28 µm er3+: Liyf4 channeled waveguide laser upconversion pumped near 1.5 µm

Abstract

We present the first demonstration of a room-temperature, continuous-wave, femtosecond laser written channeled Er 3+ :LiYF4 waveguide laser operating at 2810 nm which is upconversion pumped near 1.5 µm with a threshold pump power as low as 93 mW.