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What is a vertical cavity surface emitting laser (VCSELs)?

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VCSELs are semiconductor lasers, more specifically laser diodes with a monolithic laser resonator, where the emitted light leaves the device in a direction perpendicular to the chip surface. The larger output aperture of VCSELs, compared to most edge-emitting lasers, produces a lower divergence angle of the output beam, and makes https://www.inphenix.com/en/vertical-cavity-surface-emitting-laser-vcsel/

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