Dark matter Axion search with riNg Cavity Experiment DANCE: Design and development of auxiliary cavity for simultaneous resonance of linear polarizations

• Main Authors: Fujimoto, Hiroki, Oshima, Yuka, Ando, Masaki, Fujita, Tomohiro, Michimura, Yuta, Nagano, Koji, Obata, Ippei
• Format: Journal Article
• Language: English
• Published: 22-10-2021
• Subjects: Physics - High Energy Physics - Experiment; Physics - Instrumentation and Detectors; Physics - Instrumentation and Methods for Astrophysics
• DOI: 10.48550/arxiv.2110.12023

Axion-like particles (ALPs) are undiscovered pseudo-scalar particles that are
candidates for ultralight dark matter. ALPs interact with photons slightly and
cause the rotational oscillation of linearly polarized light. Dark matter Axion
search with riNg Cavity Experiment (DANCE) searches for ALP dark matter by
amplifying the rotational oscillation with a bow-tie ring cavity. Simultaneous
resonance of linear polarizations is necessary to amplify both the carrier
field and the ALP signal, and to achieve the design sensitivity. The
sensitivity of the current prototype experiment DANCE Act-1 is less than
expectation by around three orders of magnitude due to the resonant frequency
difference between s- and p-polarization in the bow-tie ring cavity. In order
to tune the resonant frequency difference, the method of introducing an
auxiliary cavity was proposed. We designed an auxiliary cavity that can cancel
out the resonant frequency difference and realize simultaneous resonance,
considering optical loss. We also confirmed that the sensitivity of DANCE Act-1
with the auxiliary cavity can reach the original sensitivity.