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Offset-free broadband Yb:fiber optical frequency comb for optical clocks.

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    |September 15, 2015
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    We developed a stabilized optical frequency comb using difference frequency generation (DFG) for precise optical clock comparisons. This Yb:fiber laser-based comb offers broad spectral coverage and high power, ideal for strontium and mercury atomic clocks.

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    Area of Science:

    • Physics
    • Quantum Optics
    • Laser Technology

    Background:

    • Optical frequency combs are crucial for high-precision measurements.
    • Stabilizing optical frequency combs is essential for advanced applications like optical clocks.
    • Previous methods often involve complex stabilization schemes.

    Purpose of the Study:

    • To demonstrate a passively offset-frequency stabilized optical frequency comb.
    • To achieve stabilization using difference frequency generation (DFG) for simplified control.
    • To assess the comb's suitability for comparing optical clocks.

    Main Methods:

    • Utilized a Yb:fiber laser to generate a supercontinuum.
    • Employed difference frequency generation (DFG) between two supercontinuum portions to create the comb.
    • Locked one comb mode to an ultra-stable continuous wave (CW) laser for full stabilization.

    Main Results:

    • Achieved a passively offset-frequency stabilized optical frequency comb centered at 1060 nm.
    • The comb exhibited a broad spectrum from 690 nm to 1300 nm.
    • Obtained several hundred milliwatts of average power, suitable for amplification and spectral broadening.

    Conclusions:

    • The demonstrated DFG comb offers a simplified stabilization approach.
    • The comb's characteristics make it highly suitable for comparing optical clocks, including Sr and Hg.
    • This work advances the development of precise metrology tools for fundamental physics research.