Seed Laser Chirping for Enhanced Backward Raman Amplification in Plasmas

Toroker, Z.; Malkin, V. M.; Fisch, Nathaniel J.

doi:10.1103/physrevlett.109.085003

Cited by 50 publications

(40 citation statements)

References 29 publications

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“…2c. The increased prominence of the first spike of the amplified pulse is comparable to that predicted by Toroker et al 29 when a chirped seed pulse is used. For the steady-state amplifier, the amplitude duration product is modified to…”

Section: Resultssupporting

confidence: 73%

Advantages to a diverging Raman amplifier

Sadler¹,

Silva²,

Fonseca³

et al. 2018

Commun Phys

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The plasma Raman instability can efficiently compress a nanosecond long high-power laser pulse to sub-picosecond duration. Although, many authors envisaged a converging beam geometry for Raman amplification, here we propose the exact opposite geometry; the amplification should start at the intense focus of the seed. We generalise the coupled laser envelope equations to include this non-collimated case. The new geometry completely eradicates the usual trailing secondary peaks of the output pulse, which typically lower the efficiency by half. It also reduces, by orders of magnitude, the initial seed pulse energy required for efficient operation. As in the collimated case, the evolution is self similar, although the temporal pulse envelope is different. A two-dimensional particle-in-cell simulation demonstrates efficient amplification of a diverging seed with only 0.3 mJ energy. The pulse has no secondary peaks and almost constant intensity as it amplifies and diverges.

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Section: Resultssupporting

confidence: 73%

Advantages to a diverging Raman amplifier

Sadler¹,

Silva²,

Fonseca³

et al. 2018

Commun Phys

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“…1 in Ref. [31]). On the other hand, pump detuning is effective for small densities (ω e < 0.1ω b ), where the group velocity dispersion does not shadow the relativistic nonlinearity (see Fig.…”

Section: Detuning In Dispersive Mediummentioning

confidence: 99%

“…One might imagine that we may combine seed chirping [31] with pump detuning in order to reduce the amplification time and therefore to improve the efficiency of the detuned BRA. However, these two methods operate in different regimes.…”

Section: Detuning In Dispersive Mediummentioning

confidence: 99%

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Beyond nonlinear saturation of backward Raman amplifiers

et al. 2016

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Backward Raman amplification is limited by relativistic nonlinear dephasing resulting in saturation of the leading spike of the amplified pulse. Pump detuning is employed to mitigate the relativistic phase mismatch and to overcome the associated saturation. The amplified pulse can then be reshaped into a mono-spike pulse with little precursory power ahead of it, with the maximum intensity increasing by a factor of two. This detuning can be employed advantageously both in regimes where the group velocity dispersion is unimportant and where the dispersion is important but small.

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“…[1][2][3][4][5][6][7][8] Lots of developments of ultrashort high power lasers have been carried out with progress in ultrashort laser technologies such as chirped pulse amplification. [9][10][11][12][13] The interaction of an intense short laser pulse with under dense plasma can produce accelerating gradients, thousands of times, higher than conventional accelerators. [14][15][16] Plasma wake can travel at the group velocity of laser pulse, close to the speed of light, in order to accelerate particles up to relativistic velocities.…”

Section: Introductionmentioning

confidence: 99%

Effect of nonlinear chirped Gaussian laser pulse on plasma wake field generation

Afhami

Eslami

2014

AIP Advances

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An ultrashort laser pulse propagating in plasma can excite a nonlinear plasma wake field which can accelerate charged particles up to GeV energies within a compact space compared to the conventional accelerator devices. In this paper, the effect of different kinds of nonlinear chirped Gaussian laser pulse on wake field generation is investigated. The numerical analysis of our results depicts that the excitation of plasma wave with large and highly amplitude can be accomplished by nonlinear chirped pulses. The maximum amplitude of excited wake in nonlinear chirped pulse is approximately three times more than that of linear chirped pulse. In order to achieve high wake field generation, chirp parameters and functions should be set to optimal values.

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Seed Laser Chirping for Enhanced Backward Raman Amplification in Plasmas

Cited by 50 publications

References 29 publications

Advantages to a diverging Raman amplifier

Advantages to a diverging Raman amplifier

Beyond nonlinear saturation of backward Raman amplifiers

Effect of nonlinear chirped Gaussian laser pulse on plasma wake field generation

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