= Jean Dalibard
{c}
{tag=Physicist}
{wiki}
= J. Dalibard
{c}
{synonym}
<Jean Dalibard> developed, with <Claude Cohen-Tannoudji>, models explaining <laser cooling> below the simple <Doppler cooling limit>. Spatially changing <wave polarization> makes the light shifts of atomic sublevels vary with <position>.
In <Sisyphus cooling>, moving <chemical atoms> climb a light-shift potential and are optically pumped into a lower-energy sublevel. Repeating that sequence removes kinetic <energy>. The mechanism depends on internal-state structure and optical pumping, explaining why a two-level Doppler model misses the additional cooling.<Laser cooling below the Doppler limit by polarization gradients: simple theoretical models by Jean Dalibard and Claude Cohen-Tannoudji>[Models of polarization-gradient cooling and delayed optical pumping]{ref}
\Image[https://commons.wikimedia.org/wiki/Special:Redirect/file/Jean_Dalibard_(cropped).jpg?width=260]
{title=Portrait of <Jean Dalibard>}
{description=© Barande Jérémy /EP. (Ecole polytechnique). https://creativecommons.org/licenses/by-sa/2.0/[CC BY-SA 2.0], via Wikimedia Commons.}
{source=https://commons.wikimedia.org/wiki/File:Jean_Dalibard_(cropped).jpg}
{width=260}
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