Abstract
Based on recent experimental observations and numerical simulations [1-4], we develop an analytical theory of spontaneous low-threshold mode-locking in a long homogeneously-broadened fiber laser with slow relaxation of inversion. We show that the phenomenon originates from the self-consistent parametric resonance and beat-frequency-locking of paired “hot” modes taking place due to coherent nonlinear effects in the system of active two-level centers. An important role of the Risken-Nummedal-Graham-Haken [5-7] multimode instability is discussed.
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Kocharovsky, V.V., Kocharovsky, V.V. Cooperative Parametric Instability of Natural Modes and Coherent Mechanism of Self-Mode-Locking in a Ring Class-B Laser. Radiophysics and Quantum Electronics 44, 443–449 (2001). https://doi.org/10.1023/A:1017901314807
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DOI: https://doi.org/10.1023/A:1017901314807