Amplification of Microwave Radiation by Substances not in Thermal Equilibrium

Bernard Yurke, P. G. Kaminsky, Edward A. Whittaker +3 more

Jiaxin Gong, P. K. Aravind

David Abergel

J. Weber

This paper briefly discusses the possibility of obtaining coherent microwave radiation from crystals and gases. It will be shown that it is possible to obtain coherent microwave radiation by such methods, provided that a certain non equilibrium energy distribution is first produced. Methods are discussed for producing such a distribution. The amount of amplification which can be produced by such methods is very small Tinder ordinary circumstances and does not appear to be able to compete with other methods. The method may have certain special applications.

Karl Friedrich Renk

Yuri V. Rostovtsev

We derive the generation condition of amplification without inversion in three-level atoms driven by the microwave coherent pumping. Analyzing this condition we show the restriction and the possibility of observing the amplification without inversion under initial thermodynamics equilibrium between atoms and thermal radiation field.