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Related Experiment Video

Updated: Jun 19, 2026

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
12:19

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Published on: April 4, 2017

T violation and microhertz resolution in a ring laser.

G E Stedman, M T Johnsson, Z Li

    Optics Letters
    |October 28, 2009
    PubMed
    Summary

    A Helium-Neon ring laser precisely measured Earth

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    Area of Science:

    • Physics
    • Optical Engineering
    • Geophysics

    Background:

    • The Sagnac effect, a consequence of Earth's rotation, influences light propagation in ring lasers.
    • Detecting subtle symmetry violations requires highly precise measurements.

    Purpose of the Study:

    • To measure the Earth-rotation-induced Sagnac frequency with high precision using a He-Ne ring laser.
    • To explore the potential of ring laser systems for detecting ultrasmall symmetry violations.

    Main Methods:

    • Utilized a Helium-Neon (He-Ne) ring laser.
    • Measured the beat frequency generated by the Sagnac effect.

    Main Results:

    • Achieved a precision of 1 microHz for the Sagnac frequency.
    • This precision corresponds to 2 parts in 10^8 relative to the laser frequency.
    • The measurement represents 2 x 10^-21 of the laser frequency.

    Conclusions:

    • Ring laser systems demonstrate potential for detecting ultrasmall symmetry violations.
    • The observed beat frequency is linked to time-reversal or parity-violating effects.

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