An He-implanted optical planar waveguide in an Nd:YGG laser crystal preserving fluorescence properties

► The planar waveguide formed by the ion implantation method on the Nd:YGG crystal was investigated for the first time. ► The implantation processes had almost no influence on the absorption properties at the wavelength scale of w > 550 nm on account of the absorption spectrum. ► The microluminescence investigation reveals that, in the waveguide, the fluorescence properties of the Nd3+ ions and the energy transfer efficiency were not deteriorated by the helium implantation.