High-power, high-brightness, phase-locked broad-stripe diode lasers

A novel superlinear graded index separate confinement laser diode structure is proposed. Single stripe diode lasers with 210 μm emitting aperture generate 3.2 W cw, and 6.3 W quasi‐cw of light‐output power in a phase‐locked operation. The catastrophic optical density (30 W/mm) obtained for these lasers is better than that reported for devices with nonabsorbing mirrors.