Inherent stochastic linearization of random laser modes
نویسندگان
چکیده
Weakly scattering random lasers exhibit lasing modes that spatially overlap and can interact strongly via gain saturation. Consequently, lasing in highthreshold modes may be suppressed by strong low-threshold lasing modes. We numerically examine the effect of inherent spontaneous emission noise on this strong nonlinear phenomenon. With a method to incorporate this noise into the Maxwell–Bloch equations for simulations of random lasers, emission below the lasing threshold is observed and the noise restrains dramatic nonlinear behaviour above threshold. The result is a linearization of random laser modes, made possible when noise overcomes spatial hole burning. Results suggest that control over the noise properties of the gain medium may facilitate or inhibit certain modes to lase in the multimode regime. Mathematics Subject Classification: 78A60, 78A48, 60G20 PACS numbers: 42.55.Zz, 42.60.Mi, 05.40.Ca (Some figures may appear in colour only in the online journal)
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