Laser operation of a bulk Tm

摘要

In this report we have presented a spectroscopic and CW laser characterization of an efficient thulium doped GPNG bulk germanate glass pumped at 792 nm by Ti:Sapphire radiation. Laser characterization gave a maximum slope efficiency of 50 % comparable to the crystalline counterparts and we believe, to the best of our knowledge, this being the best for Tm-doped bulk glass lasers. The maximum output power was of 190 mW with a 4 % OC for ∼500 mW of absorbed power. In this report we can confirm that Germanate glass proved a good host for 2 µm Tm