Abstract

We report a dual-wavelength-pumped (1220 nm + 1050 nm) ${\mathrm{Tm}}^{3+}$-doped ZBLAN fiber master oscillator power amplifier (MOPA) system at 813 nm for the lattice laser of the Sr optical lattice clock (OLC). Since the photodarkening effect of the ${\mathrm{Tm}}^{3+}$-doped fiber is more serious in the 800 nm region, it was suppressed by applying real-time photobleaching with a 532 nm laser for obtaining stable output. We also investigated the dependence of conversion efficiency on the launched pump power ratio (${\mathrm{P}}_{1220\mathrm{nm}}/{\mathrm{P}}_{1220+1050\mathrm{nm}}$) and found that the maximum conversion efficiency of 50% was obtained from the pump power ratio of 41%. By installing real-time photobleaching and dual-wavelength pumping, our MOPA system generated the maximum output power of 1.95 W with slope efficiency of 48%, which is the highest output power at around 810 nm from fiber laser sources, to the best of our knowledge.

© 2019 Optical Society of America

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