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Enhancement of ion generation in femtosecond ultraintense laser-foil interactions by defocusing

Xu, M. H.; Li, Y. T.; Carroll, D. C.; Foster, P. S.; Hawkes, S.; Kar, S.; Liu, F.; Markey, K.; McKenna, P. and Streeter, M. J. V., et al. (2012) In Applied Physics Letters 100(8).
Abstract
A simple method to enhance ion generation with femtosecond ultraintense lasers is demonstrated experimentally by defocusing laser beams on target surface. When the laser is optimally defocused, we find that the population of medium and low energy protons from ultra-thin foils is increased significantly while the proton cutoff energy is almost unchanged. In this way, the total proton yield can be enhanced by more than 1 order, even though the peak laser intensity drops. The depression of the amplified spontaneous emission (ASE) effect and the population increase of moderate-energy electrons are believed to be the main reasons for the effective enhancement. (C) 2012 American Institute of Physics. [doi:10.1063/1.3688027]
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Applied Physics Letters
volume
100
issue
8
publisher
American Institute of Physics
external identifiers
  • wos:000300711200071
  • scopus:84863243913
ISSN
0003-6951
DOI
10.1063/1.3688027
language
English
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yes
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e5251071-2cb2-4ed3-b910-6ecc52d1bafc (old id 2384322)
date added to LUP
2012-03-30 14:37:49
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2017-07-09 03:21:41
@article{e5251071-2cb2-4ed3-b910-6ecc52d1bafc,
  abstract     = {A simple method to enhance ion generation with femtosecond ultraintense lasers is demonstrated experimentally by defocusing laser beams on target surface. When the laser is optimally defocused, we find that the population of medium and low energy protons from ultra-thin foils is increased significantly while the proton cutoff energy is almost unchanged. In this way, the total proton yield can be enhanced by more than 1 order, even though the peak laser intensity drops. The depression of the amplified spontaneous emission (ASE) effect and the population increase of moderate-energy electrons are believed to be the main reasons for the effective enhancement. (C) 2012 American Institute of Physics. [doi:10.1063/1.3688027]},
  articleno    = {084101},
  author       = {Xu, M. H. and Li, Y. T. and Carroll, D. C. and Foster, P. S. and Hawkes, S. and Kar, S. and Liu, F. and Markey, K. and McKenna, P. and Streeter, M. J. V. and Spindloe, C. and Sheng, Z. M. and Wahlström, Claes-Göran and Zepf, M. and Zheng, J. and Zhang, J. and Neely, D.},
  issn         = {0003-6951},
  language     = {eng},
  number       = {8},
  publisher    = {American Institute of Physics},
  series       = {Applied Physics Letters},
  title        = {Enhancement of ion generation in femtosecond ultraintense laser-foil interactions by defocusing},
  url          = {http://dx.doi.org/10.1063/1.3688027},
  volume       = {100},
  year         = {2012},
}