Seminars

# PIER Photon Science Colloquium: From Masers and Lasers to Phasers and Qasers

## by Marlan O. Scully (Texas A&M University, Texas, USA; Princeton University, USA; Baylor University, USA)

Friday, October 11, 2013 from to (Europe/Berlin)
at DESY Hamburg ( CFEL, Bldg. 99 )
 Description Lasers and masers typically require population inversion. But with phase coherent atoms (phasers), we get lasing without inversion (e.g., 10% of the atoms excited). Now we find that it is possible to get coherent light emitted with no atoms excited, via Quantum Amplification of Superradiant Emission of Radiation (QASER).