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The authors propose and demonstrate a novel mechanism for Q-switching an Er-doped fibre laser at 1.5 µm, based on strong mode frequency modulation of the intracavity pump laser diode under current modulation. The laser is effectively Q-switched when the diode mode frequency is swept through the reflection window of a diffraction grating in the fibre laser cavity acting as a frequency-dependent reflector.
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Okhotnikov et al. (1994) studied this question.
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