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Updated: Feb 17, 2026

Quasi-light Storage for Optical Data Packets
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Delay line coherent pulse stacking.

Henrik Tünnermann, Akira Shirakawa

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    |December 8, 2017
    PubMed
    Summary

    This study presents a direct pulse stacking method for ultrafast fiber amplifiers, enhancing energy efficiency. The technique optimizes seed power utilization and avoids gain asymmetry issues common in other methods.

    Area of Science:

    • Optics and Photonics
    • Laser Technology
    • Ultrafast Science

    Background:

    • Ultrafast fiber amplifiers face limitations in pulse energy and peak power due to fiber damage and nonlinearities.
    • Fiber amplifiers offer high energy efficiency, making them attractive for scaling pulse energy.
    • Coherent combining and pulse stacking are established methods to overcome energy limitations in fiber amplifiers.

    Purpose of the Study:

    • To demonstrate a direct and symmetrical pulse stacking method for ultrafast fiber amplifiers.
    • To leverage the energy efficiency of fiber amplifiers while scaling pulse energy.
    • To overcome limitations associated with existing pulse stacking and amplification techniques.

    Main Methods:

    • Utilizing delay lines and phase preshaping for pulse stacking.

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  • Employing a 48 MHz, 1.5 μm master oscillator.
  • Directly stacking pulses from an oscillator chain without high-power dumpers.

    • Main Results:

    • Achieved direct and symmetrical stacking of pulses from an oscillator chain.
    • Eliminated the need for high-power low-loss dumpers found in passive cavities.
    • Avoided pulse splitting, picking, and asymmetrical gain issues inherent in divided pulse amplification (DPA).
    • Optimally utilized available seed power for efficient amplification.

    Conclusions:

    • The developed pulse stacking method offers an efficient way to scale pulse energy in ultrafast fiber amplifiers.
    • This technique provides advantages over passive stack-and-dump cavities and divided pulse amplification (DPA).
    • The method ensures symmetrical gain, enhancing overall amplifier efficiency and performance.