Superradiating 4P-4S-3P cascade of sodium vapour arising on the leading edge of the exciting laser pulse

1994 ◽  
Vol 59 (6) ◽  
pp. 649-653 ◽  
Author(s):  
Z. Kuprionis ◽  
V. Švedas
Keyword(s):  
Laser Pulse ◽  
Leading Edge ◽  
Sodium Vapour

Interaction of a non-symmetric powerful laser pulse with a plasma

1998 ◽  
Vol 59 (1) ◽  
pp. 57-68 ◽  
Author(s):  
D. P. GARUCHAVA ◽  
I. G. MURUSIDZE ◽  
G. I. SURAMLISHVILI ◽  
N. L. TSINTSADZE ◽  
D. D. TSKHAKAYA
Keyword(s):  
Analytical Solution ◽  
Laser Pulse ◽  
Ion Channel ◽  
Leading Edge ◽  
Point Of View ◽  
Powerful Laser ◽  
Physical Point ◽  
Electron Bunches ◽  
Rear Edge ◽  
Powerful Laser Pulse

The interaction of a powerful non-symmetric laser pulse with a plasma is studied. The non-symmetry is manifested in an abrupt cut-off of the rear edge of the laser pulse compared with its leading edge. At the same time, three qualitatively different regions are distinguished: the leading edge, the rear edge and the region behind the pulse, where it leaves a wake in the form of generated fields. An analytical solution has been found that defines the longitudinal accelerating field at the end of the rear edge. The results of numerical calculations confirm our physical point of view that the non-symmetry of the laser pulse increases the duration of the ion channel behind the front, thereby enhancing the focusing and effective acceleration of electron bunches.

Clustered gases as a medium for efficient plasma waveguide generation

2006 ◽  
Vol 364 (1840) ◽  
pp. 647-661 ◽  
Author(s):  
H.M Milchberg ◽  
K.Y Kim ◽  
V Kumarappan ◽  
B.D Layer ◽  
H Sheng
Keyword(s):  
Laser Pulse ◽  
Bessel Beam ◽  
Leading Edge ◽  
Plasma Waveguide ◽  
Gas Jets ◽  
Cool Plasma ◽  
Beam Pump ◽  
Guided Propagation ◽  
Long Pulse ◽  
Disassembly Time

Clustered gas jets are shown to be an efficient means for plasma waveguide generation, for both femtosecond and picosecond generation pulses. These waveguides enable significantly lower on-axis plasma density (less than 10 18  cm −3 ) than in conventional hydrodynamic plasma waveguides generated in unclustered gases. Using femtosecond pump pulses, self-guided propagation and strong absorption (more than 70%) are used to produce long centimetre scale channels in an argon cluster jet, and a subsequent intense pulse is coupled into the guide with 50% efficiency and guided at above 10 17  W cm −2 intensity over 40 Rayleigh lengths. We also demonstrate efficient generation of waveguides using 100 ps axicon-generated Bessel-beam pump pulses. Despite the expected sub-picosecond cluster disassembly time, we observe long pulse absorption efficiencies up to a maximum of 35%. Simulations show that in the far leading edge of the long laser pulse, the volume of heated clusters evolves to a locally uniform and cool plasma already near ionization saturation, which is then efficiently heated by the remainder of the pulse.

GENERATION OF COHERENT, BROADBAND AND TUNABLE SOFT X-RAY CONTINUUM AT THE LEADING EDGE OF THE DRIVER LASER PULSE

2008 ◽  
Author(s):  
AURÉLIE JULLIEN ◽  
THOMAS PFEIFER ◽  
MARK J. ABEL ◽  
PHILLIP M. NAGEL ◽  
STEPHEN R. LEONE ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Leading Edge ◽  
X Ray

High-intensity short KrF laser-pulse generation by saturated amplification of truncated leading-edge pulse

2000 ◽  
Vol 185 (4-6) ◽  
pp. 431-437 ◽  
Author(s):  
E Takahashi ◽  
K Kuwahara ◽  
Y Matsumoto ◽  
I Okuda ◽  
I Matsushima ◽  
...  
Keyword(s):  
Laser Pulse ◽  
High Intensity ◽  
Leading Edge ◽  
Pulse Generation ◽  
Krf Laser

Self-resonant plasma wake-field excitation by a laser pulse with a steep leading edge for particle acceleration

1995 ◽  
Vol 52 (5) ◽  
pp. 5327-5332 ◽  
Author(s):  
V. V. Goloviznin ◽  
P. W. van Amersfoort ◽  
N. E. Andreev ◽  
V. I. Kirsanov
Keyword(s):  
Particle Acceleration ◽  
Laser Pulse ◽  
Leading Edge ◽  
Wake Field ◽  
Field Excitation
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