Stable passive $Q$-switching of a $\mathrm{Tm}\text{:}{\mathrm{LiYF}}_4$ laser is obtained using polycrystalline ${\mathrm{Cr}}^{2+}\text{:}\mathrm{ZnS}$ as a saturable absorber. The achieved maximum pulse energy of 0.9 mJ and peak power of 65 kW for a pulse duration of $\sim 14\mathrm{ns}$ represent substantial improvement and highest values for a passively $Q$-switched diode-pumped Tm laser operating at $\sim 1.9\mathrm{\mu m}$.

© 2012 Optical Society of America

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