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Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators
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Raman amplification in the coherent wave-breaking regime.

J P Farmer1, A Pukhov1

  • 1Theoretische Physik I, Heinrich Heine Universität, 40225 Düsseldorf, Germany.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|January 15, 2016
PubMed
Summary
This summary is machine-generated.

We discovered a new, high-efficiency "coherent wave-breaking" (CWB) regime for Raman amplification. This transient regime, accessed with short, intense probes, allows for the highest total energy transfer in plasma wave interactions.

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Area of Science:

  • Plasma Physics
  • Laser-Plasma Interactions
  • Nonlinear Optics

Background:

  • Raman amplification is a key process in laser-plasma interactions.
  • Wave breaking typically limits the efficiency of energy transfer.
  • Understanding nonlinear effects beyond the wave-breaking threshold is crucial.

Purpose of the Study:

  • To investigate Raman amplification regimes beyond the standard wave-breaking threshold.
  • To identify and characterize a novel, high-efficiency amplification regime.
  • To explore the role of probe pulse characteristics in energy transfer.

Main Methods:

  • Simulations of laser-plasma interactions.
  • Parameter scans varying pump intensity, probe characteristics, and plasma parameters.
  • Analysis of energy transfer efficiency and plasma wave dynamics.

Main Results:

  • Significant amplification occurs transiently after wave breaking onset.
  • A
  • coherent wave-breaking
  • (CWB) regime was identified, yielding higher total energy transfer.
  • Short, intense probes are essential for accessing the CWB regime.

Conclusions:

  • The CWB regime offers a pathway to enhanced energy transfer in Raman amplification.
  • Transient effects and probe characteristics are critical factors in nonlinear plasma processes.
  • This work expands the understanding of energy transfer mechanisms in laser-driven plasmas.