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Phys Rev Lett. 2002 Jan 28;88(4):040601. Epub 2002 Jan 10.

Experimental evidence of stochastic resonance in an excitable optical system.

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1
Department de Física Interdisciplinar, Instituto Mediterráneo de Estudios Avanzados (CSIC-UIB), C/ Miquel Marqués 21, E-07190 Esporles, Spain.

Abstract

Experimental evidence of stochastic resonance in an excitable optical system is reported. We apply a sinusoidal forcing to the system and, for a finite external noise level, we find a frequency for which the excitable pulsing occurs periodically at the frequency imposed by the modulation. This resonant frequency matches the inverse of the average escape time of the stochastically driven system (i.e., without forcing). The same resonance is found by varying the noise level for fixed forcing frequencies. We discuss different indicators in order to describe quantitatively the degree of resonance.

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