%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 }