DEPRESSED INDEX CLADDING GRADED BARRIER SEPARATE CONFINEMENT SINGLE QUANTUM-WELL HETEROSTRUCTURE LASER

In this letter, we present data for a novel depressed index cladding laser structure which provides reduced perpendicular far-field divergence angle with acceptable low-threshold current densities. Narrow perpendicular divergence angles of 27-degrees full width at half maximum for a nearly perfect Gaussian beam shape have been measured, with a corresponding near-field spot size of 1.30-mu-m. Threshold current densities of 309 A/cm2 are observed for 150-mu-m stripewidth, 780-mu-m long devices with 0.80-mu-m transverse spot sizes. Pulsed output powers for unmounted devices are greater than 0.9 W/uncoated facet.