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Spatio-temporal characteristics of filamentation in broad-area semiconductor lasers

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2 Author(s)
Marciante, J.R. ; Inst. of Opt., Rochester Univ., NY, USA ; Agrawal, G.P.

Using the time dependent rate equations appropriate for semiconductor lasers, we perform a linear stability analysis to derive an analytic expression for the filament gain as a function of the filament spacing, oscillation frequency, linewidth-enhancement factor, pumping level, and nonlinear refractive index. The spatio-temporal characteristics of filamentation are obtained for a given set of operating parameters by maximizing the filament gain. Our theory predicts that there is a critical value of the linewidth-enhancement factor below which broad-area lasers remain stable even at high pumping levels. Moreover, under certain conditions, the self-defocusing Kerr-type nonlinearity can be used to suppress filamentation even when the linewidth-enhancement factor exceeds this critical value

Published in:

Quantum Electronics, IEEE Journal of  (Volume:33 ,  Issue: 7 )