Generation of Light by a Scattering Medium with Negative Resonance Absorption

Generation of light by a scattering medium with negative resonance absorption is considered theoretically for the case when the photon mean free path is much smaller than the dimensions of the scattering region. The negative feedback in such a quantum generator is not resonant. The generation threshold of the quantum generator is determined and the dynamics of the establishment of stationary conditions and narrowing of the radiation spectrum are considered. The limiting width of the radiation spectrum under generation conditions, due to fluctuation motion of the scattering particles, is found. The use of such a quantum generator as a source of stable frequency light oscillations is discussed.