This years noble prize for Physics have been awarded to Roy J Glauber and John L Hall of USA and Theodor W Hänsch of Germany.
Glauber : Theoretical description of the behaviour of light particles. (quantum theory of optical coherence)
Hall and Hänsch : Laser-based precision spectroscopy, that is, the determination of the colour of the light of atoms and molecules with extreme precision (optical frequency comb technique).
The Nobel Prize in Physics 2005
The Nobel Prize in Physiology or Medicine 2005