Claude Cohen-Tannoudji

Claude Cohen-Tannoudji was a French physicist at the École normale supérieure in Paris. He was known for his experiments in laser cooling. He first proposed Sisyphus cooling and was the first to show that it is possible to cool far beyond the limit expected by sub-Doppler cooling, below the recoil temperature.
Cohen-Tannoudji shared the 1997 Nobel Prize in Physics with Steven Chu and William Daniel Phillips for research in methods of laser cooling and trapping atoms.