In-band pumped, high peak-power gain-switched mode-locked thulium-doped fiber laser at 1925 nm

We reported an all-fiber gain-switched mode-locked thulium-doped fiber laser operating at 1925 nm. A 1570 nm mode-locked laser with pulse width and repetition rate of 340 ps and 6.54 MHz, respectively, was used as a pump source. We generated gain-switched pulses with a maximum frequency of 25.8 kHz at 126 mW pump power. Mode-locked pulses were simultaneously generated and were visible inside the gain-switched envelope. The pulse width, repetition rate, average power, and peak power of the mode-locked pulses at 1925 nm were 105 ps, 20 MHz, 4.9 mW and 2 W, respectively, at a pump power of 160 mW.