Echo Doppler with structured light

Abstract

When a light beam with a transverse spatially - varying phase is considered for optical remote sensing, in addition to the usual longitudinal Doppler freq uency shift of the returned signal induced by the motion of the scatter along the beam axis, a new transversal Doppler shift appears which is due to the motion of the scatterer in the plane perpendicular to the beam axis. We discuss here how this new effec t can be used to enhance the current capabilities of optical remote sensing systems, adding the capacity to detect more complex movements of scatters.