= Jean Brossel
{c}
{tag=Physicist}
{title2=1918–2003}
{wiki}
= J. Brossel
{c}
{synonym}
<Jean Brossel> and <Alfred Kastler> developed optical preparation and detection of atomic <magnetic resonance>. Selectively absorbed <light> creates unequal populations among <Zeeman sublevels>; a <radio frequency> transition redistributes those populations. The resulting change in <absorption> or <fluorescence> supplies a visible signal of the resonance. The <light> thus has two distinct jobs: <optical pumping> prepares the initial <quantum state> distribution, while optical detection reads out the effect of a much weaker magnetic excitation.<Création optique d’une inégalité de population entre les sous-niveaux Zeeman de l’état fondamental des atomes by Jean Brossel and others>[Population preparation and optical observation of magnetic transitions]{ref}
A <physicist>.<Jean Brossel by Laboratoire Kastler Brossel>[Independent professional profile]{ref}
\Image[https://www.lkb.fr/wp-content/uploads/2024/08/Jean-Brossel-826x1024.jpg]
{title=Portrait of <Jean Brossel>}
{width=240}
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