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Algorithm for supersonic gas jet density profile retrieval from interferometric measurement.

Journal of the Optical Society of America. A, Optics, image science, and visionยท2019
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Optimization of a multibeam-pumped optical parametric amplifier.

Stanislav A Frolov, Vladimir I Trunov

    Applied Optics
    |October 20, 2017
    PubMed
    Summary

    Numerical simulations show that increasing pump beams in laser systems minimally impacts femtosecond pulse duration but reduces amplification efficiency, especially with coherent pumping. This research optimizes pump beam angles for powerful laser output.

    Area of Science:

    • Nonlinear Optics
    • Laser Physics
    • Computational Physics

    Background:

    • Powerful laser systems often utilize parametric amplification for generating ultrashort pulses.
    • Optimizing amplification efficiency and pulse characteristics is crucial for high-energy laser applications.
    • Numerical simulations are essential for understanding complex laser dynamics.

    Purpose of the Study:

    • To present numerical simulation results for a powerful laser's output amplifier cascade.
    • To introduce an improved method for selecting pump beam angles to minimize parasitic amplification.
    • To analyze the impact of multiple pumping beams on femtosecond pulse amplification in LiB3O5 crystals.

    Main Methods:

    • Numerical simulation of parametric amplification in a Lithium Triborate (LiB3O5) crystal.

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  • Comparison of carrier-resolving and envelope simulation techniques.
  • Analysis of amplified pulse energy, duration, and parasitic energy fraction under varying pump beam configurations.

    • Main Results:

    • Amplified pulse duration increased slightly (20-21 fs for incoherent, to 26 fs for coherent pumping) with up to 11 pump beams.
    • Amplification efficiency decreased from 23% to 21% (incoherent) and to 10% (coherent pumping) with more pump beams.
    • The study discusses the influence of self-focusing on peak intensity.

    Conclusions:

    • Increasing the number of pump beams offers limited benefits for pulse duration but significantly impacts amplification efficiency.
    • The choice between coherent and incoherent pumping strategies affects both pulse duration and efficiency.
    • The presented technique aids in optimizing pump beam geometry for powerful femtosecond laser systems.