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

M. H. Xu, Y. T. Li, D. C. Carroll, P. S. Foster, S. Hawkes, S. Kar, F. Liu, K. Markey, P. McKenna, M. J. V. Streeter, C. Spindloe, Z. M. Sheng, C. -G. Wahlstrom, M. Zepf, J. Zheng, J. Zhang, D. Neely

Research output: Contribution to journalArticle

12 Citations (Scopus)

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. 

LanguageEnglish
Article number084101
Pages-
Number of pages4
JournalApplied Physics Letters
Volume100
Issue number8
DOIs
Publication statusPublished - 20 Feb 2012

Fingerprint

defocusing
foils
augmentation
thermal blooming
lasers
ions
protons
interactions
proton energy
spontaneous emission
cut-off
electron energy
energy

Keywords

  • ion generation
  • femtosecond ultraintense
  • laser-foil interactions
  • defocusing

Cite this

Xu, M. H. ; Li, Y. T. ; Carroll, D. C. ; Foster, P. S. ; Hawkes, S. ; Kar, S. ; Liu, F. ; Markey, K. ; McKenna, P. ; Streeter, M. J. V. ; Spindloe, C. ; Sheng, Z. M. ; Wahlstrom, C. -G. ; Zepf, M. ; Zheng, J. ; Zhang, J. ; Neely, D. / Enhancement of ion generation in femtosecond ultraintense laser-foil interactions by defocusing. In: Applied Physics Letters. 2012 ; Vol. 100, No. 8. pp. -.
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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. ",
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author = "Xu, {M. H.} and Li, {Y. T.} and Carroll, {D. C.} and Foster, {P. S.} and S. Hawkes and S. Kar and F. Liu and K. Markey and P. McKenna and Streeter, {M. J. V.} and C. Spindloe and Sheng, {Z. M.} and Wahlstrom, {C. -G.} and M. Zepf and J. Zheng and J. Zhang and D. Neely",
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Xu, MH, Li, YT, Carroll, DC, Foster, PS, Hawkes, S, Kar, S, Liu, F, Markey, K, McKenna, P, Streeter, MJV, Spindloe, C, Sheng, ZM, Wahlstrom, C-G, Zepf, M, Zheng, J, Zhang, J & Neely, D 2012, 'Enhancement of ion generation in femtosecond ultraintense laser-foil interactions by defocusing' Applied Physics Letters, vol. 100, no. 8, 084101, pp. -. https://doi.org/10.1063/1.3688027

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.; Streeter, M. J. V.; Spindloe, C.; Sheng, Z. M.; Wahlstrom, C. -G.; Zepf, M.; Zheng, J.; Zhang, J.; Neely, D.

In: Applied Physics Letters, Vol. 100, No. 8, 084101, 20.02.2012, p. -.

Research output: Contribution to journalArticle

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AU - Li, Y. T.

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