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We report the demonstration of high power (660 mW) CW operation of a diode-pumped mid-IR Er fiber laser. This was achieved by using efficient depopulation of the lower laser level via enhanced cross-relaxation between Er ions and energy transfer to Pr ions (at doping densities much higher than those used previously in Er:ZBLAN), along with optimal pumping of such lasers via custom-designed double-clad fluoride fibers.

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A compact cladding-pumped Er:ZBLAN mid-infrared pulsed fiber laser using a liquefying gallium mirror as a saturable absorber is demonstrated for the first time. Preliminary results give pulse widths of 7 µs and energies of 38 nJ.

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