Abstract
We demonstrate a passive Q-switched all-fiber ring configuration in thulium-doped fiber laser (TDFL) cavity using a bismuth-doped fiber (BDF) as a saturable absorber (SA). A piece of 20 cm long BDF was spliced and incorporated in the laser cavity for Q-switching pulse generation. By raising the pump power from 454 mW to 564 mW, the repetition rate of the laser is tunable within a range from 18.10 kHz to 25.22 kHz while the pulse width reduces from 9.04 µs to 6.98 µs. At maximum pump power, the Q-switched TDFL has output power, a slope efficiency, pulse energy and peak power of 5 mW, 3.53 %, 0.2 µJ and 28.40 mW, respectively.
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