In
atomic physics,
Raman cooling is a sub-recoil cooling technique that allows the cooling of
atoms using optical methods below the limitations of
Doppler cooling, limited by the recoil energy of a photon given to an atom. This scheme can be performed in simple
optical molasses or in molasses where an
optical lattice has been superimposed, which are called respectively free space Raman cooling and Raman side-band cooling. Both techniques make use of
Raman scattering of laser light by the atoms.