Abstract
A liquid-cooled CW fiber laser with a multimode-core Er-doped ZBLAN fiber has been developed. The output power of and an optical-to-optical efficiency of 14.5% (with respect to incident pump power) were obtained with diode pumping. Efficient cooling was implemented by a combination of fluid cooling over the entire length of the fiber and conductive cooling at both end faces of the fiber. Consequently, stable high-power operation was demonstrated. To our knowledge, this is the highest output power obtained by a fiber laser. Furthermore, the high power can be further scaled up, since the output power in the present work is limited only by the available pump power.
© 2009 Optical Society of America
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