Abstract

In this Letter, a high-quality saturable absorber (SA) based on a multilayered two-dimensional ternary chalcogenide ${\mathrm{Ta}}_2{\mathrm{NiS}}_5$ with a narrow bandgap, has been successfully fabricated and used as a SA in a 1.9 μm spectral region. The nonlinear saturable absorption properties of the as-prepared SA have been investigated by using an open-aperture $Z$-scan method. A passively $Q$-switched all-solid-state laser operating at 1.9 μm has been realized with the ${\mathrm{Ta}}_2{\mathrm{NiS}}_5$ SA. The maximum average output power, shortest pulse width, pulse energy, and pulse peak power from the passively Q-switched (PQS) laser are 1.1 W, 313 ns, 22.0 μJ, and 71.0 W, respectively. This is the first demonstration of the saturable absorption property of ${\mathrm{Ta}}_2{\mathrm{NiS}}_5$, to the best of our knowledge. The results indicate well the promising potential of ${\mathrm{Ta}}_2{\mathrm{NiS}}_5$ as a broadband SA in realizing pulsed mid-infrared lasers with high performance.

© 2019 Optical Society of America

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