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Lett."],"published-print":{"date-parts":[[2025,6,15]]},"abstract":"<jats:p>Large-scale laser gyroscopes with high resolution are widely used in Earth rotation sensing and geophysical detection. We demonstrate a giant 64 m<jats:sup>2<\/jats:sup> green laser gyroscope in a passive running mode. By adopting a heterolithic architecture and using a 532 nm solid state laser as the light source, the gyroscope demonstrates a short wavelength, a large-scale factor, and currently the highest <jats:italic toggle=\"yes\">Q<\/jats:italic>-factor of 6\u2009\u00d7\u200910<jats:sup>12<\/jats:sup> among existing gyroscopes. A minimum sensitivity of 7\u00d710<jats:sup>\u221211<\/jats:sup>rad\/s\/Hz is achieved, which is the best performance among passive ring gyroscopes (PRGs) to the best of our knowledge. This high sensitivity allows detection of terrestrial secondary microseismic signal at about 0.25 Hz, demonstrating the application value of large-scale PRGs in the field of geophysics. 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All rights, including for text and data mining (TDM), Artificial Intelligence (AI) training, and similar technologies, are reserved.","name":"copyright","label":"Copyright"}]}}