Speaker
Description
Axions and axion-like particles (ALPs) can couple to photons, and many searches have been conducted utilizing the Primakoff effect, which induces axion-photon conversion under magnetic fields. Recently, novel experiments using the interaction between axions and laser photons without magnetic fields have been proposed and are currently underway. These experiments aim to search for ALPs directly by using optical cavities to amplify and detect the rotation of linearly polarized light induced by the axion-photon interaction. We have proposed Dark matter Axion search with riNg Cavity Experiment (DANCE), which employs a bow-tie ring cavity composed of four mirrors to detect the amplified polarization rotation angle. In order to conduct a sensitive broadband search, the incident s-polarization and p-polarization generated by the polarization rotation need to be resonant in the cavity simultaneously. However, our first observation revealed that both s- and p-polarizations were not resonant in the cavity due to oblique incidence on the mirrors, degrading the sensitivity over a wide range of axion masses. By employing a novel method utilizing zero phase shift mirrors and a wavelength tunable laser, we have successfully demonstrated the simultaneous resonance of s- and p-polarizations. We report on the latest sensitivity and future prospects.
| Main Contribution topic | Axion / Sterile |
|---|---|
| Secondary contribution topic | Instrumentation for Dark Matter |