980 nm Yb-doped double-clad photonic crystal fiber amplifier and its frequency doubling

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

► A quasi-three-level flexible Large-mode-area double-clad 980 nm Yb-doped photonic crystal fiber (PCF) amplifier was studied.
► In the 980 nm amplifier, a 980 nm PCF oscillator was used for the seed source.
► Frequency doubling of the 980 nm PCF laser with a novel nonlinear crystal BIBO were studied experimentally for the first time.