供了。我们达到了58至103 FS的时间分辨率，相应的能源分辨率为55至27 MEV。
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 $β$-BaB$_2$O$_4$ crystals for frequency up-conversion, providing for a flexible experiment design. We achieve time resolutions of 58 to 103 fs and corresponding energy resolutions of 55 to 27 meV.
