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- W2000561118 abstract "A theoretical model is developed for the behavior of an optical maser medium in a static magnetic field of arbitrary strength in the $Z$ direction and an electromagnetic field which is composed of traveling waves with both states of polarization and with both $+z$ and $ensuremath{-}z$ directions. An integral formulation of a truncated phenomenological density matrix is introduced to treat the degeneracy of the atomic energy levels within the natural width. This integral is an exact solution of the phenomenological differential equation for the density matrix which was introduced by Wilcox and Lamb. The inherent degeneracy in the electromagnetic field is included by treating the field in a classical manner. The integral formulation is iterated to yield the first- and third-order contributions to the electric polarization vector P in a spatial element $dmathrm{r}$, and the electric field and the electric polarization are made self-consistent in this spatial element by using coefficients in Maxwell's equations which are slowly varying functions of position and time. Atomic motion, hyperfine, isotope, and other line-broadening effects are included in the polarization vector P. The general linear-amplifier, linear-oscillator, and closed-path-oscillator or photon-rate-gyroscope problems are formulated and in the simplest case require the analysis of eight nonlinear equations. These reduce to four equations for the linear oscillator with an axial magnetic field, and these examples are discussed in detail and compared with experiment. An anomalous situation arises for the ${j}_{a}={j}_{b}$ or ${F}_{a}={F}_{b}$ linear amplifiers or linear-oscillator masers, and the development indicates that these systems are stable near line center only for either right or left circular polarization in zero or weak magnetic fields. A magnetic field dip near line center is discussed. Special examples which require four or fewer nonlinear equations are discussed." @default.
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- W2000561118 date "1965-11-15" @default.
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- W2000561118 title "Theory of Magnetic Effects in Optical Maser Amplifiers and Oscillators" @default.
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- W2000561118 doi "https://doi.org/10.1103/physrev.140.a1088" @default.
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