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We have demonstrated a passively Q-switched Erbium-doped fiber laser using PbS quantum dots polystyrene film (QDPF) as saturable absorbers (SAs). Compared with other SA materials, PbS QDPFs have advantages of broad absorption range, high quantum yield, and facile preparation. We have successfully generated stable Q-switched pulse with a repetition rate of 20.98 kHz. To our knowledge, this is the first...
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