Full Bandwidth Time-Domain Intensity Statistical Characteristics of Raman Random Fiber Laser Based on a Temporal Dynamics Controllable Pump

The temporal dynamics and statistical characteristics of Raman random fiber lasers are of great significance for studying their physical properties and applications. In this paper, the effect of pump dynamics on the temporal intensity statistical properties of Raman random fiber lasers is experimentally studied under full bandwidth measurements. The measured intensity probability density function (PDF) of the Raman random fiber laser pumped by an ytterbium-doped random fiber laser (YRFL) deviates inward from the exponential distribution. We further use the spectrally filtered YRFL with different temporal dynamics properties as the Raman pump, and the results reveal that the PDF of the Raman random fiber laser deviates outward from the exponential distribution, and the probability of extreme values increases by using a filtered YRFL pump with larger temporal intensity fluctuations. This work provides experimental evidence of the important role of pump properties on the statistics of a random Raman fiber laser, which could be crucial to tailoring the dynamics of random fiber lasers for various applications such as frequency doubling, supercontinuum generation, and laser inertial confinement fusion.