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Development of Whispering Gallery Mode Polymeric Micro-optical Electric Field Sensors
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Single and coupled cavity mode sensing schemes using a diagnostic field.

Aaron W Goodwin-Jones, Haochen Zhu, Carl Blair

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    A novel optical mode sensing scheme simplifies spatial mode matching in quantum experiments. This technique, using a diagnostic field, enhances squeezed-vacuum state applications in gravitational-wave detectors.

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    Area of Science:

    • Quantum optics
    • Optical metrology

    Background:

    • Precise optical mode matching is crucial for squeezed-vacuum states in quantum experiments.
    • Existing automatic spatial-mode matching schemes can reduce losses and improve stability.
    • Mode matching sub-cavities is also essential for quantum-enhanced coupled-cavity systems like gravitational-wave detectors.

    Purpose of the Study:

    • To propose a new, simplified mode sensing scheme for both simple and coupled cavities.
    • To enable routine use of high squeezing levels in gravitational-wave detectors.

    Main Methods:

    • A diagnostic field tuned to the HG20/LG10 mode frequency is employed.
    • The scheme eliminates the need for moving parts or Gouy phase tuning.
    • Error signals are derived, proportional to differences in waist position and Rayleigh ranges of sub-cavity eigenmodes.

    Main Results:

    • The proposed scheme generates separable error signals (90-degree demodulation phase).
    • Reasonable error signals were demonstrated for a simplified Einstein Telescope optical design.
    • The method is applicable to both simple and coupled cavities.

    Conclusions:

    • This new mode sensing scheme offers a robust and simplified approach to optical mode matching.
    • It facilitates the practical implementation of advanced quantum technologies in sensitive instruments like gravitational-wave detectors.