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Optimization of plasma amplifiers.

James D Sadler1, Raoul M G M Trines2, Max Tabak3

  • 1Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom.

Physical Review. E
|June 17, 2017
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Summary
This summary is machine-generated.

Plasma amplifiers achieve high-power laser pulses by compressing long pulses using Raman instabilities. Optimal seed pulse parameters are crucial for efficient energy transfer and high-power laser generation.

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Area of Science:

  • Plasma physics
  • Laser science
  • High-energy physics

Background:

  • Chirped pulse amplification faces limitations in generating extreme power laser pulses.
  • Plasma amplifiers offer an alternative approach to overcome these limitations.

Purpose of the Study:

  • To conduct an extensive numerical study of plasma amplifiers using the Raman instability.
  • To identify optimal seed pulse parameters for efficient laser pulse compression.
  • To evaluate the performance of plasma amplifiers under experimentally relevant conditions.

Main Methods:

  • Extensive kinetic numerical simulations of the three-dimensional parameter space for Raman amplification.
  • Particle-in-cell simulations to determine optimal seed pulse parameters.
  • Analysis of transverse coherence and energy efficiency.

Main Results:

  • High-efficiency self-similar behavior observed for seed pulses shorter than the linear Raman growth time.
  • Demonstrated maintenance of good transverse coherence and high-energy efficiency in a test case.
  • Successful compression of a 10 kJ, nanosecond-long driver pulse in a 15 cm amplifier.

Conclusions:

  • Plasma amplifiers, particularly via Raman instability, are a viable path to the laser power frontier.
  • Optimizing seed pulse characteristics is key to achieving efficient and coherent laser pulse compression.
  • These findings support the development of next-generation high-power laser systems.