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Physical Review Letters

Asymmetry of Operation and Energy Trapping in a Superradiant Laser

Igor V. Mel’nikov

Published Jul 29, 1996• 12 citations
Publisher

Abstract

On working beyond the slowly varying envelope approximation, the instability of superfluorescent decay is investigated for the case in which the sample size is greater than or comparable to the resonant wavelength. The instability is associated with coupling between counterpropagating waves and can inhibit emission in the direction of the pump pulse. In particular, it is shown that tiny changes of the sample length can cause the forward emission to be switched off, suggesting that the optical analog of a directing antenna may be experimentally accessible.

DOI
10.1103/physrevlett.77.842

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On working beyond the slowly varying envelope approximation, the instability of superfluorescent decay is investigated for the case in which the sample size is greater than or comparable to the resonant wavelength. The instability is associated with coupling between counterpropagating waves and can inhibit emission in the direction of the pump pulse. In particular, it is shown that tiny changes of the sample length can cause the forward emission to be switched off, suggesting that the optical analog of a directing antenna may be experimentally accessible.
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.
A report is given of a study of the amplitude-spectral asymmetry of the stimulated emission of superfluorescence from dye solutions pumped longitudinally by nanosecond laser pulses. This amplitude asymmetry is manifested by the difference between the powers of the forward and backward waves, and it is a function of the rate of pumping and of the optical density of the active medium. The asymmetry of stimulated emission from a ring laser is manifested by the appearance of a wave with a traveling-wave ratio of ~90 in the absence of any optical isolators. The spectral asymmetry of a ring laser is manifested by a difference between the spectra of strong and weak waves traveling in opposite directions. A quantitative analysis is made of the effects based on the solution of the transfer equations for radiation traveling in a nonlinearly absorbing active medium.