Coherence Resonance is demonstrated in a semiconductor laser without external noise. The experimental evidence is reported in the Low Frequency Fluctuations of a chaotic diode laser with optical feedback. The phenomenon is also verified numerically using the Lang-Kobayashi equations for a single solitary mode laser, without noise terms. Fast deterministic dynamics plays the role of an effective exciting noise, narrowing the resonance in the autonomous slow power drops cycles of the laser. This phenomena is the extension of deterministic Stochastic Resonance and Coherence Resonance as predicted and observed in recent years.
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