Embodiments include a fiber optic laser system having at least one optical waveguide with a laseable core and a pump cladding disposed adjacent the lasing core. A source of electromagnetic pumping energy is disposed adjacent to the optical waveguide and has an emission axis that is directed toward the optical waveguide. An optically reflective surface is disposed towards the optical waveguide and may be configured as an enclosure disposed about at least a portion of the optical waveguide. An index matching material may be disposed within the enclosure and in contact with at least a portion of the optical waveguide.