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- W2560633512 abstract "The generation of a coherent state, supporting a large photon number, with controlled orbital-angular-momentum L = ħl (of charge l per photon) presents both fundamental and technological challenges: we demonstrate a surface-emitting laser, based on III-V semiconductor technology with an integrated metasurface, generating vortex-like coherent state in the Laguerre-Gauss basis. We use a first order phase perturbation to lift orbital degeneracy of wavefunctions, by introducing a weak anisotropy called here orbital birefringence, based on a dielectric metasurface. The azimuthal symmetry breakdown and non-linear laser dynamics create orbital gain dichroism allowing selecting vortex handedness. This coherent photonic device was characterized and studied, experimentally and theoretically. It exhibits a low divergence (<1°) diffraction limited beam, emitting 49 mW output power in the near-IR at λ ≃ 1 μm, a charge l = ±1, … ±4 (>50 dB vortex purity), and single frequency operation in a stable low noise regime (0.1% rms). Such high performance laser opens the path to widespread new photonic applications." @default.
- W2560633512 created "2016-12-16" @default.
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- W2560633512 date "2016-12-05" @default.
- W2560633512 modified "2023-10-06" @default.
- W2560633512 title "Vortex Laser based on III-V semiconductor metasurface: direct generation of coherent Laguerre-Gauss modes carrying controlled orbital angular momentum" @default.
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- W2560633512 doi "https://doi.org/10.1038/srep38156" @default.
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