Abstract

We report a 30 cm long ${\mathrm{Nd}}^{3+}/{\mathrm{Yb}}^{3+}$ co-doped silica glass fiber amplifier with well-maintained broadband gain through simultaneous dual-laser pumping at 808 and 975 nm. By controlling the ratio of the pump power at 975 ($P_{975}$) and 808 nm ($P_{808}$), the emission band of ${\mathrm{Yb}}^{3+}/{\mathrm{Nd}}^{3+}$ and the energy transfer efficiency of ${\mathrm{Nd}}^{3+}\to {\mathrm{Yb}}^{3+}$ can be well controlled; thus, a tunable broadband and flat gain in the range of 1036–1080 nm are obtained. The theoretical calculation of the energy transfer efficiency of ${\mathrm{Nd}}^{3+}\to {\mathrm{Yb}}^{3+}$ with dual-laser pumping of 808 and 975 nm explains well the mechanism of broadband and flat gain formation in the ${\mathrm{Nd}}^{3+}/{\mathrm{Yb}}^{3+}$ co-doped fiber.

© 2018 Optical Society of America

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