Few-layer ReS2(1−x)Se2x nanoflakes for noise-like pulse generation in a mode-locked ytterbium-doped fiber laser
We investigated the ternary ReS2(1−x)Se2x alloys and fabricated few-layer ReS1.02Se0.98 nanoflakes to realize passive Q-switch and noise-like pulses operating at 1 μm wavelength. Stable Q-switching pulses can be achieved with a threshold pump power of 180 mW and a maximum pump power of 300 mW. The single pulse energy of 81.47 nJ and pulse width as narrow as 2.2 μs at 1035 nm center wavelength were achieved. By optimizing the parameters of the cavity, self-started noise-like pulses were realized, which are centered at 1031 nm. The average pulse width of the spike was 283 fs on the top of a broad pedestal and the fundamental repetition was 38.98 MHz. Our work demonstrates that ReS1.02Se0.98 has potential applications in optical modulators, and also opens up new application opportunities for these novel materials in nonlinear optics and ultrafast laser photonic technologies.