Resonance Raman optical cycling for high-fidelity fluorescence detection of molecules
Resonance Raman optical cycling for high-fidelity fluorescence detection of molecules
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DOI：
10.1103/physrevresearch.3.l042041
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发表时间：
2021-08
影响因子：
4.2
通讯作者：
J. Shaw;J. Schnaubelt;D. McCarron
中科院分区：
文献类型：
--
作者：
J. Shaw;J. Schnaubelt;D. McCarron
我们提出并演示了一种新技术，它将分子中的拉曼散射和光学循环与对角弗兰克-康登因子相结合。这种共振拉曼光学循环操纵分子表现得像高效的荧光团，具有离散的吸收和发射曲线，很容易分离，以便在高背景光环境中进行灵敏的荧光检测。使用我们的测试物种 SrF 的分子束，我们实现了每个分子平均自发发射的光子数高达 $\approx20$，受相互作用时间的限制，同时使用带通滤波器将检测到的散射激光抑制 $\sim10^{6}$。这种通用技术是在任何环境下对分子进行高保真荧光检测的强大工具，特别适合分子激光冷却和捕获实验。
We propose and demonstrate a novel technique that combines Raman scattering and optical cycling in molecules with diagonal Franck-Condon factors. This resonance Raman optical cycling manipulates molecules to behave like efficient fluorophores with discrete absorption and emission profiles that are readily separated for sensitive fluorescence detection in high background light environments. Using a molecular beam of our test species, SrF, we realize up to an average of $\approx20$ spontaneously emitted photons per molecule, limited by the interaction time, while using a bandpass filter to suppress detected scattered laser light by $\sim10^{6}$. This general technique represents a powerful tool for high-fidelity fluorescence detection of molecules in any setting and is particularly well-suited to molecular laser cooling and trapping experiments.