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The article presents the development of a new and innovative experimentalmethod to fully characterize a solenoidal "spin-flip" Zeeman slower (ZS) usinga Quartz Crystal $\mu$-balance (QCM) as a kinetic energy sensor. In thisexperiment, we focus a 447.1 nm laser into a counter-propagating beam ofgadolinium (Gd) atoms in order to drive the dipole transition between ground$^{9}$D$^{0}_{2}$ state and $^{9}$D$_{3}$ excited state. The changes in thevelocity of the beam were measured using a QCM during this process, as a noveland alternative method to characterize the efficiency of a 1 m-long spin-flipZeeman slower. The QCM, normally used in solid-state physics, is continuouslyand carefully monitored to determine the change in its natural frequency ofoscillation. These changes reveal a direct relation with changes in thedeposition rate and the momentum exchanged between the QCM and Gd atoms. Hence,in terms of ultracold atom physics, it might be used to study thetime-evolution of the velocity distribution of the atoms during the coolingprocess. By this method, we obtain a maximum atom average velocity reduction of(43.5 $\pm$ 6.4)$\%$ produced by our apparatus. Moreover, we estimate anexperimental lifetime of $\tau_{e}$ = 8.2 ns for the used electronictransition, and then we compared it with the reported lifetime for 443.06 nmand 451.96 nm electronic transitions of Gd. These results confirm that the QCMoffers an accessible and simple solution to take into account for laser coolingexperiments. Therefore, a novel and innovative technique can be available forfuture experiments.

Continuous slowing of a gadolinium atomic beam