High-power index-guided multiridge waveguide laser array

InGaAsP quasi-index-guided multiridge waveguide laser arrays emitting at 1.3 μm have been fabricated. The lasers have threshold currents in the range 300–400 mA at 30 °C and have been operated to pulsed output powers as high as 500 mW. More than 150 mW of output power has been obtained up to an ambient temperature of 60 °C. The lasers emit in multilongitudinal mode with a far-field divergence of ∼15°×45°. A quasi-index-guided laser array of the type described here can be used in applications requiring high-power lasers emitting at 1.3 μm.