Plasma channel formation by short pulse laser

Annou, R.; Tripathi, V. K.; Srivastava, M. P.

doi:10.1063/1.871727

Cited by 23 publications

(9 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Under the action of the ponderomotive force, electrons and ions move together at the ion sound speed c s ; thus, the characteristic time for the manifestation of the ponderomotive nonlinearity is r 0 /c s , where r 0 is the beam width. Additional phenomena contributing to the (de)focusing of an electromagnetic beam in a plasma are multiphoton (tunnel) ionization (Annou et al, 1996), avalanche ionization (Stuart et al, 1996;Derenzo et al, 1974), harmonic generation (Sodha & Kaw, 1969), modification (Gurevich, 1978) of electron density, and nonlinear absorption (Sharma et al, 2004). All these forms of nonlinearity are present and operate in various relative strengths in different regimes in terms of the irradiance, electron density, electron collision frequency, and duration of the pulse of the beam.…”

Section: Introductionmentioning

confidence: 98%

Spatial evolution of a q-Gaussian laser beam in relativistic plasma

Sharma

Kourakis

2010

Laser Part. Beams

View full text Add to dashboard Cite

In a recent experimental study, the beam intensity profile of the Vulcan petawatt laser beam was measured; it was found that only 20% of the energy was contained within the full width at half maximum of 6.9 μm and 50% within 16 μm, suggesting a long-tailed non-Gaussian transverse beam profile. A q-Gaussian distribution function was suggested therein to reproduce this behavior. The spatial beam profile dynamics of a q-Gaussian laser beam propagating in relativistic plasma is investigated in this article. A non-paraxial theory is employed, taking into account nonlinearity via the relativistic decrease of the plasma frequency. We have studied analytically and numerically the dynamics of a relativistically guided beam and its dependence on the q-parameter. Numerical simulation results are shown to trace the dependence of the focusing length on the q-Gaussian profile.

show abstract

Section: Introductionmentioning

confidence: 98%

Spatial evolution of a q-Gaussian laser beam in relativistic plasma

Sharma

Kourakis

2010

Laser Part. Beams

View full text Add to dashboard Cite

show abstract

“…Liu and Tripathi (1994) have examined the selfdefocusing of ionizing short laser pulse and laser guidance in the inhomogeneous tunnel ionized plasma channel. The theory of plasma expansion under the influence of the ponderomotive force due to inhomogeneous laser intensity profile has been developed by Annou et al (1996). Deng et al (2003) have studied the effect of tunnel ionization on the wakefield generation and concluded that the influence of tunnel ionization cannot be ignored for short laser pulses.…”

Section: Introductionmentioning

confidence: 99%

Effect of electron-ion recombination on self-focusing/defocusing of a laser pulse in tunnel ionized plasmas

et al. 2013

Self Cite

View full text Add to dashboard Cite

A formalism for investigation of the propagation characteristics of various order short duration (pico second) Gaussian/ dark hollow Gaussian laser pulse (DHGP) in a tunnel ionized plasma has been developed, which takes into account the electron-ion recombination. Utilizing the paraxial like approach, a nonlinear Schrödinger wave equation characterizing the beam spot size in space and time has been derived and solved numerically to investigate the transverse focusing (in space) and longitudinal compression (in time) of the laser pulse; the associated energy localization as the pulse advances in the plasma has also been analyzed. It is seen that in the absence of recombination the DHGP and Gaussian pulse undergo oscillatory and steady defocusing respectively. With the inclusion of recombination, the DHGP and Gaussian pulse both undergo periodic self-focusing for specific parameters. The DHGPs promise to be suitable for enhancement of energy transport inside the plasma.

show abstract

“…They have also examined the propagation of the laser main pulse, in the steady state, through the inhomogeneous plasma channel created by the prepulse. Annou and Tripathi 12 have developed a theory of plasma expansion under the ponderomotive force of a laser.…”

Section: Introductionmentioning

confidence: 99%

Two-dimensional effects in a tunnel ionized plasma

1997

Self Cite

View full text Add to dashboard Cite

An intense short pulse laser of finite spot size propagating through a gas produces plasma via tunnel ionization on a femtosecond time scale. The radial profile of plasma density is strongly peaked on the axis and has a defocusing property. As electron density grows with time, the trailing part of the laser pulse suffers stronger divergence than the leading front, causing severe temporal distortion of the pulse. A self-consistent paraxial ray theory of electron density evolution and defocusing of the laser reveals that a square (in time) laser pulse, after propagating one Rayleigh length, has an order of magnitude difference in the axial intensity at the front and the tail of the pulse.

show abstract

Plasma channel formation by short pulse laser

Cited by 23 publications

References 7 publications

Spatial evolution of a q-Gaussian laser beam in relativistic plasma

Spatial evolution of a q-Gaussian laser beam in relativistic plasma

Effect of electron-ion recombination on self-focusing/defocusing of a laser pulse in tunnel ionized plasmas

Two-dimensional effects in a tunnel ionized plasma

Contact Info

Product

Resources

About