Abstract
We demonstrate a stable hybrid Q-switched Er-doped fiber (EDF) laser with WS2 as the saturable absorber (SA). The SA device is obtained by depositing WS2 on a tapered fiber using the pulsed laser deposition method. The modulation depth of the SA is 8.0%, the nonsaturable loss is 30%, and the saturation intensity is 200 MW/cm2. By combining the saturable absorption of fiber-taper WS2 and the effect of nonlinear polarization rotation, the Q-switched EDF laser is achieved with a pulse duration of 443 ns and average power of 43 mW. The repetition rate can be adjustable among 235–365 KHz. To our best knowledge, both pulse duration and output power are the best results among Q-switched EDF lasers with transition mental dichalcogenide materials like SAs. These results indicate that the proposed hybrid Q-switched EDF laser performs better to achieve shorter pulses with higher power in the future.
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