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Propagation of an ultrashort, high-intensity laser pulse in gas-target plasma

Published online by Cambridge University Press:  28 May 2012

XIAOFANG WANG ,
GUANGHUI WANG ,
ZHANNAN MA ,
KEGONG DONG ,
BIN ZHU ,
YUCHI WU  and
YUQIU GU
XIAOFANG WANG
Affiliation:
Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China (wang1@ustc.edu.cn)
GUANGHUI WANG
Affiliation:
Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China (wang1@ustc.edu.cn)
ZHANNAN MA
Affiliation:
Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China (wang1@ustc.edu.cn)
KEGONG DONG
Affiliation:
Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China (wang1@ustc.edu.cn) Laser Fusion Research Center, China Academy of Engineering Physics, Mianyang 621900, China (yqgu@caep.ac.cn)
BIN ZHU
Affiliation:
Laser Fusion Research Center, China Academy of Engineering Physics, Mianyang 621900, China (yqgu@caep.ac.cn)
YUCHI WU
Affiliation:
Laser Fusion Research Center, China Academy of Engineering Physics, Mianyang 621900, China (yqgu@caep.ac.cn)
YUQIU GU
Affiliation:
Laser Fusion Research Center, China Academy of Engineering Physics, Mianyang 621900, China (yqgu@caep.ac.cn)
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Abstract

For high-energy gain of electron acceleration by a laser wakefield, a stable or guiding propagation of an ultrashort, high-intensity laser pulse in a gas-target plasma is of fundamental importance. Preliminary experiments were carried out for the propagation of 30-fs, ~100-TW laser pulses of intensities ~1019W/cm2 in plasma of densities ~1019/cm3. Self-guiding length of nearly 1.4 mm was observed in a gas jet and 15 mm in a hydrogen-filled capillary. Fluid-dynamics simulations are used to characterize the two types of gas targets. Particle-in-cell simulations indicate that in the plasma, after the pulse's evolution of self-focusing and over-focusing, the high-intensity pulse could be stably guided with a beam radius close to the plasma wavelength. At lower plasma densities, a preformed plasma channel of a parabolic density profile matched to the laser spot size would be efficient for guiding the pulse.

Type
Papers
Information
Journal of Plasma Physics , Volume 78 , Special Issue 4: Progress in Laser Acceleration of Particles , August 2012 , pp. 483 - 489
Copyright
Copyright © Cambridge University Press 2012

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