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Updated: Mar 21, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Frequency comb metrology with an optical parametric oscillator.

K Balskus, S Schilt, V J Wittwer

    Optics Express
    |May 4, 2016
    PubMed
    Summary

    We demonstrate absolute frequency comb metrology using an optical parametric oscillator (OPO) frequency comb. This novel approach achieved high accuracy in measuring optical frequencies, comparable to commercial fiber combs.

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    Area of Science:

    • Quantum Optics
    • Metrology
    • Laser Physics

    Background:

    • Optical frequency combs are essential tools for high-precision measurements.
    • Optical parametric oscillators (OPOs) offer unique spectral flexibility for comb generation.

    Purpose of the Study:

    • To demonstrate absolute frequency comb metrology using a synchronously-pumped OPO.
    • To characterize the noise properties and optical linewidth of the OPO frequency comb.
    • To measure the absolute optical frequency of a rubidium (Rb) transition using the OPO comb.

    Main Methods:

    • Synchronously-pumped OPO operation in the 1.5-µm spectral region.
    • Referencing the OPO comb to an H-maser atomic clock.
    • Characterization of frequency noise power spectral density (PSD) for repetition rate (frep) and carrier-envelope offset frequency (fCEO).

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    Last Updated: Mar 21, 2026

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  • Locking the carrier envelope offset frequency with minimal residual phase noise.
  • Measuring the absolute optical frequency of a near-infrared laser locked to the 87Rb D2 line.

    • Main Results:

    • The OPO comb's optical linewidth at 1557 nm was determined to be ~70 kHz, limited by the microwave frequency standard.
    • A tight lock of fCEO was achieved with ~300 mrad residual integrated phase noise.
    • The absolute optical frequency of the 87Rb D2 line was measured as νRb = 384,228,115,346 ± 16 kHz.
    • Performance of the OPO comb was comparable to a commercial fiber-laser comb.

    Conclusions:

    • The first demonstration of absolute frequency comb metrology with an OPO frequency comb was successful.
    • OPO-based frequency combs show promise for high-accuracy optical measurements.
    • Measurement accuracy was ultimately limited by interferometric noise in the setup.