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High precision optical cavity length and width measurements using double modulation.

A Staley, D Hoak, A Effler

    Optics Express
    |September 15, 2015
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a precise method using doubly phase modulated light to measure optical resonator length and linewidth. The technique achieves high accuracy for length measurements, demonstrating potential for improved cavity width determination.

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    Area of Science:

    • Optics
    • Precision Measurement
    • Resonator Technology

    Background:

    • Optical resonators are crucial components in various scientific applications.
    • Accurate measurement of resonator length and linewidth is essential for performance optimization.
    • Existing methods may face limitations in precision or susceptibility to errors.

    Purpose of the Study:

    • To develop a high-precision technique for measuring optical resonator length and linewidth.
    • To demonstrate the effectiveness of doubly phase modulated light for these measurements.
    • To analyze systematic errors and identify areas for improvement.

    Main Methods:

    • Utilizing doubly phase modulated light with radio frequency (RF) and audio frequency modulations.
    • Demodulating transmitted or reflected light while sweeping RF frequency across optical resonance.
    • Deriving expressions for demodulated power and identifying zero crossings for linewidth measurement.

    Main Results:

    • Achieved absolute length accuracy as low as 70 parts per billion (ppb) for cavities up to 4 km.
    • Determined the cavity width of a 16 m cavity with an accuracy of approximately 6000 ppm.
    • Identified systematic errors indicating potential for substantial accuracy improvement.

    Conclusions:

    • The developed technique offers high precision for optical resonator length metrology.
    • The method provides a reliable way to measure cavity linewidth.
    • Further reduction of technical uncertainties can significantly enhance measurement accuracy.