Parametric co-linear axion photon instability

Beyer, K. A. and Marocco, G. and Danson, C. and Bingham, R. and Gregori, G. (2023) Parametric co-linear axion photon instability. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 839. 137759. ISSN 0370-2693 (https://doi.org/10.1016/j.physletb.2023.137759)

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Abstract

Axions and axion-like particles generically couple to QED via the axion-photon-photon interaction. This leads to a modification of Maxwell's equations known in the literature as axion-electrodynamics. The new form of Maxwell's equations gives rise to a new parametric instability in which a strong pump decays into a scattered light wave and an axion. This axion mode grows exponentially in time and leads to a change in the polarisation of the initial laser beam, therefore providing a signal for detection. Currently operating laser systems can put bounds on the axion parameter space, however longer pulselengths are necessary to reach the current best laboratory bounds of light-shining through wall experiments.

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