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Efficient 1645 nm Er:YAG laser pumped by 1532nm diode laser with narrow band

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Abstract

In order to obtain laser output around 1.6um with high power and high overall efficiency, 1532nm narrow-band LD directly pumped Er:YAG laser is investigated. Performance of laser output with distinct doping concentration of gain medium is recorded and compared. Using 0.25% doped, 4cm long Er:YAG rod as the gain medium, we get over 10W laser output with about 31W incident pump power. The optical efficiency is about 33% and the slope efficiency with respect to the absorbed pump power is as high as 83%. Up to now, this is the most efficient Er:YAG laser pumped in this manner with traditional rod or slab geometry.

© 2011 Optical Society of America

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