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A passively Q-switched thulium-doped fiber laser with single-walled carbon nanotubes

We demonstrate a passively Q-switched thulium-doped fiber laser by using single-walled carbon nanotube (SWCNT) polyvinyl alcohol (PVA) composite film as the saturable absorber (SA). A relatively large mode area on the SA was employed to avoid damage of the SWCNT/PVA film and benefit pulsed laser operation. Stable pulses of 85–164 kHz repetition rate were generated at 1967 nm with a maximum average output power of 103 mW. The single pulse energy was up to ∼0.63 μJ with ∼0.87 μs pulse duration.