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We design and implement an efficient high-current radio-frequency (RF)circuit, enabling fast and coherent coupling between magnetic levels in coldalkali atomic samples. It is based on a compact shape-optimized coil thatmaximizes the RF field coupling with the atomic magnetic dipole, and on coaxialtransmission-line transformers that step up the field-generating currentflowing in the coil to about 8 A for 100 W of RF power. The system is robustand versatile, as it generates a large RF field without compromising on theavailable optical access, and its central resonant frequency can be adjusted insitu. Our approach provides a cost-effective, reliable solution, featuring alow level of interference with surrounding electronic equipment thanks to itssymmetric layout. We test the circuit performance using a maximum RF power of80 W at a frequency around 82 MHz, which corresponds to a measured Rabifrequency $\Omega_R/2\pi \simeq 18.5$ kHz, i.e. a $\pi$-pulse duration of about27 $\mu$s, between two of the lowest states of ${}^6$Li at an offset magneticfield of 770 G. Our solution can be readily adapted to other atomic species andvacuum chamber designs, in view of increasing modularity of ultracold atomexperiments.

An efficient high-current circuit for fast radio-frequency spectroscopy in cold atomic gases