Waveguide Fabrication in Yb3+ Doped Phosphate Glass by 50 kHz Repetition Rate Ultrafast Laser

摘要

Waveguide (trace guiding type) inscription condition inside Yb3+ doped phosphate bulk glass was investigated under irradiating of 50 kHz repetition rate volume ultrafast lasers. We processed single trace and multi-core ones inside the bulk material, the captured near field mode pattern con-firmed that both structures perform good guiding properties. Beam shaping technique was adopted during fabrication of the single trace in order to obtain a relative symmetric waveguide cross section. Waveguide lasing was achieved in the single line trace with a linear cavity configuration. The max-imum laser output of 11 mW was obtained under mono-directional of 980 nm space light pumping, with ~2% corresponding slope efficiency. Guiding mode could be manipulated in the Expanded-core waveguide (ECW) by extra design freedom in the structure parameter, and ECW generally support larger effective mode area light transporting.