High-power and low-divergence 980-nm InGaAs-GaAsP-AlGaAs strain-compensated quantum-well diode laser grown by MOCVD

High-power InGaAs-GaAsP-AlGaAs strain-compensated separate-confinement heterostructure double quantum-well lasers emitting at 980-nm wavelength have been grown by low-pressure metal-organic epitaxial chemical vapor deposition. Fabricated with a ridge waveguide, the lasers achieved an output power of 386 mW in the fundamental lateral mode without any kink being observed. By optimizing the laser structure parameters, a very low transverse beam divergence of 22.1/spl deg/ and a high slope efficiency of up to 0.89 mW/mA were obtained. The narrow transverse far field enables an output power of over 290 mW to be coupled into a single-mode fiber with a high coupling efficiency of 83.2% at 430 mA. Life testing at various powers shows excellent long-term reliability after 3500 h.