Abstract
We operate a large helium-neon-based ring laser interferometer with single-crystal GaAs/AlGaAs optical coatings on the 2s2→2p4 transition of neon at a wavelength of 1.152276μm. For either single longitudinal- or phase-locked multi-mode operation, the preferable gas composition for gyroscopic operation is 0.2 and 0.3mbar of 50:50 neon with total pressures between 6-12mbar. The Earth rotation bias is sufficient to unlock the device, yielding a Sagnac frequency of approximately 60Hz.
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