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Applied Optics_CMS_paper

The Macek and Davis experiment revisited: A large ring laser interferometer operating on the 2s² -> 2p⁴ transition of neon

New paper published in Applied Optics featuring our xtal stable™ optics employed in a large-area ring laser gyroscope

We are proud to announce a new publication entitled, “The Macek and Davis experiment revisited: A large ring laser interferometer operating on the 2s2→2p4 transition of neon,” featuring our xtal stable mirrors employed in a large-area near-infrared laser gyroscope.

This effort, led by collaborators at the Dodd-Walls Centre for Photonic and Quantum Technologies and the University of Canterbury in New Zealand, as well as TU Munich and the Geodetic Observatory Wettzell in Germany, was published in the January 10th issue of Applied Optics (2019). In this experiment, our collaborators operated a 1 m2 HeNe-based ring laser interferometer with GaAs/AlGaAs crystalline coatings as the end mirrors at a wavelength of 1.15 μm, exploring the various operating regimes of the laser under different gas compositions and pressures. We are very excited about future developments in high-sensitivity geodesy and inertial navigation systems employing our groundbreaking semiconductor supermirror technology!

Find the full article here.


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 1.152276 μm. For either single longitudinal- or phase-locked multi-mode operation, the preferable gas composition for gyroscopic operation is 0.2 and 0.3 mbar of 50:50 neon with total pressures between 6–12 mbar. The Earth rotation bias is sufficient to unlock the device, yielding a Sagnac frequency of approximately 60 Hz.

© 2019 Optical Society of America