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Physical Review A

Correlations in extended high-density superfluorescence: A self-organized distributed feedback laser

L.O. Schwan, P. Schwendimann, E. Sigmund

Published Dec 1, 1989• 19 citations
Publisher

Abstract

We present a simple model that allows a description for the correlation of counterpropagating waves and the formation of spatial patterns in superfluorescent emission. No separation between left- and right-running waves is performed, and retardation effects are fully included. The results indicate qualitative agreement between our calculations and experiments in KCl:${\mathrm{O}}_{2}^{\mathrm{\ensuremath{-}}}$. .AE

DOI
10.1103/physreva.40.7093

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Recent experiments on superfluorescence from O 2 - centres in KCl host crystals, with quasi-one-dimensional active volumes, have shown identically shaped and perfectly synchronized forward and backward pulses in each run. This is in blatant contrast to previous experiments on atomic beams and gases in which no forward-backward correlation beyond energy conservation had been found. We argue that a linear coupling due to backscattering from the bulk or the surface of the active volume, a phenomenon much weaker in gases than in solids, is responsible for the effect.

Europhysics Letters (EPL)•Nov 1, 1989•18 citations
We present a simple model that allows a description for the correlation of counterpropagating waves and the formation of spatial patterns in superfluorescent emission. No separation between left- and right-running waves is performed, and retardation effects are fully included. The results indicate qualitative agreement between our calculations and experiments in KCl:O2\ensuremath−{\mathrm{O}}_{2}^{\mathrm{\ensuremath{-}}}O2\ensuremath−​. .AE
Correlation of the parameters (delay times, peak intensities) of counterpropagating superfluorescence pulses is studied within the framework of a one-dimensional theoretical model depending on the sharpness of boundaries of the excitation region. The concentration N 0 of the initially excited active centers is described by a smoothed profile (decaying to zero within the h − and h + wide intervals at the left-and right-hand ends of the sample, respectively), rather than by a rectangular profile. It is established that variation of the excitation region boundary widths h ± does not eliminate the observed correlations. Moreover, the correlations can significantly increase for the samples with a length of L = n λ/2, where n is any natural number and λ is the resonance light wavelength. The oscillating dependence of the parameters of counterpropagating superfluorescence pulses on the h ± values and a significant asymmetry of these pulses for h − ≠ h + are discussed.
Recent experiments on superfluorescence from O 2 - centres in KCl host crystals, with quasi-one-dimensional active volumes, have shown identically shaped and perfectly synchronized forward and backward pulses in each run. This is in blatant contrast to previous experiments on atomic beams and gases in which no forward-backward correlation beyond energy conservation had been found. We argue that a linear coupling due to backscattering from the bulk or the surface of the active volume, a phenomenon much weaker in gases than in solids, is responsible for the effect.