Photons: The Quantized Radiation Field

Wolfgang Cassing

R. A. Ismailov, Alexander Ya. Kazakov

If a two-level atom is in the two-photon resonance with a quantized mode and simultaneously inter-acts with a quasi-resonance classical field, then a photon exchange is observed in this system between the quantized and classical modes. It is demonstrated that such a physical system can serve as a source of squeezed radiation in the quantized mode. The squeezing can be arbitrarily close to unity, while the radiation amplitude can be relatively large. A situation is discussed when N atoms are in the two-photon resonance with a quantized mode and simultaneously interact with a classical field. The phenomenon of exponential superradiation is described when the number of photons in the quantized mode exponentially depends on the number N of atoms.

Alexander Ya. Kazakov

If an atom interacts with a classical field and quantized mode simultaneously, exchange by photons between the different components of the field is possible. Such systems can be exploited in order to generate radiation in the quantized mode and can be considered as a micromaser with optical pumping. The process of generation of the quantized field and the quantum-statistical characteristics of this radiation are under investigation.

Fabrizio Tafuri, C. A. Perroni, G. De Filippis

Jin Au Kong

Radiation fields in moving uniaxial media have been quantized without introducing auxiliary potential functions. Hamiltonian and momentum operators are diagonalized in momentum space and written in terms of annihilation and creation operators of the photon state. It is found that two types of photons corresponding to classical ordinary and extraordinary waves will exist, and they are called ordinary photons and extraordinary photons. Physical interpretations of the various results are discussed.