Saturated absorption spectroscopy of buffer-gas-cooled Barium monofluoride molecules

Abstract

We report an experimental investigation on the Doppler-free saturated absorption spectroscopy of buffer-gas-cooled Barium monofluoride (BaF) molecules in a 4~K cryogenic cell. The obtained spectra with a resolution of 19~MHz, much smaller than previously observed in absorption spectroscopy, clearly resolve the hyperfine transitions. Moreover, we use these high-resolution spectra to fit the hyperfine splittings of excited $A(v=0)$ state and find the hyperfine splitting of the laser-cooling-relevant $A^2{\Pi }_{1/2}(v=0,J=1/2,+)$ state is about 18 MHz, much higher than the previous theoretically predicted value. This provides important missing information for laser cooling of BaF molecules.

6 pages, 3 figures

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Cited by in corpus (10)

• Three-dimensional Magneto-optical Trapping of Barium Monofluoride
• Absorption spectroscopy for laser cooling and high-fidelity detection of barium monofluoride molecules
• Laser cooling of barium monofluoride molecules using synthesized optical spectra
• Nuclear spin relaxation in cold atom-molecule collisions
• Hyperfine structure of the ${\mathbf{A}}^1\mathbf{\Pi }$ state of AlCl and its relevance to laser cooling and trapping
• Molecular laser cooling using serrodynes: Implementation, characterization and prospects
• Magnetic hyperfine structure constants of ${}^{137}$BaF in the ${}^2{\Pi }_{1/2}$ and ${}^2{\Pi }_{3/2}$ excited states
• High-resolution spectroscopy of barium monofluoride: Odd isotopologues, hyperfine structure and isotope shifts
• Global isotopic analysis of hyperfine-resolved rotational spectroscopic data for barium monofluoride, BaF
• Optical pumping and laser slowing of a heavy molecule