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CAOL . International Conference on Advanced Optoelectronics and Lasers

Superradiant lasing and collective dynamics of active centers with polarization lifetime exceeding photon lifetime

Vl. V. Kocharovsky, E. R. Kocharovskaya, Vitaly V. Kocharovsky

Published Sep 1, 2013• 1 citation
Publisher

Abstract

Analytic theory and qualitative analysis of the threshold conditions, nonlinear formation and spectral features of the pulsed superradiant emission and cooperative radiative behavior of many-particle systems in a low-Q Fabry-Perot cavity with distributed feedback of counter-propagating electromagnetic waves are carried out. Novel superradiant lasers are shown to be promising in the information optics and condensed matter physics.

DOI
10.1109/caol.2013.6657515

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Analytic theory and qualitative analysis of the threshold conditions, nonlinear formation and spectral features of the pulsed superradiant emission and cooperative radiative behavior of many-particle systems in a low-Q Fabry-Perot cavity with distributed feedback of counter-propagating electromagnetic waves are carried out. Novel superradiant lasers are shown to be promising in the information optics and condensed matter physics.
By means of numerical modeling of nonlinear and analytical solution of linearized Maxwell-Bloch equations, we find an intriguing regime of a superradiant laser with a symmetric low-Q Fabry-Perot cavity equipped with a distributed feedback of counter-propagating waves. We find that, in a wide range of parameters, there is lasing of a strongly-asymmetric self-modulated powerful polariton mode accompanied by excitation of several almost symmetric weak polariton or electromagnetic modes. The frequency of the powerful mode is approximately coincides with a center of the laser spectral line, and the frequencies of the weak modes are outside the spectral line of an active medium. We show that such a lasing takes place due to formation of a self-consistent inhomogeneous asymmetric grating of population inversion of active centers that provides undamped Rabi oscillations of the population inversion and dipole moments of centers. The grating makes the powerful ‘central’ mode strongly asymmetric, and the Rabi oscillations of active centers excite the weak ‘sideband’ modes due to the quadratic resonant nonlinearity of the two-level active medium.
The recent experiments on a pulsed superfluorescence and prospects of a CW superradiant lasing in various active media, especially semiconductor heterostructures, [1] attract much attention to new coherent dynamical effects in such lasers. These effects take place in the case of very dense active medium and low-Q cavities when a photon (cavity) lifetime is much shorter than a polarization (optical dipole) lifetime of an active center. Here, on the basis of numerical modeling of the Maxwell-Bloch equations, we describe the steady and dynamic spontaneous symmetry breaking of the structure of the field, polarization and population inversion of an active medium with almost homogeneously broadened spectral line placed into a symmetric low-Q combined distributed feedback (DFB) Fabry-Perot cavity.
Abstract The electrodynamics of active continuous media is applied to theoretically examine collective spontaneous emission regimes of dipole oscillator ensembles. Recent experiments in which the superfluorescence phenomenon has been observed are reviewed. The focus is on propagation and interaction effects experienced by the inhomogeneous waves of active center polarization and electromagnetic fields. The superradiant laser dynamics is examined and prospects for the realization of superradiant lasers using low- Q cavities are discussed.
Abstract The electrodynamics of active continuous media is applied to theoretically examine collective spontaneous emission regimes of dipole oscillator ensembles. Recent experiments in which the superfluorescence phenomenon has been observed are reviewed. The focus is on propagation and interaction effects experienced by the inhomogeneous waves of active center polarization and electromagnetic fields. The superradiant laser dynamics is examined and prospects for the realization of superradiant lasers using low-Q cavities are discussed.