A high-power $83\mathrm{W}$ cladding-pumped ${\mathrm{Tm}}^{3+}\text{-}{\mathrm{Ho}}^{3+}$ -doped silica fiber laser is reported. Using bidirectional $793\mathrm{nm}$ diode pumping, a maximum slope efficiency of 42% was produced after a threshold launched pump power of $12\mathrm{W}$ was exceeded. The laser operated at wavelengths near $2105\mathrm{nm}$ with moderate beam quality, i.e., $M^2\sim 1.5$ . Further power scaling of the fiber laser was limited by thermal failure of the fiber ends.