2013/12/07 by Eric Gentry, Gentry, Eric S.
Physics and Astronomy · #Astrophysics of Galaxies (astro-ph.GA) #Cold Atom Physics and Bose-Einstein Condensates #FOS: Physical sciences #Superconducting and THz Device Technology
paper · pdf · doi:10.48550/arxiv.1312.2105
openalex publication_date 2013/12/07 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
In this paper we will look at the phenomenon of Microwave Amplification by Stimulated Emission of Radiation (a maser system). We begin by deriving amplification by stimulated emission using time-dependent perturbation theory, in which the perturbation provided by external radiation. When this perturbation is applied to an ensemble of particles exhibiting a population inversion, the result is stimulated microwave radiation. We will explore both unsaturated and saturated masers and compare their properties. By understanding their gain, as well as the effect of line broadening, astronomers are to identify astrophysical masers. By studying such masers, we gain new insight into poorly understood physical environments, particularly those around young and old stars, and compact stellar bodies.