 Jean Dalibard

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.^[ref]

Jean Dalibard is a French physicist known for his contributions to the fields of atomic physics, quantum optics, and condensed matter physics. He has been involved in research related to the manipulation of quantum systems and the study of ultracold atoms. Dalibard's work has helped advance the understanding of phenomena such as Bose-Einstein condensates and quantum gases.