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’Dark Beams’ Revealed

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Researchers have tried to demystify the presence of "dark beams," complex arrays that result from emissions of broad-area vertical-cavity surface-emitting lasers. A team from Haifa University in Israel discovered that these dark spot arrays consist of multiple, closely packed optical vortices. Optical vortices are optical fields that have phase singularities and show increased complexity as the injection current level is raised. The group observed that most of these light distributions are not the result of multifrequency operation, but exhibit single-frequency characteristics....Read full article

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    Published: September 1999
    Research & TechnologyTech PulseLasers

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