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Pulsed mid-infrared radiation from spectral broadening in laser wakefield simulations
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10.1063/1.4813245
/content/aip/journal/pop/20/7/10.1063/1.4813245
http://aip.metastore.ingenta.com/content/aip/journal/pop/20/7/10.1063/1.4813245
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Top: laser intensity and electron density as functions of channel radius rand ξ at propagation distances of z = 0.0, left, and 4.9 mm, right. Bottom: Wigner distributions of the laser pulse as a function of normalized wavenumber and at the same propagation distances.

Image of FIG. 2.
FIG. 2.

Characteristic wavenumber ⟨k⟩/k as a function of distance z for initial pulse powers of 17, 40, and 60 TW, represented by red, blue, and black, respectively. The inset shows a comparison with linear theory (dashed lines) for each case.

Image of FIG. 3.
FIG. 3.

Spectral energy density of a pulse propagating in a plasma channel as a function of k/k at distances z = 0, 2.5, 4.9, and 7.9 mm, represented by the red, grey, dark grey, and black lines, respectively; spectral energy density for a pulse propagating through a uniform plasma (no channel) is represented by the blue curve. The red arrow indicates where λ = 4.7 m.

Image of FIG. 4.
FIG. 4.

Cumulative energy as a function of k/k at distances z = 0, 2.5, 4.9, and 7.9 mm, represented by the red, grey, dark grey, and black curves, respectively; cumulative energy for the no channel case at z = 7.9 mm represented by the blue curve. The red arrow indicates there are 15 mJ of cumulative energy at λ = 4.7 m.

Image of FIG. 5.
FIG. 5.

(a) Retrieved profile of the filtered mid-IR pulse (0 < k < 0.2 k) radially averaged intensity as a function of (z,ξ). (b) and (c) Filtered mid-IR pulse (0 < k < 0.2 k) as a function of (r,ξ) at distances z = 7.9 and 8.4 mm.

Image of FIG. 6.
FIG. 6.

(a) Cumulative energy at largest characteristic wavenumber shift as a function of k/k for initial powers P = 40 TW for the channeled (black, solid) and non-channeled (black, dashed) cases and 17 TW for the channeled (grey, solid) and non-channeled (grey, dashed) cases. (b) Mid-IR generation efficiency as a function of initial pulse power for λ ≥ 6 m, λ ≥ 4 m, and λ ≥ 2 m.

Image of FIG. 7.
FIG. 7.

MIR conversion efficiency in the ranges λ ≥ 6 m, λ ≥ 4 m, and λ ≥ 2 m as a function of initial temporal FWHM. The upper and lower dashed lines show the effect of negative and positive chirp, respectively.

Image of FIG. 8.
FIG. 8.

MIR conversion efficiency in the ranges λ ≥ 6 m, λ ≥ 4 m, and λ ≥ 2 m as a function of on-axis plasma density.

Image of FIG. 9.
FIG. 9.

Fractional difference in cumulative energies resulting from FWE and MPE approaches ((U-U)/U) as a function of k/k for a 30 fs, 40 TW pulse propagating in a plasma channel.

Image of FIG. 10.
FIG. 10.

Normalized frequency, ω/kc, as a function of normalized wavenumber shift δk/k from the MPE solver (red), FWE solver (blue), and theory (black).

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/content/aip/journal/pop/20/7/10.1063/1.4813245
2013-07-09
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Pulsed mid-infrared radiation from spectral broadening in laser wakefield simulations
http://aip.metastore.ingenta.com/content/aip/journal/pop/20/7/10.1063/1.4813245
10.1063/1.4813245
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