Hybrid Y-junction laser array

Details Hybrid Y-junction laser array Hybrid Y-junction laser array

1987-03-04

1989-02-28

Sikes, William L.

Coherent light generators

Particular active media

Semiconductor

372 45, 372 50, H01S 319

Patent

active

048092886

ABSTRACT:
A semiconductor laser array having a plurality of waveguides at least some of which are directly joined at Y-junctions. The region near the Y-junctions provides a phase boundary condition in which lightwaves propagating in adjacent waveguides are in phase. A combination of strong and weak waveguiding is provided, with strong waveguides that eliminate evanescent coupling from occuring at least in the Y-junction regions, and with weak guides near one or both end facets permitting evanescent coupling. The evanescent coupling between adjacent weak waveguides preserves the in phase relationship that was established in the Y-junction regions, resulting in a diffraction limited single lobe far field output. Alternatively, even without evanescent coupling, the modes can adjust their phases in the weak waveguides, where the propagation constant is less tightly specified by the geometry.

REFERENCES:
patent: 4255717 (1981-03-01), Scifres et al.
patent: 4594718 (1986-06-01), Scifres et al.
patent: 4594719 (1986-06-01), Ackley
patent: 4692925 (1987-09-01), Botez
Welch et al.; "In-Phase Emission From Index-Guided Laser Array Up to 400 mW"; Electronics Letters; Mar. 13, 86; vol. 22, No. 6 pp. 293-294.
Yang et al., "Single-Lobed Emission from Phase-Locked Array Lasers", Electronic Letters, vol. 22, No. 1, pp. 2-4, published Jan. 2, 1986.
Wang et al., "In-Phase Locking in Diffraction-Coupled Phased-Array Diode Lasers", Applied Physics Letters, vol. 48, No. 26, pp. 1770-1772, pub. Jun. 30, 1986.

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