Self-focusing and channel-coupling effects on short laser pulses propagating in a plasma channel

2004 ◽  
Vol 11 (6) ◽  
pp. 3259-3263 ◽  
Author(s):  
Pallavi Jha ◽  
Navina Wadhwani ◽  
Ajay. K. Upadhyaya ◽  
Gaurav Raj
Keyword(s):  
Plasma Channel ◽  
Laser Pulses ◽  
Coupling Effects ◽  
Channel Coupling ◽  
Self Focusing ◽  
Short Laser Pulses

scholarly journals Ionization-induced leaking-mode channeling of intense short laser pulses in gases

1999 ◽  
Vol 17 (1) ◽  
pp. 129-138 ◽  
Author(s):  
A.M. SERGEEV ◽  
M. LONTANO ◽  
A.V. KIM ◽  
V.B. GILDENBURG ◽  
M.D. CHERNOBROVTSEVA ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Plasma Channel ◽  
Computational Study ◽  
Laser Pulses ◽  
Ultrashort Laser Pulses ◽  
Short Laser Pulse ◽  
Saturation Regime ◽  
Short Laser Pulses ◽  
Ultrashort Laser ◽  
Guiding Effect

We demonstrate that short laser pulse self-guiding over distances of many Rayleigh lengths can be achieved in the absence of any focusing nonlinearity as a result of trapping of a leaking wave in a plasma channel produced by field-induced ionization in the saturation regime. A detailed computational study of the new self-guiding effect in both cases of comparatively long laser pulses, when the traditional approximation of the slowly varying complex amplitude is valid, and of high intense ultrashort laser pulses comprising only few field cycles have been performed.

Self-focusing and the initial stages of plasma generation by short laser pulses

1978 ◽  
Vol 29 (2) ◽  
pp. 357-357
Author(s):  
J. E. Balmer ◽  
T. P. Donaldson ◽  
J. A. Zimmermann
Keyword(s):  
Laser Pulses ◽  
Plasma Generation ◽  
Self Focusing ◽  
Short Laser Pulses

scholarly journals X-ray spectroscopy observation of fast ions generation in plasma produced by short low-contrast laser pulse irradiation of solid targets

2007 ◽  
Vol 25 (2) ◽  
pp. 267-275 ◽  
Author(s):  
A.YA. Faenov ◽  
A.I. Magunov ◽  
T.A. Pikuz ◽  
I. YU. Skobelev ◽  
S.V. Gasilov ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Laser Intensity ◽  
Laser Pulses ◽  
Intense Laser ◽  
Low Contrast ◽  
X Ray ◽  
Fast Ions ◽  
Self Focusing ◽  
Short Laser Pulses ◽  
Charged Ions

X-ray spectra of plasma produced by the interaction of Ti:Sa laser pulses (duration from 60 fs to 1 ps, and energy from 15 mJ to 128 mJ) with foil and solid Teflon and AL targets are investigated. It is shown experimentally and theoretically that the use of low contrast (10−2 – 10−4) short laser pulses, essentially promotes the conditions for generation of fast multi-charged ions. This effect is caused by self-focusing of the main laser pulse in a preplasma produced by intense laser prepulses. Modeling of the observed spectral line shape gives evidence of a considerable (about 3%) amount of multi-charged He-like F ions with energy E ∼ 1 MeV at rather low values of laser intensity IL ≈ 6 × 1016 W cm−2.

INTERACTION OF INTENSE SHORT LASER PULSES WITH AIR AND DIELECTRIC MATERIALS

2007 ◽  
Vol 21 (03n04) ◽  
pp. 615-625 ◽  
Author(s):  
S. EISENMANN ◽  
Y. KATZIR ◽  
A. ZIGLER ◽  
G. FIBICH ◽  
E. LOUZON ◽  
...  
Keyword(s):  
Critical Power ◽  
Laser Pulses ◽  
Dielectric Materials ◽  
Laser Beams ◽  
Threshold Fluence ◽  
Short Pulses ◽  
Self Focusing ◽  
Chirped Pulses ◽  
Short Laser Pulses ◽  
Wide Gap

A study of the propagation of intense short laser pulses in air and the interaction of these pulses with distant targets is described. It is shown that the beam filamentation pattern can be controlled by introducing beam astigmatism. In addition, it is demonstrated that the collapse distance of intense femtosecond laser beams scales as P -1/2 for input powers that are moderately above the critical power for self focusing, and that at higher powers the collapse distance scales as P -1. Related to the interaction of intense short pulses with distant targets, it is measured that the threshold fluence for optical damage in wide gap materials is lower by up to 20% for negatively chirped pulses than for positively chirped, at pulse durations ranging from 60 fs to 1 ps.

Self-focusing and the initial stages of plasma generation by short laser pulses

1978 ◽  
Vol 24 (1) ◽  
pp. 109-112 ◽  
Author(s):  
J.E. Balmer ◽  
T.P. Donaldson ◽  
W. Seka ◽  
J.A. Zimmermann
Keyword(s):  
Laser Pulses ◽  
Plasma Generation ◽  
Self Focusing ◽  
Short Laser Pulses

scholarly journals Wakefield effects on the evolution of symmetric laser pulses in a plasma channel

2010 ◽  
Vol 28 (2) ◽  
pp. 245-251 ◽  
Author(s):  
Pallavi Jha ◽  
Amita Malviya ◽  
Ajay K. Upadhyay
Keyword(s):  
Laser Pulse ◽  
Evolution Equations ◽  
Plasma Channel ◽  
Pulse Length ◽  
Laser Pulses ◽  
Spot Size ◽  
Propagation Characteristics ◽  
Short Laser Pulses ◽  
Parabolic Plasma ◽  
Laser Pulse Length

AbstractThe present study deals with the propagation of short laser pulses in a parabolic plasma channel. A variational technique is used to obtain simultaneous evolution equations describing the laser pulse length and spot size in the presence of relativistic and ponderomotive nonlinearities. The effect of wakefields (inside the pulse) on the propagation characteristics of the laser beam is studied. Numerical methods are used to graphically analyze the evolution of the laser pulse length and intensity.

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