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Wavemeter calibration by frequency comb.

Patrick F Egan1

  • 1National Institute of Standards and Technology, 100 Bureau Dr, Gaithersburg, MD 20899, United States of America.

Metrologia
|January 15, 2025
PubMed
Summary
This summary is machine-generated.

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The National Institute of Standards and Technology upgraded its vacuum wavelength calibration service with an optical frequency comb for enhanced traceability. This expansion now includes calibration for telecom wavelengths, improving wavemeter accuracy.

Area of Science:

  • Metrology and Optical Physics
  • Advanced Instrumentation for Wavelength Calibration

Background:

  • The National Institute of Standards and Technology (NIST) provides essential vacuum wavelength calibration services.
  • Historically, calibration covered red and green interferometry wavelengths.
  • Existing services required expansion to meet evolving technological needs.

Purpose of the Study:

  • To report upgrades to the NIST vacuum wavelength calibration service.
  • To introduce new calibration capabilities for the telecommunications wavelength range.
  • To enhance traceability to the International System of Units (SI) second.

Main Methods:

  • Utilized an optical frequency comb as the centerpiece instrumentation.
  • Stabilized the optical frequency comb to a Global Positioning System (GPS)-disciplined oscillator.
Keywords:
frequency combvacuum wavelengthwavemeter calibration

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  • Expanded calibration to include wavemeters in the (1520 < lambda < 1570) nm telecom range.

    • Main Results:

    • Achieved direct traceability to the SI second through GPS-disciplined frequency comb stabilization.
    • Successfully added calibration capability for multiple telecom wavelengths.
    • Demonstrated a test uncertainty ratio of approximately 10^4 for most commercial wavemeters.

    Conclusions:

    • The upgraded NIST service offers enhanced accuracy and traceability for wavelength calibration.
    • The expansion to telecom wavelengths supports advancements in optical communications and metrology.
    • The new capabilities provide a valuable resource for calibrating advanced wavemeters.