Abstract
We report a 30cm long Nd3+/Yb3+ co-doped silica glass fiber amplifier with well-maintained broadband gain through simultaneous dual-laser pumping at 808 and 975nm. By controlling the ratio of the pump power at 975 (P975) and 808nm (P808), the emission band of Yb3+/Nd3+ and the energy transfer efficiency of Nd3+→Yb3+ can be well controlled; thus, a tunable broadband and flat gain in the range of 1036-1080nm are obtained. The theoretical calculation of the energy transfer efficiency of Nd3+→Yb3+ with dual-laser pumping of 808 and 975nm explains well the mechanism of broadband and flat gain formation in the Nd3+/Yb3+ co-doped fiber.
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