Abstract
This work reports on the dynamic evolution of narrow linewidth modes in stochastic Brillouin random fiber lasers with ultra-high resolution time-resolved spectroscopy technique. New fundamental aspects are revealed, including strong mode competition in multimode operation. It shows that single-mode operation is only possible near threshold in pulsed regime. Just above threshold, lasing becomes multimode, still in pulsed regime. Well above threshold quasi-CW multimode operation is observed with strong mode competition, exhibiting high-intensity noise, governed by multimode beating, and slow average intensity variations induced by Rayleigh scattering random fluctuations.
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