Abstract

We demonstrate a double-clad fiber laser that incorporates a pump-light absorbing coaxially located Tm3+-doped outer core that reaches threshold and resonantly pumps an Ho3+-doped inner core. Under cw diode pumping, the output from the laser displays a pulse modulated behavior at wavelengths corresponding to the Tm3+ transition and short gain switched pulses from the Ho3+ core that have mode-locked characteristics. The Ho3+ and Tm3+ fiber lasers simultaneously produced 1.5 W across 2040–2140 nm and operate at a pulse repetition frequency of 80  kHz and at pulse widths as short as 330 ns.

© 2009 Optical Society of America

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