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7 March 2017 Low-noise III-V metasurface based semiconductor vortex laser and rotational Doppler velocimetry
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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.24 We use a first order phase perturbation to introduce a weak orbital anisotropy, based on a dielectric metasurface and non-linear laser dynamics, allowing selecting vortex handedness. Moreover, similarly to linear Doppler Shift, light carrying orbital angular momentum L, scattered by a rotating object at angular velocity, experiences a rotational Doppler shift L. We show that this fundamental light matter interaction can be detected exploiting self-mixing in a vortex laser under Doppler-shifted optical feedback, with quantum noise-limited light detection.25 This will allow us to combine a velocity sensor with optical tweezers for micro-manipulation applications, with high performances, simplicity and compactness. Such high performance laser opens the path to widespread new photonic applications.
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Mohamed Seghilani, Baptiste Chomet, Mikhael Myara, Mohamed Sellahi, Luc Legratiet, Gregoire Beaudoin, Isabelle Sagnes, Philippe Lalanne, and Arnaud Garnache "Low-noise III-V metasurface based semiconductor vortex laser and rotational Doppler velocimetry", Proc. SPIE 10087, Vertical External Cavity Surface Emitting Lasers (VECSELs) VII, 100870C (7 March 2017);

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