Abstract
We report a semiconductor saturable absorber mirror $Q$ -switched holmium (Ho3+)-doped ZrF4–BaF2–LaF3–AlF3–NaF fiber laser operating at ~1190 nm in a linear cavity. Stable $Q$ -switched operation was established at a threshold pump power of 92.8 mW with a repetition rate of 26.1 kHz and a pulsewidth of $4~\mu \text{s}$ . The repetition rate increased and the pulsewidth decreased with an increasing pump power. When the pump power was increased to 830 mW, 800-ns $Q$ -switched pulses with a pulse energy of $0.18~\mu \text{J}$ at a repetition rate of 170 kHz were generated.
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