Probing the spatial distribution of k-vectors in situ with Bose-Einstein condensates

• URL: http://arxiv.org/abs/2507.19157v1
• Date: Fri, 25 Jul 2025 10:58:58 GMT
• Title: Probing the spatial distribution of k-vectors in situ with Bose-Einstein condensates
• Authors: Samuel Gaudout, Rayan Si-Ahmed, Clément Debavelaere, Menno Door, Pierre Cladé, Saïda Guellati-Khelifa,
• Abstract summary: We present a novel method for mapping in situ the spatial distribution of photon momentum across a laser beam using a Bose-Einstein condensate (BEC) as a moving probe.<n>By displacing the BEC, we measure the photon recoil by atom interferometry at different positions in the laser beam.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We present a novel method for mapping in situ the spatial distribution of photon momentum across a laser beam using a Bose-Einstein condensate (BEC) as a moving probe. By displacing the BEC, we measure the photon recoil by atom interferometry at different positions in the laser beam and thus reconstruct a two-dimensional map of the local intensity and effective dispersion of the $k$ wave vector. Applied to a beam diffracted by a diaphragm, this method reveals a local extra recoil effect, which exceeds the magnitude $h\nu/c$ of the individual plane-waves over which the beam can be decomposed. This method offers a new way to precisely characterize wavefront distortions and to evaluate one of the major systematic bias sources in quantum sensors based on atom interferometry.

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