Abstract

We demonstrate a $Q$-switched erbium-doped fiber laser using tungsten disulfide (${\mathrm{WS}}_2$) as a saturable absorber. The ${\mathrm{WS}}_2$ is deposited onto fiber ferrules using a drop-casting method. Passive $Q$-switched pulses operating in the C-band region with a central wavelength of 1560.7 nm are successfully generated by a tunable pulse repetition rate ranging from 27.2 to 84.8 kHz when pump power is increased from 40 to 220 mW. At the same time, the pulse width decreases from a maximum value of 3.84 μs to a minimum value of 1.44 μs. The signal-to-noise ratio gives a stable value of 43.7 dB. The modulation depth and saturation intensity are measured to be 0.99% and $36.2\mathrm{MW}/{\mathrm{cm}}^2$, respectively.

© 2016 Optical Society of America

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