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arXiv · 2510.01221

WISPFI Experiment: Prototype Development

Josep Maria Batllori·Michael Frosz·Dieter Horns·Marios Maroudas
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Abstract

Axions and axion-like particles (ALPs) are well-motivated dark matter (DM) candidates that couple to photons in external magnetic fields. The parameter space around $m_a \sim 50~\mu$eV remains largely unexplored by haloscope experiments. We present the first prototype of WISP Searches on a Fiber Interferometer (WISPFI), a table-top, model-independent scheme based on resonant photon-axion conversion in a hollow-core photonic crystal fiber (HC-PCF) integrated into a Mach-Zehnder interferometer (MZI). Operating near a dark fringe with active phase-locking, combined with amplitude modulation, the interferometer converts axion-induced photon disappearance into a measurable signal. A 2 W, 1550 nm laser is coupled into a 1 m-long HC-PCF placed inside a 2 T permanent magnet array, probing a fixed axion mass of $m_a \simeq 49~$meV with a projected sensitivity of $g_{a\gamma\gamma} \gtrsim 1.3 \times 10^{-9}~\text{GeV}^{-1}$ for a measurement time of 30 days. Future upgrades, including pressure tuning of the effective refractive index and implementation of a Fabry-P\'erot cavity, could extend the accessible mass range and improve sensitivity, establishing WISPFI as a scalable platform to explore previously inaccessible regions of the axion parameter space.

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Josep Maria Batllori, Michael Frosz, Dieter Horns, Marios Maroudas. 2025-09-22. WISPFI Experiment: Prototype Development. https://arxiv.org/abs/2510.01221

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