Coherence loss of partially mode-locked fibre laser

Year: 2016

Authors: Gao L., Zhu T., Wabnitz S., Liu M., Huang W.

Autors Affiliation: Chongqing Univ, Minist Educ, Key Lab Optoelect Technol & Syst, Chongqing 400044, Peoples R China; Univ Brescia, Dipartimento Ingn Informaz, Via Branze 38, I-25123 Brescia, Italy; INO CNR, Via Branze 38, I-25123 Brescia, Italy.

Abstract: Stochastically driven nonlinear processes limit the number of amplified modes in a natural system due to competitive mode interaction, which is accompanied by loss of coherence when increasing the complexity of the system. Specifically, we find that modulation instability, which exhibits great fluctuations when it spontaneously grows from noise in conservative systems, may possess a high degree of coherence in dissipative laser system with gain. Nonlinear mode interactions can be competitive or cooperative: adjusting the intracavity polarization state controls the process of loss of coherence. Single-shot spectra reveal that, first, the fibre laser redistributes its energy from the center wavelength mode into sidebands through parametric instabilities. Subsequently, longitudinal modes are populated via cascaded four-wave-mixing. Parametric frequency conversion populates longitudinal modes with a random distribution of position, intensity and polarization, resulting in partially (rather than highly) coherent pulses. These dynamics unveil a new route towards complex pattern formation in nonlinear laser systems, and they may be also beneficial for the understanding of supercontinuum, Kerr-combs phenomena, and optical rogue waves.

Journal/Review: SCIENTIFIC REPORTS

Volume: 6      Pages from: 24995-1  to: 24995-12

More Information: This work was supported by the Natural Science Foundation of China (No. 61405020, 61475029, and 61377066) and the Science Fund for Distinguished Young Scholars of Chongqing (No. CSTC2014JCYJJQ40002). The work of Stefan Wabnitz was supported by the Italian Ministry of University and Research (MIUR) (2012BFNWZ2).
KeyWords: Noise-like Pulses; Modulation Instability; Generation; Graphene; Fluctuations
DOI: 10.1038/srep24995

Citations: 21
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