论文标题
宽带光学二维相干光谱法
Broadband Optical Two-Dimensional Coherent Spectroscopy of a Rubidium Atomic Vapor
论文作者
论文摘要
光学二维相干光谱（2DC）已成为研究能量水平结构，动力学和耦合在内的许多系统中的强大工具。以前已经报道了两种D线（D $ _1 $和D $ _2 $ transitions）的各种类型的二维（2D）光谱，包括所谓的单量子，零值和双量子2D光谱。对于Rubidium（RB），一个主要区别在于，D线相距约15 nm，而不是K的大约3 nm。同时令人兴奋的两个D线RB原子都需要实验更广泛的激光带宽。在这里，我们报告了RB原子蒸气中的宽带光学2DCS实验。获得了一组单量子，零值和双Quantum 2D光谱，包括两个D线RB原子。基于光学BLOCH方程的扰动溶液，通过模拟的2D光谱复制实验光谱。 RB原子中的这项工作补充了先前对K和RB的2DC研究，其带宽较窄，涵盖了两个k的两个d线或仅一个D线RB。宽带激发使两个D线Rb的双量器和多量化2DC能够研究多体相互作用和相关性，并与K原子进行研究。
Optical two-dimensional coherent spectroscopy (2DCS) has become a powerful tool for studying energy level structure, dynamics, and coupling in many systems including atomic ensembles. Various types of two-dimensional (2D) spectra, including the so-called single-quantum, zero-quantum, and double-quantum 2D spectra, of both D lines (D$_1$ and D$_2$ transitions) of potassium (K) atoms have been reported previously. For rubidium (Rb), a major difference is that the D-lines are about 15 nm apart as opposed to only about 3 nm for K. Simultaneously exciting both D-lines of Rb atoms requires a broader laser bandwidth for the experiment. Here, we report a broadband optical 2DCS experiment in an Rb atomic vapor. A complete set of single-quantum, zero-quantum, and double-quantum 2D spectra including both D-lines of Rb atoms were obtained. The experimental spectra were reproduced by simulated 2D spectra based on the perturbation solutions to the optical Bloch equations. This work in Rb atoms complements previous 2DCS studies of K and Rb with a narrower bandwidth that covers two D-lines of K or only a single D-line of Rb. The broadband excitation enables the capability to perform double-quantum and multi-quantum 2DCS of both D-lines of Rb to study many-body interactions and correlations in comparison with K atoms.
