2D transverse laser cooling of a hexapole focused beam of cold BaF molecules
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arXiv
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| Auteurs principaux: | , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866916809056190464 |
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| author | van Hofslot, Joost W. F. Thompson, Izabella E. Touwen, Anno Balasubramanian, Nithesh Bause, Roman Bethlem, Hendrick L. Borschevsky, Anastasia Fikkers, Ties H. Hoekstra, Steven Jones, Steven A. Levenga, Jelmer E. J. Mooij, Maarten C. Mulder, Heleen Nijman, Bastiaan A. Prinsen, Efion H. Schellenberg, Bart J. van Sloten, Lucas Timmermans, Rob G. E. Ubachs, Wim de Vries, Jordy Willmann, Lorenz |
| author_facet | van Hofslot, Joost W. F. Thompson, Izabella E. Touwen, Anno Balasubramanian, Nithesh Bause, Roman Bethlem, Hendrick L. Borschevsky, Anastasia Fikkers, Ties H. Hoekstra, Steven Jones, Steven A. Levenga, Jelmer E. J. Mooij, Maarten C. Mulder, Heleen Nijman, Bastiaan A. Prinsen, Efion H. Schellenberg, Bart J. van Sloten, Lucas Timmermans, Rob G. E. Ubachs, Wim de Vries, Jordy Willmann, Lorenz |
| contents | A cryogenic buffer gas beam, an electrostatic hexapole lens, and 2D transverse Doppler laser cooling are combined to produce a bright beam of barium monofluoride ($^{138}$Ba$^{19}$F) molecules. Experimental results and trajectory simulations are used to study the laser cooling effect as a function of laser detuning, laser power, laser alignment, and interaction time. A scattering rate of 6.1(1.4) $\times 10^{5}$ s$^{-1}$ on the laser cooling transition is obtained; this is $14 \%$ of the expected maximum, which is attributed to limited control of the magnetic field used to remix dark states. Using 3 tuneable lasers with appropriate sidebands and detuning, each molecule scatters approximately 400 photons during 2D laser cooling, limited by the interaction time and scattering rate. Leaks to dark states are less than 10$\%$. The experimental results are used to benchmark the trajectory simulations to predict the achievable flux 3.5 m downstream for a planned $e$EDM experiment. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_19069 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | 2D transverse laser cooling of a hexapole focused beam of cold BaF molecules van Hofslot, Joost W. F. Thompson, Izabella E. Touwen, Anno Balasubramanian, Nithesh Bause, Roman Bethlem, Hendrick L. Borschevsky, Anastasia Fikkers, Ties H. Hoekstra, Steven Jones, Steven A. Levenga, Jelmer E. J. Mooij, Maarten C. Mulder, Heleen Nijman, Bastiaan A. Prinsen, Efion H. Schellenberg, Bart J. van Sloten, Lucas Timmermans, Rob G. E. Ubachs, Wim de Vries, Jordy Willmann, Lorenz Atomic Physics A cryogenic buffer gas beam, an electrostatic hexapole lens, and 2D transverse Doppler laser cooling are combined to produce a bright beam of barium monofluoride ($^{138}$Ba$^{19}$F) molecules. Experimental results and trajectory simulations are used to study the laser cooling effect as a function of laser detuning, laser power, laser alignment, and interaction time. A scattering rate of 6.1(1.4) $\times 10^{5}$ s$^{-1}$ on the laser cooling transition is obtained; this is $14 \%$ of the expected maximum, which is attributed to limited control of the magnetic field used to remix dark states. Using 3 tuneable lasers with appropriate sidebands and detuning, each molecule scatters approximately 400 photons during 2D laser cooling, limited by the interaction time and scattering rate. Leaks to dark states are less than 10$\%$. The experimental results are used to benchmark the trajectory simulations to predict the achievable flux 3.5 m downstream for a planned $e$EDM experiment. |
| title | 2D transverse laser cooling of a hexapole focused beam of cold BaF molecules |
| topic | Atomic Physics |
| url | https://arxiv.org/abs/2506.19069 |