Short Bragg pulse spectroscopy for a paraxial fluids of light

Abstract

We implement Bragg spectroscopy in a paraxial fluid of light. Analogues of short Bragg pulses are imprinted on a photon fluid by wavefront shaping using a spatial light modulator. We measure the dispersion relation and evidence a parabolic single-particle regime as well as a linear phonon regime even for very weakly interacting photons and low sound velocity. Finally, we report a measurement of the static structure factor, $S(k)$, and we demonstrate the presence of pair-correlated excitations, revealing indirectly the quantum depletion in a paraxial fluid of light.

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• Non-equilibrium pre-thermal states in a two-dimensional photon fluid
• Dissipation-enhanced collapse singularity of a nonlocal fluid of light in a hot atomic vapor
• Observation of Jones-Roberts solitons in a paraxial quantum fluid of light
• Spin and Density Modes in a Binary Fluid of Light
• Paraxial fluids of light
• Analogue gravitational lensing in optical Bose-Einstein condensates
• Bound Bogoliubov quasiparticles in photon superfluids