Buried heterostructure window lasers have been developed, offering conservatively rated powers to 30 mW at 840 nm. Output beams are single spatial and multi-longitudinal mode. Accelerated aging tests project lifetimes greater than 105 hours.
"High power AlGaAs window lasers", Proc. SPIE 0610, Scientific and Engineering Applications of Commercial Laser Devices, (16 July 1986); doi: 10.1117/12.956394; http://dx.doi.org/10.1117/12.956394