Abstract
An analysis is made of the possibility of isolating relatively high-Q modes or groups of such modes in low-Q combined Fabry-Perot cavities with distributed feedback of counter-propagating waves in order to ensure resonant interaction of the electromagnetic field with the polarization oscillations of an amplifying or absorbing medium filling the cavity. We considered two-level active media with homogeneous or inhomogeneous broadening of a spectral line, which can be both smaller or larger than the photon bandgap of a cavity. Particular attention is paid to the change in the well-known spectrum of polariton modes which takes place due to the transition from an absorbing to an amplifying medium under conditions that allow the realization of spontaneous or laser generation of the so-called superradiant modes.
Highlights
Distributed feedback (DFB) of counter-propagating waves, due to various periodic structures and accompanying the reflection of waves from the mirrors of Fabry-Perot cavities (FP), is widely used in various physical research and modern technologies, for example, semiconductor ones [1,2,3]
The properties of the combined Fabry-Perot cavity with distributed feedback (FPDFB) are not yet sufficiently studied, and in this paper we consider the features of the mode spectra of such a cavity both in the absence of an active medium and in the presence of an absorbing or amplifying medium with homogeneous or inhomogeneous broadening of the spectral line
High-frequency oscillations of the electromagnetic field in an empty cavity are characterized by the photon lifetime TE, which determines the Q-factor of cold modes
Summary
Distributed feedback (DFB) of counter-propagating waves, due to various periodic structures (photonic crystals) and accompanying the reflection of waves from the mirrors of Fabry-Perot cavities (FP), is widely used in various physical research and modern technologies, for example, semiconductor ones [1,2,3]. It allows one to control the quality factor of modes in relatively low-Q cavities, which are required for the unique lasing regimes available in the presence of highly amplifying active media (both classical, such as electron beams, and quantum, such as semiconductor heterostructures) [4, 5] In this regard, the properties of the combined Fabry-Perot cavity with distributed feedback (FPDFB) are not yet sufficiently studied, and in this paper we consider the features of the mode spectra of such a cavity both in the absence of an active medium (the so-called cold modes) and in the presence of an absorbing or amplifying medium with homogeneous or inhomogeneous broadening of the spectral line (the so-called hot modes)
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