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Related Experiment Video

Updated: Jul 12, 2025

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

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High power optical frequency comb with 10-19 frequency instability.

Xiaodong Shao, Hainian Han, Huibo Wang

    Optics Express
    |October 20, 2023
    PubMed
    Summary

    High-power fiber chirped pulse amplification (CPA) frequency combs now exceed 20 W, enabling new applications. This advancement achieves unprecedented optical frequency stability for ultra-long-distance time and frequency transfer.

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    Area of Science:

    • * Physics
    • * Optics
    • * Spectroscopy

    Background:

    • * High-power optical frequency combs are crucial for applications like extreme ultraviolet generation and nuclear clocks.
    • * Ultra-long-distance time and frequency transfer using dual-comb systems demand enhanced power scaling and frequency stability.
    • * Existing high-power combs face limitations in power and stability for advanced applications.

    Purpose of the Study:

    • * To develop a high-power frequency comb system exceeding 20 W output power.
    • * To investigate and minimize noise contributions within the amplifier stages.
    • * To achieve unprecedented optical frequency stability for demanding applications.

    Main Methods:

    • * Employed fiber chirped pulse amplification (CPA) for power scaling.

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    Last Updated: Jul 12, 2025

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  • * Characterized amplifier noise by comparing two optical locking techniques.
  • * Measured out-of-loop frequency instability using two identical high-power combs via heterodyning.

    • Main Results:

    • * Demonstrated a fiber CPA frequency comb with over 20 W output power.
    • * Achieved an out-of-loop beat note frequency stability of 4.35 × 10-17 at 1s.
    • * Reached a stability of 6.54 × 10-19 at 1000s, showcasing unprecedented performance.

    Conclusions:

    • * The developed 20 W fiber CPA frequency comb offers significant power scaling.
    • * Low-noise CPA, effective locking, and controlled amplifiers are key to high stability.
    • * This high-power, stable comb advances ultra-long-distance time/frequency transfer and related fields.