High brightness external cavity broad area diode laser bar using off-axis spectral beam combining

Off-axis spectral beam combining [1] has been applied to a broad area diode laser bar with a central wavelength 965 nm and a front facet anti reflection coating with residual reflectivity ≪ 0.01%. A combined output power of 9 W has been achieved from 12 emitters at an operating current of 30 A. The output beam had an M 2 value of 6.4 along the slow axis and 1.9 along the fast axis.