Coherent light generators – Particular active media – Semiconductor
Patent
1989-10-10
1991-09-17
Sikes, William L.
Coherent light generators
Particular active media
Semiconductor
372 18, 372 19, 372 50, 385 39, 385 15, 385130, H01S 319
Patent
active
050501801
ABSTRACT:
An array of semiconductor laser diodes having parallel waveguide elements, of which each adjacent pair is coupled together by an X-shaped waveguide junction having a connecting waveguide in which lateral modes are formed as a result of merging of the pair of waveguide elements. The waveguide elements diverge again from the connecting waveguide at an angle great enough to ensure that there are high scattering and radiation losses near the point of divergence of the waveguide elements, for the fundamental mode in the connecting waveguide. If an adjacent pair of waveguide elements operate in phase, this excites the fundamental mode in the connecting waveguide, which is effectively suppressed by the losses that occur near the point of divergence from the connecting waveguide. The structure thereby discriminates against connecting waveguide in an in-phase mode, resulting in operation in the 180.degree.-phase-shift array mode, and the production of a diffraction-limited beam at high drive currents and output powers.
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Botez Dan
Mawst Luke J.
Goldstein Sol L.
Hansen Galen J.
Heal Noel F.
Sikes William L.
TRW Inc.
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