Q-Switched Pulse and Mode-Locked Pulse Generation From a Yb3+-Doped Fiber Laser Based on Bi2Se3

Q-Switched Pulse and Mode-Locked Pulse Generation From a Yb3+-Doped Fiber Laser Based on Bi2Se3

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The Q-switched pulse and mode-locked pulse were investigated in an all-normal dispersion Yb-doped fiber laser (YDFL) based on the topological insulators (TIs) with mixing of polyvinyl alcohol (PVA) to produce Bi2Se3/PVA film or deposition on the end facet of fiber to manufacture TI-compatible fiber.Through the dark Bi2Se3/PVA films with large nonsaturable loss, the YDFL was operated in the Q-switched state.The repetition rate and the duration of the Q-switched Mains Power Cable pulses increased and declined, respectively, with the pump power to show 2.2 μs duration and 137.8 kHz repetition rate at the highest pump power.

Moreover, the mode-locked pulses, with a 16 MHz repetition rate and Hat 380 ps pulsewidth, were generated at high pump power by using the light Bi2Se3/PVA film.By means of a Bi2Se3 compatible fiber, through optical deposition of the Bi2Se3 nanoplatelets on the end facet of the fiber, the mode-locked YDFL was generated at low-threshold pump power and revealed more stabilized operation state up to two hours.