Abstract
We have built and tested a 3.5 m high-finesse Fabry–Perot prototype interferometer with a precision ellipsometer for the QED test and axion search (Q&A) experiment. We use X-pendulum–double-pendulum suspension designs and automatic control schemes developed by the gravitational-wave detection community. The Verdet constant and Cotton–Mouton constant of the air are measured as a test. Double modulation with polarization modulation 100 Hz and magnetic-field modulation 0.05 Hz gives 10−7 rad phase noise for a 44 min integration.
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