Abstract
Light carrying orbital angular momentum , scattered by a rotating object at angular velocity , experiences a rotational Doppler shift . 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. We used a low-noise relaxation oscillation-free (class–A) vortex laser, based on III-V semiconductor vertical-external-cavity-surface-emitting laser technology to generate coherent Laguerre–Gauss beams carrying (). Linear and rotational Doppler effects were studied experimentally and theoretically. This will allow us to combine a velocity sensor with optical tweezers for micro-manipulation applications, with high performances: compact, powerful , high-quality beam, auto-aligned, linear response up to or , low back-scattered light detection limit .
© 2015 Optical Society of America
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