8.5 W VECSEL output at 1270 nm with conversion efficiency of 59%.

Authors :: Keller ST
Sirbu A
Iakovlev V
Caliman A
Mereuta A
Kapon E
Source :: Optics express [Opt Express] 2015 Jun 29; Vol. 23 (13), pp. 17437-42.
Publication Year :: 2015
Abstract: We report on 1270 nm vertical-external-cavity surface-emitting lasers (VECSELs) with up to 59% conversion efficiency and maximum output power of 8.5 W (pump limited), at 5°C heat sink temperature. These VECSELs comprised wafer-fused gain mirrors in the flip-chip (thin-disk) heat dissipation scheme. The reflected pump light from the gain mirror surface was found to depend considerably on temperature and pump power.