High power ytterbium fiber lasers at extremely long wavelengths by photonic bandgap fiber technology

摘要

Yb-doped photonic-bandgap fiber sources operating at the long-wavelength edge of the gain band are presented. Novel gain-profile engineering by the bandpass distributed filtering enables amplified-spontaneous-emission-free gain and power scaling to >;15dB and >;160W at 1178nm.