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High-contrast plasma-electrode Pockels cell.

B E Kruschwitz1, J H Kelly, M J Shoup Iii

  • 1Laboratory Laser Energetics University of Rochester, Rochester, New York 14623-12299, USA. bkru@lle.rochester.edu

Applied Optics
|February 24, 2007
PubMed
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A novel plasma-electrode Pockels cell (PEPC) offers high-contrast optical switching for laser systems. Its design minimizes stress-induced birefringence, ensuring reliable isolation from retroreflected pulses.

Area of Science:

  • Laser-induced fusion and high-power laser systems.
  • Optical physics and materials science.
  • Plasma physics and engineering.

Background:

  • High-power laser systems require effective optical switches for isolation.
  • Plasma-electrode Pockels cells (PEPCs) are utilized for optical switching.
  • OMEGA EP laser system demands high-contrast isolation for retroreflected pulses.

Purpose of the Study:

  • To develop and characterize a PEPC for the OMEGA EP laser system.
  • To achieve high-contrast optical switching for system isolation.
  • To investigate the impact of window mounting and operating pressure on PEPC performance.

Main Methods:

  • Development of a PEPC utilizing circular windows supported on compliant O rings.
  • Testing under vacuum loading conditions to assess stress-induced birefringence.

Related Experiment Videos

  • Evaluation of contrast ratios across the clear aperture.
  • Analysis of PEPC operation at various pressures to determine optimal conditions.

    • Main Results:

    • Contrast ratios reliably exceeded 500:1 across the clear aperture.
    • The use of compliant O rings significantly reduced stress-induced birefringence under vacuum.
    • Reliable operation was achieved at higher operating pressures.
    • Low operating pressures correlated with local plasma density loss.

    Conclusions:

    • The developed PEPC provides effective high-contrast optical switching for the OMEGA EP laser system.
    • The innovative window mounting technique is crucial for minimizing optical aberrations.
    • Optimized operating pressure is essential for stable plasma density and reliable PEPC performance.