Kaufman Emily, Kohler Daniel D, Sunden Kyle F, Wright John C
Opt Lett. 2024 Feb 1;49(3):610-613. doi: 10.1364/OL.511808.
Floquet state spectroscopy is an optical analogue of multiple quantum coherence nuclear magnetic resonance (MQC-NMR). Tunable ultrafast excitation pulses resonantly excite multiple states in a sample to form the Floquet state. The Floquet state emits multiple coherent beams at frequencies and in directions that conserve energy and momenta. The different output beams differ in the time ordering and coherences created by the excitation beams. They correspond to the different methodologies in the NMR family. Isolating a specific beam and monitoring the output intensity as a function of excitation frequencies creates multidimensional spectra containing cross-peaks between coupled states. The frequency range of the multidimensional spectra is limited by phase matching constraints. This paper presents a new, to the best of our knowledge, active phase matching strategy that increases the versatility of multidimensional Floquet state spectroscopy through both longer sample path lengths and larger spectral ranges.
弗洛凯态光谱学是多量子相干核磁共振（MQC-NMR）的光学模拟。可调谐超快激发脉冲共振激发样品中的多个态以形成弗洛凯态。弗洛凯态在守恒能量和动量的频率及方向上发射多个相干光束。不同的输出光束在由激发光束产生的时间排序和相干性方面存在差异。它们对应于核磁共振家族中的不同方法。分离特定光束并监测作为激发频率函数的输出强度会产生包含耦合态之间交叉峰的多维光谱。多维光谱的频率范围受相位匹配约束的限制。据我们所知，本文提出了一种新的主动相位匹配策略，该策略通过更长的样品路径长度和更大的光谱范围来提高多维弗洛凯态光谱学的通用性。
