Near and Mid Infrared Channeled Waveguide Lasers in Rare-Earth Ion-Doped Fluoride Crystals

Femtosecond laser written waveguide lasers operating in the near and mid infrared region at 1318 nm and 2700-2800 nm were investigated by using $\mathrm{Nd}^{3+}: \mathrm{BaY}_{2} \mathrm{~F}_{8}$ and $\mathrm{Er}^{3+}:$ YiLF
4
crystals.