The physical limit for the maximum extractable power of Tm-doped silica fiber lasers in resonantly-pumped
configuration is analyzed. The effect of thermal fracture, thermal lens, melting of the core, optical damage, finite pump
brightness and the nonlinear effects (stimulated Brillouin scattering or stimulated Raman scattering) are taken into
consideration. According to the numerical simulation, a maximum extractable power of 56.6 kW and 2.11 kW could be
achieved by theTm-doped fiber sources in resonantly-pumped configuration for the broad bandwidth and
single-frequency case, respectively. Strictly single-mode of these cases are also taken into consideration, and the
maximum extractable powers are 12 kW and 1.25 kW. The physical limit mechanism derived by this method proves that
the Tm-doped fiber sources in resonantly-pumped regime has a significant advantage over that in diode directly-pumped
regime, thus having practical significance for increasing the output power.
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