Abstract

We report the ${Q}$-switched operation of a ${{\rm Tb}^{3 + }}$-laser for the first time, to the best of our knowledge. The passive${\!\!Q}$-switching was realized by a 15% ${\rm Tb}{:}{\rm LiYF}_4$ gain medium and a single-layer graphene saturable absorber. An average output power of 744 mW at 544 nm was achieved with slope efficiency of 41%, pulse width of 2.9 µs, and repetition rate of 38.7 kHz. The corresponding pulse energy and peak power were calculated to be 19.2 µJ and 6.6 W, respectively.

© 2020 Optical Society of America

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