Abstract

We report on a miniature $\mathrm{Yb}\text{:}{\mathrm{LuPO}}_4$ crystal laser at 1.01 μm that is passively $Q$-switched with a sapphire-based few-layer ${\mathrm{WS}}_2$ saturable absorber, and that can be operated under very high output couplings ($\ge 80\%$). With 12.6 W of pump power absorbed, an average output power of 4.35 W is generated at a repetition rate of 1.33 MHz with a slope efficiency of 47%. The maximum pulse energy and highest peak power achieved are 3.41 μJ and 110 W, respectively; while the shortest pulse duration obtained is 28.6 ns. To the best of our knowledge, these results represent the highest output power and shortest pulse duration ever achieved in the 1 μm region from solid-state lasers passively $Q$-switched by using two-dimensional saturable absorbers.

© 2018 Optical Society of America

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