Raman Amplification with a Flying Focus

Turnbull, D.; Bucht, S.; Davies, Andrew; Haberberger, D.; Kessler, T. J.; Shaw, Jessica; Froula, D. H.

doi:10.1103/physrevlett.120.024801

Cited by 65 publications

(36 citation statements)

References 28 publications

(56 reference statements)

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“…The way the plasma responds to an external excitation and couples to it, fully characterizes the performances of a plasma amplifier. The schemes proposed and studied so far exploiting an electron or ion response of the plasma (resonant Raman [1][2][3], chirped pump Raman [4,5], Raman with flying focus [6], diverging Raman [7], multi-frequency Raman [8], plasma wave seed for Raman [9], single-pulse Raman [10], stronglycoupled Brillouin [11], single-pulse Brillouin [12], fewcycle laser amplification by Brillouin [14]) have explored different parameter ranges and beam configurations in order to optimize (or minimize) a particular aspect of the amplification. Each scheme, according to which type of plasma excitation is exploited, has been put forward as the most appropriate for a specific purpose.…”

Section: Introductionmentioning

confidence: 99%

Joule-Level High-Efficiency Energy Transfer to Subpicosecond Laser Pulses by a Plasma-Based Amplifier

et al. 2019

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Laser plasma amplification of sub-picosecond pulses above the Joule level is demonstrated, a major milestone for this scheme to become a solution for the next-generation of ultra-high intensity lasers. By exploring over 6 orders of magnitude the influence of the incident seed intensity on Brillouin laser amplification, we reveal the importance of a minimum intensity to ensure an early onset of the self-similar regime, and a large energy transfer with a very high efficiency, up to 20%. Evidence of energy losses of the seed by spontaneous backward Raman is found at high amplification. The first three-dimensional envelope simulations of the sub-picosecond amplification were performed, supplemented by one-dimensional PIC simulations. Comparisons with the experimental results demonstrate the capability of quantitative predictions on the transferred energy. The global behavior of the amplification process, is reproduced, including the evolution of the spatial profile of the amplified seed.

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Section: Introductionmentioning

confidence: 99%

Joule-Level High-Efficiency Energy Transfer to Subpicosecond Laser Pulses by a Plasma-Based Amplifier

et al. 2019

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“…Stimulated Raman scattering (SRS), the decay of the incident laser into a scattered light and an electron plasma wave [26,27], is an important mechanism in plasma optics [28], and also one of the key concerns in ICF [1,3,29]. SRS in the relativistic regime is described by the following dispersion relation [30,31]…”

Section: Theoretical Analysismentioning

confidence: 99%

Plasma modulator for high-power intense lasers

et al. 2020

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A type of plasma-based optical modulator is proposed for the generation of broadband high-power laser pulses. Compared with normal optical components, plasma-based optical components can sustain much higher laser intensities. Here we illustrate via theory and simulation that a high-power sub-relativistic laser pulse can be self-modulated to a broad bandwidth over 100% after it passes through a tenuous plasma. In this scheme, the self-modulation of the incident picoseconds sub-relativistic pulse is realized via stimulated Raman forward rescattering in the quasi-linear regime, where the stimulated Raman backscattering is heavily dampened. The optimal laser and plasma parameters for this self-modulation have been identified. For a laser with asub-relativistic intensity of I ∼ 10 17 W/cm 2 , the time scale for the development of self-modulation is around 10 3 light periods when stimulated Raman forward scattering has been fully developed. Consequently, the spatial scale required for such a self-modulation is in the order of millimeters. For a tenuous plasma, the energy conversion efficiency of this self-modulation is around 90%. Theoretical predictions are verified by both one-dimensional and two-dimensional particle-in-cell simulations.

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“…Above all, magnetized plasmas as a restoring medium have unique strengths in manipulating intense laser pulses. Importantly, an intense laser pulse can be further amplified by nonlinear effects in a plasma [12][13][14][15][16] . In particular, a weakly relativistic laser pulse can be intensified via the process of self-compression in a plasma 36 .…”

Section: Theoretical Analysismentioning

confidence: 99%

Simultaneous polarization transformation and amplification of multi-petawatt laser pulses in magnetized plasmas

et al. 2019

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1With increasing laser peak power, the generation and manipulation of high-power laser pulses becomes a growing challenge for conventional solid-state optics due to their limited damage threshold. As a result, plasma-based optical components which can sustain extremely high fields are attracting increasing interest. Here, we propose a type of plasma waveplate based on magneto-optical birefringence under a transverse magnetic field, which can work under extremely high laser power. Importantly, this waveplate can simultaneously alter the polarization state and boost the peak laser power. It is demonstrated numerically that an initially linearly polarized laser pulse with 5 petawatt peak power can be converted into a circularly polarized pulse with a peak power higher than 10 petawatts by such a waveplate with a centimeter-scale diameter. The energy conversion efficiency of the polarization transformation is about 98%. The necessary waveplate thickness is shown to scale inversely with plasma electron density n e and the square of magnetic field B 0 , and it is about 1 cm for n e = 3 × 10 20 cm −3 and B 0 = 100 T. The proposed plasma waveplate and other plasma-based optical components can play a critical role for the effective utilization of multi-petawatt laser systems.

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Raman Amplification with a Flying Focus

Cited by 65 publications

References 28 publications

Joule-Level High-Efficiency Energy Transfer to Subpicosecond Laser Pulses by a Plasma-Based Amplifier

Joule-Level High-Efficiency Energy Transfer to Subpicosecond Laser Pulses by a Plasma-Based Amplifier

Plasma modulator for high-power intense lasers

Simultaneous polarization transformation and amplification of multi-petawatt laser pulses in magnetized plasmas

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