Abstract
We demonstrate a state variable fiber pulse laser based on a graphene-integrated microfiber device. A 3-D microfiber coil integrated with graphene acts as a polarization-sensitive saturable absorber. By adjusting the polarization controllers, stable Q-switched pulses and mode-locked rectangular pulses are observed. To our knowledge, this is the first study conducted to achieve switching between rectangular pulses and Q-switched pulses while keeping the pump power constant. The rectangular pulses have a pulsewidth and repetition rate of ∼10 ns and ∼940 kHz, respectively, and the Q-switched pulses have a pulsewidth and repetition rate of ∼40 $\mu\mbox{s}$ and ∼4.8 kHz, respectively.
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