STRAINED INGAAS/INP QUANTUM-WELL LASERS

Quantum well lasers based on strained InxGa1 -xAs/InP were grown by atmospheric pressure metalorganic vapor phase epitaxy. Buried-heterostructure lasers with the active layer consisting of three quantum wells, each ∼50 Å thick, placed in a continuously graded waveguide, exhibit threshold currents as low as 15 mA, high quantum efficiency (24%), and power output (∼100 mW), independent of composition. Changing the In concentration from x=0.48 to 0.62 results in the lasing wavelength shift from 1.45 to 1.62 μm. These wavelengths are in excellent agreement with the calculated energies of the electron-heavy hole exciton transition.