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The propagation of light in moving media is dragged by atomic motion. Thelight-drag effect can be dramatically enhanced by reducing the group velocitywith electro-magnetically induced transparency (EIT). We develop a systematicprocedure to accurately reconstruct the complex wavefront of the slow lightwith single-shot measurements, enabling precise, photon shot-noise limitedspectroscopic measurements of atomic response across EIT even in presence ofgeneric atomic number fluctuations. Applying the technique to an expandingcloud of cold atoms, we demonstrate simultaneous inference of the atomicdensity distribution and the velocity field from the complex imaging data. Thisinline imaging technique may assist a wide range of cold atom experiments toaccess spectroscopic and phase space information with in situ and minimallydestructive measurements.

Imaging moving atoms by holographically reconstructing the dragged slow light