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High-precision wavelength measurement using a virtual Fizeau cavity.

Yixuan Liu, Shibang Ma, Kun Yang

    Optics Letters
    |December 15, 2023
    PubMed
    Summary

    A new virtual Fizeau cavity (VFC) method enhances wavelength measurement accuracy for laser technology and optical metrology. This innovative approach overcomes limitations of traditional Fizeau wavemeters, achieving superior precision.

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    Area of Science:

    • Optics and Photonics
    • Metrology

    Background:

    • Fizeau wavelength measurement is crucial for laser technology, optical communication, and metrology.
    • Traditional Fizeau wavemeters face accuracy limitations due to cavity length variations affecting stripe symmetry and finesse.

    Purpose of the Study:

    • To introduce a novel virtual Fizeau cavity (VFC) method for high-accuracy wavelength measurements.
    • To address the limitations of traditional Fizeau wavemeters.

    Main Methods:

    • Development of a virtual Fizeau cavity (VFC) based on the principle of phase difference.
    • Principle analysis, simulation, and experimental verification of the VFC method.

    Main Results:

    • The VFC method demonstrates feasibility and high performance.
    • Achieved wavelength measurement accuracy superior to 60 MHz across the 350-1100 nm range.
    • Introduced a novel "virtual-real combined" cavity design concept.

    Conclusions:

    • The VFC method offers a significant improvement over traditional Fizeau wavemeters.
    • The proposed "virtual-real combined" cavity design opens new avenues for developing highly accurate Fizeau wavelength measurement systems.