title: 8.5 W VECSEL output at 1270 nm with conversion efficiency of 59%.
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.
authors.forename: S T
authors.initials: ST
authors.lastname: Keller
authors.forename: A
authors.initials: A
authors.lastname: Sirbu
authors.forename: V
authors.initials: V
authors.lastname: Iakovlev
authors.forename: A
authors.initials: A
authors.lastname: Caliman
authors.forename: A
authors.initials: A
authors.lastname: Mereuta
authors.forename: E
authors.initials: E
authors.lastname: Kapon