High-power in-phase coherently coupled VCSEL array based on proton implantation

Three-element in-phase coherently coupled arrays of vertical cavity surface-emitting lasers (VCSELs) were fabricated using proton implantation. The arrays show excellent beam quality with a far-field divergence of 4°, while maintaining a stable in-phase mode until a maximum output power of 4 mW under continuous-wave condition. The process for the arrays is simple and the cost is low.

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