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A Q-switched, mode-locked fiber laser based on cavity loss modulation at a subharmonic frequency of the fundamental intermode frequency spacing is experimentally demonstrated. This simple approach is shown to be capable of producing high quality Q-switched, mode-locked pulses.
We experimentally demonstrate the use of an ultrafast Si-based variable optical attenuator (VOA) as a Q-switch for rare earth-doped fiber (EDF) lasers. It is shown that Q-switched pulses with a temporal width of less than 86 ns could be readily obtained using the variable VOA with a repetition rate of up to 1 MHz.
A passively mode-locked fiber laser is realized using an intracavity intensitymodulating effect in multilayered graphene efficiently prepared by taping method. 10.6-MHz pulse trains with 40-dB extinction rate are guaranteed by the physically exfoliated graphene.
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