We demonstrate a double-clad fiber laser that incorporates a pump-light absorbing coaxially located -doped outer core that reaches threshold and resonantly pumps an -doped inner core. Under cw diode pumping, the output from the laser displays a pulse modulated behavior at wavelengths corresponding to the transition and short gain switched pulses from the core that have mode-locked characteristics. The and fiber lasers simultaneously produced 1.5 W across 2040–2140 nm and operate at a pulse repetition frequency of and at pulse widths as short as 330 ns.
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