We report experimental demonstration of graphene mode-locked operation of $rm Tm^3 + !!rm YLiF_4$Tm3+YLiF4 (YLF) and $rm Tm^3 + !!rm KY_3rm F_10$Tm3+KY3F10 (KYF) lasers near 2.3 µm. To scale up the intracavity pulse energy, the cavity was extended, and double-end pumping was employed with a continuous-wave, tunable $rm Ti^3 + !!rm…[Read more]