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arXiv 1806.05071physics.optics
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三梳光谱学

Tri-comb spectroscopy

Bachana Lomsadze, Brad. C. Smith, Steven T. Cundiff

摘要:

多维相干光谱(MDCS)1,2是一种强大的光谱学方法,已成为研究各种系统中超快动力学的重要工具。它是多维核磁共振光谱的光学模拟,能够测量非均匀加宽系统中的均匀线宽、多体相互作用以及激发共振之间的耦合,所有这些都不能通过任何其他线性或非线性方法同时获得。MDCS的当前实现需要庞大的设备,并且受到分辨率和采集速度的限制,这限制了它们在实验室之外的应用3 - 5。在这里,我们提出并证明了一种方法,利用三个频率梳略有不同的重复率的非线性相干光谱。与传统的非线性方法不同,三梳光谱仅使用单个光电探测器,没有机械移动元件,以实现更快的采集时间,同时还提供梳分辨率。作为概念证明,仅使用365 ms的数据生成具有梳状交叉对角分辨率的多维相干谱。这些改进使得多维相干光谱与具有窄共振的系统(特别是冷原子和分子系统)相关。此外,该方法具有潜在的化学传感应用领域部署。

英文摘要:

Multi-dimensional coherent spectroscopy (MDCS)1,2 is a powerful method for optical spectroscopy that has become an important tool for studying ultrafast dynamics in a wide range of systems. It is an optical analog of multidimensional nuclear magnetic resonance spectroscopy that enables the measurement of homogeneous linewidths in inhomogeneously broadened systems, many-body interactions, and coupling between excited resonances, all of which are not simultaneously accessible by any other linear or non-linear method. Current implementations of MDCS require a bulky apparatus and suffer from resolution and acquisition speed limitations that constrain their applications outside the laboratory3-5. Here we propose and demonstrate an approach to nonlinear coherent spectroscopy that utilizes three frequency combs with slightly different repetition rates. Unlike traditional nonlinear methods, tri-comb spectroscopy uses only a single photodetector and no mechanical moving elements to enable faster acquisition times, while also providing comb resolution. As a proof of concept, a multidimensional coherent spectrum with comb cross-diagonal resolution is generated using only 365 ms of data. These improvements make multidimensional coherent spectroscopy relevant for systems with narrow resonances (especially cold atomic and molecular systems). In addition the method has the potential to be field deployable for chemical sensing applications.

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