Abstract
We report on the operation of a helium-neon based large ring laser gyroscope on the shortest wavelength neon laser transition at 543.5 nm. Owing to the fact that this 3s2→2p10 transition has a factor of 30 less gain than the commonly used 632.8 nm neon transition, an approximately 40 cm long, 3 mm diameter gain tube was required. Despite this, the 6.4 metre perimeter gyroscope unlocked on the bias provided by Earth rotation alone; exhibiting a Sagnac frequency near 133 Hz.
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