Self-focusing and Raman scattering of laser pulses in tenuous plasmas

Antonsen, Thomas M.; Mora, P.

doi:10.1103/physrevlett.69.2204

Cited by 357 publications

(160 citation statements)

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“…Several regimes of RFS can be identified [19][20][21] , and, as the instability grows, it passes through these various regimes depending on the value of |ζ|/τ and the intensity of the incident laser pulse a 0 . Past analytical analysis on Raman instabilities [19][20][21] has primarily focused on nonrelativistic laser-plasma interactions where a 0 1.…”

Section: Raman Forward Scatteringmentioning

confidence: 99%

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Raman forward scattering of chirped laser pulses

et al. 2003

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Raman scattering of a high-intensity, short-duration, frequency-chirped laser pulse propagating in an underdense plasma is examined. The growth of the direct forward scattered light is calculated for a laser pulse with a linear frequency chirp in various spatiotemporal regimes. This includes a previously undescribed regime of strongly-coupled four-wave nonresonant interaction, which is important for relativistic laser intensities. In all regimes of forward scattering, it is shown that the growth rate increases (decreases) for positive (negative) frequency chirp. The effect of chirp on the growth rate is relatively minor, i.e., a few percent chirp yields few percent changes in the growth rates. Numerical solutions based on a fully nonlinear cold Maxwell-fluid model are presented which confirm analytical predictions. Relation of these results to recent experiments is discussed.

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Section: Raman Forward Scatteringmentioning

confidence: 99%

“…Past analytical analysis on Raman instabilities [19][20][21] has primarily focused on nonrelativistic laser-plasma interactions where a 0 1. In this work we perform a relativistic analysis of the linear RFS spatiotemporal growth rates including a correlated frequency chirp.…”

Section: Raman Forward Scatteringmentioning

confidence: 99%

Raman forward scattering of chirped laser pulses

et al. 2003

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“…On the other hand, self-modulated LWFA [11][12][13][14][15][16][17][18][19][20] normally requires laser pulse lengths substantially longer than 2 ps. Longer pulses allow the wake to grow via Raman forward scattering or a resonant modulation instability within the laser pulse envelope.…”

Section: Introductionmentioning

confidence: 99%

Modeling of laser wakefield acceleration atCO2laser wavelengths

Andreev

Kuznetsov

Pogosova

et al. 2003

Phys. Rev. ST Accel. Beams

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The upgraded Accelerator Test Facility (ATF) CO 2 laser located at Brookhaven National Laboratory offers a unique opportunity to investigate laser wakefield acceleration (LWFA) with a 10:6-m laser, a wavelength where little experimental work exists. While long laser wavelengths have certain advantages over short wavelengths, our modeling analysis has uncovered another important effect. The upgraded ATF CO 2 laser will have a pulse length as short as 2 ps. At a nominal plasma density of 10 16 cm ÿ3 , this pulse length would normally be considered too long for resonant LWFA, but too short for self-modulated LWFA. However, our model simulations indicate that a well-formed wakefield is nevertheless generated with electric field gradients of E z * 2 GV=m assuming 2.5 TW laser peak power. The model indicates pulse steepening is occurring due to various nonlinear effects. It is possible that this intermediate laser pulse length mode of operation may permit the creation of well-formed, regular-shaped wakefields, which would be needed for staging the LWFA process. Discussed in this paper are the model, its predictions for an LWFA experiment at the ATF, and the pulse steepening effect.

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“…p . In previous experiments performed with similar parameters [20], plasma waves were observed to be driven by the self-modulated wakefield mechanism [21][22][23]. Images of crossed plasma channels were observed with top and side imaging of Thomson scattering and recorded by a CCD camera.…”

mentioning

confidence: 99%