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Optical and Quantum Electronics

Projecting the unstable solutions of the integro-differential Maxwell-Bloch equations on to finite-dimensional subspaces: methods and performances

Belkacem Meziane

Published Feb 1, 1998• 4 citations
Publisher
DOI
10.1023/a:1006974927117

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This paper aims at demonstrating that the dynamic gain contour of an inhomogeneously broadened laser tuned to line center undergoes a lateral saturation effect in its unstable regime of operation. Such an effect is shown to be contained in the numerical solutions of the integro-differential Maxwell-Bloch equations that describe the system. After delimiting the domain of applicability of the usual small-sideband approach in describing dynamic gain profiling, we apply a strong harmonic-expansion method to these same equations to obtain an analytical expression that shows an excellent fit with the results of the numerical simulations.
We derive and study the hyperbolic reduced Maxwell-Bloch (HRMB) equations, a simplified model for the dynamics of strongly correlated Bose-Einstein condensates (BECs), and in particular for the interaction between the BEC atoms and its evaporated atoms under the strong interactions. This equation is one among four, which are proven to be integrable via the existence of a Lax pair, and thus the method of inverse scattering transform. Another equation is the reduced Maxwell-Bloch equation of quantum optics and the two others do not have physical applications yet. By studying the linear stability of the constant solutions of these four equations we observe various regimes, from stable, to modulational unstable, and unstable at all frequencies. The finite-dimensional reduction of the RMB equations is also used to give more insight into the constant solutions of these equations. From this study, we find that the HRMB equation arising from strongly correlated BECs is stable under the particular condition that the transition rate of evaporation is not too large compared to the number of evaporated atoms. We then derive explicit soliton solutions of the RMB equations and use numerical simulations to show collisions of solitons and kink solitons.