Summary form only given. High power monolithic laser diode arrays lasing at 1.9 /spl mu/m are important optical sources for pumping, medical uses and "eye-safe" illumination. Previously, 5.5 W CW power has been reported for a 20% fill factor 1 cm wide array on a 10/spl deg/C conductively cooled heat sink. In the paper 11 W CW power has been demonstrated for a 16% fill factor 1 cm wide array on a 10/spl deg/C conductively cooled heat sink, which is twice the level of previously reported best results. In addition, the performance data of a 2-D stack and reliability data of the arrays are reported.