First Results from the Axion Dark-Matter Birefringent Cavity (ADBC) Experiment

Axions and axionlike particles are strongly motivated dark-matter candidates that are the subject of many current ground based dark-matter searches. We present first results from the Axion Dark-Matter Birefringent Cavity (ADBC) experiment, which is an optical bow-tie cavity probing the axion-induced birefringence of electromagnetic waves. Our experiment is the first optical axion detector that is tunable and quantum noise limited, making it sensitive to a wide range of axion masses. We have iteratively probed the axion mass ranges 40.9-43.3 neV/c², 49.3-50.6 neV/c², and 54.4-56.7 neV/c², and found no dark-matter signal. On average, we constrain the axionlike particle and photon coupling at the level gaγγ≤1.9×10⁻⁸ GeV⁻¹. We also present prospects for future axion dark-matter detection experiments using optical cavities.