This thesis describes one of the most precise experimental tests of
Lorentz symmetry in electrodynamics by light-speed anisotropy
measurement with an asymmetric optical ring cavity. The author aims
to answer the fundamental, hypothetical debate on Lorentz symmetry
in the Universe. He concludes that the symmetry is protected within
an error of 10-15, which means providing one of the most stringent
upper limits on the violation of the Lorentz symmetry in the
framework of the Standard Model Extension. It introduces the
following three keys which play an important role in achieving
high-precision measurement: (1) a high-index element (silicon)
interpolated into part of the light paths in the optical ring
cavity, which improves sensitivity to the violation of the Lorentz
symmetry, (2) double-pass configuration of the interferometer,
which suppresses environmental noises, and (3) continuous data
acquisition by rotating the optical ring cavity, which makes it
possible to search for higher-order violations of Lorentz symmetry.
In addition to those well-described keys, a comprehensive summary
from theoretical formulations to experimental design details, data
acquisition, and data analysis helps the reader follow up the
experiments precisely.
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