An efficient high-current circuit for fast radio-frequency spectroscopy in cold atomic gases
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arXiv
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| Format: | Preprint |
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2021
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| author | Scazza, F. Del Pace, G. Pieri, L. Concas, R. Kwon, W. J. Roati, G. |
| author_facet | Scazza, F. Del Pace, G. Pieri, L. Concas, R. Kwon, W. J. Roati, G. |
| contents | We design and implement a low-impedance, high-current radio-frequency (RF) circuit, enabling fast coherent coupling between magnetic levels in cold alkali atomic samples. It is based on a compact shape-optimized coil that maximizes the RF field coupling with the atomic magnetic dipole, and on coaxial transmission-line transformers that step up the field-generating current flowing in the coil by a factor $\sim\,4$ to about $7.5\,$A for $100\,$W of RF driving. This allows to obtain a RF coupling field of about $0.035\,\text{G}/\sqrt{\text{W}}$ at the atomic sample location. The system is robust and versatile, as it generates a large RF field without compromising on the available optical access, and its central resonant frequency can be adjusted in situ. Our approach provides a cost-effective, reliable solution, featuring a negligible level of interference with surrounding electronic equipment thanks to its symmetric layout. We test the circuit performance using a maximum RF power of $80\,$W at a frequency around $82\,$MHz, which corresponds to a measured Rabi frequency $Ω_R/2π\simeq 18.5\,$kHz, i.e. a $π$-pulse duration of about $27\,μ$s, between two of the lowest states of ${}^6$Li at an offset magnetic field of $770\,$G. Our solution can be readily adapted to other atomic species and vacuum chamber designs, in view of an increasing modularity of cold atom experiments. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2104_12730 |
| institution | arXiv |
| publishDate | 2021 |
| record_format | arxiv |
| spellingShingle | An efficient high-current circuit for fast radio-frequency spectroscopy in cold atomic gases Scazza, F. Del Pace, G. Pieri, L. Concas, R. Kwon, W. J. Roati, G. Atomic Physics Quantum Gases Instrumentation and Detectors We design and implement a low-impedance, high-current radio-frequency (RF) circuit, enabling fast coherent coupling between magnetic levels in cold alkali atomic samples. It is based on a compact shape-optimized coil that maximizes the RF field coupling with the atomic magnetic dipole, and on coaxial transmission-line transformers that step up the field-generating current flowing in the coil by a factor $\sim\,4$ to about $7.5\,$A for $100\,$W of RF driving. This allows to obtain a RF coupling field of about $0.035\,\text{G}/\sqrt{\text{W}}$ at the atomic sample location. The system is robust and versatile, as it generates a large RF field without compromising on the available optical access, and its central resonant frequency can be adjusted in situ. Our approach provides a cost-effective, reliable solution, featuring a negligible level of interference with surrounding electronic equipment thanks to its symmetric layout. We test the circuit performance using a maximum RF power of $80\,$W at a frequency around $82\,$MHz, which corresponds to a measured Rabi frequency $Ω_R/2π\simeq 18.5\,$kHz, i.e. a $π$-pulse duration of about $27\,μ$s, between two of the lowest states of ${}^6$Li at an offset magnetic field of $770\,$G. Our solution can be readily adapted to other atomic species and vacuum chamber designs, in view of an increasing modularity of cold atom experiments. |
| title | An efficient high-current circuit for fast radio-frequency spectroscopy in cold atomic gases |
| topic | Atomic Physics Quantum Gases Instrumentation and Detectors |
| url | https://arxiv.org/abs/2104.12730 |