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  • Letter
  • Open Access

Resonance Raman optical cycling for high-fidelity fluorescence detection of molecules

J. C. Shaw, J. C. Schnaubelt, and D. J. McCarron*

  • Department of Physics, University of Connecticut, 196A Auditorium Road, Unit 3046, Storrs, Connecticut 06269, USA

  • *daniel.mccarron@uconn.edu

Phys. Rev. Research 3, L042041 – Published 15 December, 2021

DOI: https://doi.org/10.1103/PhysRevResearch.3.L042041

Abstract

We propose and demonstrate a 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 ≈20 spontaneously emitted photons per molecule, limited by the interaction time, while using a bandpass filter to suppress detected scattered laser light by ∼106. This general technique represents a powerful tool for high-fidelity fluorescence detection of molecules and is particularly well suited to molecular laser cooling and trapping experiments.

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