Energy level systems and transitions of Ho:LuAG laser resonantly pumped by a narrow line-width Tm fiber laser

Abstract

We presented a Ho:LuAG ceramic laser in-band pumped by a narrow emission line-width Tm fiber laser at 1907 nm. All of potential transitions between I-5(7) and I-5(8) manifold were discussed to form the Ho's in-band-pump energy level systems, which were not described in details earlier. For the emission band centered at similar to 2095 nm, both laser absorption and emission transition separately consisted of two groups were first analyzed and observed. Using output couplers (OCs) with different transmittances (T = 6, 10 and 20%), the similar similar to 0.5 W continuous-wave (CW) output power under an incident pump power of similar to 4.9 W was obtained, with twin (or triplet) emission bands respectively. The blue shift of center emission wavelengths was observed with the increase of transmittances. (C) 2016 Optical Society of America