Abstract

We report the experimental investigation of visible passively $Q$-switched ${\mathrm{Pr}}^{3+}$-doped all-fiber lasers with tungsten disulfide (${\mathrm{WS}}_2$) saturable absorber, where red-light short-pulse generations from different output mirror transmissions are systemically characterized. The proposed simple and compact all-fiber linear cavity was constructed by a fiber-pigtail-based blue laser-diode pump, a ${\mathrm{Pr}}^{3+}$-doped fluorozirconate glass active fiber, and the fiber end-facet mirrors. Integrating a free-standing layered ${\mathrm{WS}}_2$ film into the laser cavity initiated the $Q$-switching operation. Stable microsecond-duration output pulses with kilohertz repetition rates are achieved, corresponding to a few mW/nJ average output power and single-pulse energy. The comparisons on red-light $Q$-switched output parameters for output transmissions of both $\sim 40\%$ and $\sim 80\%$ are performed. This work could provide a useful guideline to manipulate the output performance of visible pulsed all-fiber lasers for various practical applications.

© 2017 Optical Society of America

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