Tuneable operation of core and cladding pumped holmium fibre lasers

Holmium fibre lasers are required for remote sensing, LIDAR and some medical applications. In comparison to thulium fibre lasers, the holmium emission provides efficient access to the 2070 nm-2150 nm wavelength range [1, 2]. We present the first report of the tuneable range of a resonantly, cladding pumped holmium fibre laser. This is compared to the tuning range of a core pumped holmium doped fibre.