Abstract
In this paper, we report on a large-mode-area double-clad 980nm Yb-doped photonic crystal fiber (PCF) amplifier. In the experiment, an output power of 1.21W at 980nm with 2.5nm bandwidth has been yielded when the PCF length was 40cm. Through frequency doubling the 980nm amplified laser with a BIBO crystal, an output power of 51mW at 490nm has been generated.
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