Amplification of 1 ps Pulse Length Beam by Stimulated Raman Scattering of a 1 ns Beam in a Low Density Plasma (original) (raw)
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Laser Pulse Compression in Plasma Using Coherent Raman Cascade
OSA Technical Digest (CD) (Optical Society of America, 2005), paper JThD4., 2005
Compressing laser beams in plasmas via coherent Raman sideband generation is proposed. Electron density perturbations driven by the laser beatwave broaden the laser spectrum. Chirped beatnotes are compressed in plasma with high group velocity dispersion.
Detuned Raman Amplification of Short Laser Pulses in Plasma
Physical Review Letters, 2000
The recently proposed scheme of so-called "fast compression" of laser pulses in plasma can increase peak laser intensities by 10 5 [ Phys. Rev. Lett. 82, 4448 (1999)]. The compression mechanism is the transient stimulated Raman backscattering, which outruns the fastest filamentation instabilities of the pumped pulse even at highly overcritical powers. This Letter proposes a novel nonlinear filtering effect that suppresses premature backscattering of the pump in a noisy plasma layer, while the desired amplification of a sufficiently intense seed persists with a high efficiency. The effect is of basic interest and also makes it robust to noise the simplest technologically fast compression scheme.
Physical Review Letters, 2009
We report on highly time-and space-resolved measurements of the evolution of electron plasma waves driven by stimulated Raman scattering of a picosecond, single laser speckle propagating through a preformed underdense plasma. Two-dimensional Thomson scatter spectra indicate that the dominant waves have significant transverse components. These results are supported by particle-in-cell simulations which pinpoint the dominant role of the wave front bowing and of secondary nonlinear electrostatic instabilities in the evolution of the plasma waves.
Physics of Plasmas, 2018
Taking into account the nonlinear dispersion of the plasma wave, the fluid equations for the threewave (Raman) interaction in plasma are derived. It is found that, in some parameter regimes, the nonlinear detuning resulting from the plasma wave dispersion during Raman compression limits the plasma wave amplitude to noticeably below the generally recognized wavebreaking threshold. Particle-in-cell simulations confirm the theoretical estimates. For weakly nonlinear dispersion, the detuning effect can be counteracted by pump chirping or, equivalently, by upshifting slightly the pump frequency, so that the frequency-upshifted pump interacts with the seed at the point where the plasma wave enters the nonlinear stage.
Electron Acceleration and the Propagation of Ultrashort High-Intensity Laser Pulses in Plasmas
Physical Review Letters, 2000
Reported are interactions of high-intensity laser pulses (l 810 nm and I # 3 3 10 18 W͞cm 2 ) with plasmas in a new parameter regime, in which the pulse duration (t 29 fs) corresponds to 0.6 -2.6 plasma periods. Relativistic filamentation is observed to cause laser-beam breakup and scattering of the beam out of the vacuum propagation angle. A beam of megaelectronvolt electrons with divergence angle as small as 1 ± is generated in the forward direction, which is correlated to the growth of the relativistic filamentation. Raman scattering, however, is found to be much less than previous longpulse results.