Currently, there is great interest in laser cooling of barium monofluoride (BaF) molecules for precision tests of fundamental symmetries. We use high-resolution absorption spectroscopy to characterize several as yet imprecisely known transition frequencies required to realize such cooling. We extract an improved set of molecular constants for the bosonic $^138Ba^19F$ and $^136Ba^19F$ isotopologues, confirm the existence of a significant hyperfine splitting in the excited state of the laser cooling cycle, and investigate the effects of this splitting on the achievable cooling forces. As a direct application of our spectroscopic insights, we experimentally demonstrate nearly background-free fluorescence imaging of a BaF molecular beam in a glass cell vacuum chamber. We expect such high-fidelity detection to be useful for various types of precision measurement scenarios.
%0 Journal Article
%1 PhysRevA.108.062812
%A Rockenhäuser, Marian
%A Kogel, Felix
%A Pultinevicius, Einius
%A Langen, Tim
%D 2023
%I American Physical Society
%J Phys. Rev. A
%K ColdMolecules myown pi5
%N 6
%P 062812
%R 10.1103/PhysRevA.108.062812
%T Absorption spectroscopy for laser cooling and high-fidelity detection of barium monofluoride molecules
%U https://link.aps.org/doi/10.1103/PhysRevA.108.062812
%V 108
%X Currently, there is great interest in laser cooling of barium monofluoride (BaF) molecules for precision tests of fundamental symmetries. We use high-resolution absorption spectroscopy to characterize several as yet imprecisely known transition frequencies required to realize such cooling. We extract an improved set of molecular constants for the bosonic $^138Ba^19F$ and $^136Ba^19F$ isotopologues, confirm the existence of a significant hyperfine splitting in the excited state of the laser cooling cycle, and investigate the effects of this splitting on the achievable cooling forces. As a direct application of our spectroscopic insights, we experimentally demonstrate nearly background-free fluorescence imaging of a BaF molecular beam in a glass cell vacuum chamber. We expect such high-fidelity detection to be useful for various types of precision measurement scenarios.
@article{PhysRevA.108.062812,
abstract = {Currently, there is great interest in laser cooling of barium monofluoride (BaF) molecules for precision tests of fundamental symmetries. We use high-resolution absorption spectroscopy to characterize several as yet imprecisely known transition frequencies required to realize such cooling. We extract an improved set of molecular constants for the bosonic $^{138}\mathrm{Ba}^{19}\mathrm{F}$ and $^{136}\mathrm{Ba}^{19}\mathrm{F}$ isotopologues, confirm the existence of a significant hyperfine splitting in the excited state of the laser cooling cycle, and investigate the effects of this splitting on the achievable cooling forces. As a direct application of our spectroscopic insights, we experimentally demonstrate nearly background-free fluorescence imaging of a BaF molecular beam in a glass cell vacuum chamber. We expect such high-fidelity detection to be useful for various types of precision measurement scenarios.},
added-at = {2023-12-18T09:29:16.000+0100},
author = {Rockenh\"auser, Marian and Kogel, Felix and Pultinevicius, Einius and Langen, Tim},
biburl = {https://puma.ub.uni-stuttgart.de/bibtex/234a7b88d27be9f670ae23f38d50ed527/pi5},
doi = {10.1103/PhysRevA.108.062812},
interhash = {808812cb0924b59e5859229d28dd6e91},
intrahash = {34a7b88d27be9f670ae23f38d50ed527},
journal = {Phys. Rev. A},
keywords = {ColdMolecules myown pi5},
month = dec,
number = 6,
numpages = {10},
pages = 062812,
publisher = {American Physical Society},
timestamp = {2023-12-18T09:29:16.000+0100},
title = {Absorption spectroscopy for laser cooling and high-fidelity detection of barium monofluoride molecules},
url = {https://link.aps.org/doi/10.1103/PhysRevA.108.062812},
volume = 108,
year = 2023
}