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

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...

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Bibliographic Details
Published in:arXiv.org 2023-02
Main Authors: Bu, Wenhao, Zhang, Yuhe, Liang, Qian, Chen, Tao, Yan, Bo
Format: Article
Language:English
Subjects:
Absorption spectroscopy
Barium
Buffers
Laser cooling
Spectrum analysis
Online Access:Get full text
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Summary: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.
ISSN:2331-8422
DOI:10.48550/arxiv.2202.02463