Single mode broad area distributed Bragg reflector ring oscillators

Kenneth M. Dzurko, Donald R. Scifres, Amos Hardy, David F. Welch, R. G. Waarts

Research output: Contribution to journalArticlepeer-review


A large aperture, spatially coherent, single frequency semiconductor ring laser is demonstrated for the first time. Two diffraction gratings oriented orthogonally to each other are used to uniquely select a single broad area mode which oscillates at a single wavelength. Spatial coherence across a 411 μm output aperture is observed, giving a diffraction limited output beam measuring 0.2°×0.135°. The surface emitting ring oscillators contain strained InGaAs/GaAs quantum well active regions and operate at 1012 nm to pulsed output powers exceeding 500 mW with threshold current densities under 300 A/cm2.

Original languageEnglish
Pages (from-to)2389-2391
Number of pages3
JournalApplied Physics Letters
Issue number20
StatePublished - 1992
Externally publishedYes


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