The authors demonstrate rational harmonic mode-locking in a sigma-cavity Er-fibre laser. Stable pulse generation at a repetition rate up to 18.4 GHz with mark-to-space ratio better than 10 is achieved with intracavity dispersion management. The influence of the dispersion of intracavity fibre elements on minimum pulse duration is discussed.
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Foursa et al. (1997) studied this question.
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