Coherent control of stimulated Raman scattering using chirped laser pulses

Dodd, E. S.; Umstadter, Donald

doi:10.1063/1.1382820

Cited by 46 publications

(38 citation statements)

References 22 publications

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“…Previous theoretical work by Dodd and Umstadter 15 on Raman scattering of a chirped laser pulse used a heuristic calculation of the group velocity dispersion (GVD) to estimate the effect of a linear frequency chirp. Dodd and Umstadter claimed that, in the nonrelativistic regime (a 0 1), the amount of chirp necessary to eliminate the Raman scattering instability We find, for a 20% negative chirp (∆ e = 0.2), the growth rate in the four-wave resonant regime at the center of the pulse is reduced by only 4.7% compared to the unchirped growth rate.…”

Section: Discussion and Summarymentioning

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: Discussion and Summarymentioning

confidence: 99%

“…In addition, two-dimensional particle-in-cell (PIC) computer simulations presented in Ref. 15 claim enhancement of Raman forward scattering instabilities for positively-chirped laser pulses, however, these simulations assumed a large bandwidth (20%), an order of magnitude beyond that used in present-day experiments [12][13][14] .…”

Section: Introductionmentioning

confidence: 99%

Raman forward scattering of chirped laser pulses

et al. 2003

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“…As shown in Fig. 1, a positive chirp (c) is found to increase the growth of Raman-driven plasma waves as compared with no chirp (a); a negative chirp (b) is found to decrease it [6]. In the LWFA, an electron plasma wave is driven resonantly by a short laser pulse (T ~ i p ) through the laser ponderomotive force.…”

Section: Electron Accelerationmentioning

confidence: 92%

“…It has been shown analytically and numerically that controlled injection might also be accomplished by means internal electrons, from the plasma itself, which are all put into the accelerating phase of the plasma wave by a separate laser pulse [11,2]. Such a laser-driven plasma-cathode electron gun might eventually have (1) monoenergetic energy, (2) GeV/cm acceleration fields, (3) micron source size, (4) femtosecond pulse duration, (5) high brightness, (6) absolute synchronization between electrons and laser (for pump and probe experiments) and (7) compact size (university-lab scale).…”

Section: Optical Injectionmentioning

confidence: 99%

Developments in relativistic nonlinear optics

Umstadter¹,

Banerjee²,

Chen³

et al. 2002

AIP Conference Proceedings

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Abstract. We report recent results of experiments and simulations in the regime of peak laser intensities above 10 19 W/cm 2 , including the following topics: (1) electron and proton acceleration to energies in excess of 10 MeV in well collimated beams; (2) use of laser chirp to control the growth of plasma waves and acceleration of electrons by the Raman instability; (3) all optical injection and acceleration of electrons; (4) relativistic self-focusing by means of the mutual index of refraction of two overlapping laser pulses; (5) creation of a radioisotope by the reaction 10 B(d,n) n C; (6) high-order harmonic generation from relativistic free electrons in an underdense plasma.

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“…In addition, twodimensional particle-in-cell (PIC) computer simulations presented in Ref. [15] claim enhancement of Raman forward scattering instabilities for positively-chirped laser pulses, however, these simulations assumed a large bandwidth (20%), an order of magnitude beyond that used in present-day experiments [12,13,14].…”

Section: Introductionmentioning

confidence: 99%

Raman Forward Scattering of High-Intensity Chirped Laser Pulses

Schroeder¹,

Esarey²,

Shadwick³

et al. 2002

AIP Conference Proceedings

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Abstract. Raman forward 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. Relation of these results to recent experiments is discussed.

show abstract

Coherent control of stimulated Raman scattering using chirped laser pulses

Cited by 46 publications

References 22 publications

Raman forward scattering of chirped laser pulses

Raman forward scattering of chirped laser pulses

Developments in relativistic nonlinear optics

Raman Forward Scattering of High-Intensity Chirped Laser Pulses

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