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Related Experiment Videos

Laser pulse-stretching with multiple optical ring cavities.

Jun Kojima1, Quang-Viet Nguyen

  • 1National Aeronautics and Space Administration, Glenn Research Center, Cleveland, Ohio 44135, USA.

Applied Optics
|October 25, 2002
PubMed
Summary
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Researchers developed a passive nanosecond laser pulse stretcher using optical ring cavities. This technology extends laser pulse duration for applications like spontaneous Raman scattering, preventing plasma spark issues.

Area of Science:

  • Optics and Photonics
  • Laser Physics

Background:

  • Nanosecond pulsed lasers are crucial for various scientific applications.
  • Achieving longer pulse durations often requires complex or active systems.
  • Laser-induced plasma formation can be a limiting factor in high-intensity applications.

Purpose of the Study:

  • To develop a simple, passive method for stretching nanosecond laser pulses.
  • To present a comprehensive model for optical ring cavity pulse stretchers.
  • To optimize a pulse stretcher design for spontaneous Raman-scattering excitation systems.

Main Methods:

  • Utilized multiple optical ring cavities in a passive configuration.
  • Developed a mathematical model accounting for cavity delay, beam-splitter reflectivity, and spatial profile.

Related Experiment Videos

  • Optimized the stretcher design based on the developed model.

    • Main Results:

    • Demonstrated a three-cavity pulse stretcher converting an 8.4-ns pulse to ~75-ns (FWHM).
    • Achieved 83% efficiency with a peak power reduction factor of 0.10x.
    • Validated the pulse-stretching model through experimental results.

    Conclusions:

    • The proposed optical ring cavity system offers an effective passive solution for nanosecond laser pulse stretching.
    • The developed model accurately predicts pulse-stretching performance and aids in design optimization.
    • This technique mitigates laser-induced plasma issues, enhancing applicability in spontaneous Raman scattering.