Yb³⁺-Doped Four-Wavelength Double Clad Laser

A novel Yb³⁺-doped four-wavelength double clad fibre laser based on a Fabry-Parot filter, and pumped by a 976 nm laser diode is presented. Its output laser wavelengths are 1085, 1090, 1095, and 1010 nm, respectively. The laser exhibits 0.32 nm line-width, 1.5 W laser output power, 40 dB signal-to-noise ratio and 66% slope efficiency.