, Volume 25, Issue 1, pp 63–70 | Cite as

Effect of lateral energy transport on ablation pressure scaling in laser irradiated planar foil targets

  • L J Dhareshwar
  • P A Naik
  • S Sharma
  • H C Pant
Plasma Physics


Experimental investigations on ablatively accelerated thin plastic foil targets irradiated by a 6J, 5 nsec Nd: glass laser pulse, were conducted using shadowgraphy technique. A 2 nsec, 0.53 µm probe pulse, derived from the main laser was used for recording the foil motion. It was observed that 6 µm plastic foils could be accelerated to a velocity of about 3 × 106 cm/sec for an incident laser intensity of 5 × 1013 W/cm2 and the corresponding ablation pressure was 0.4 Mbar. Ablation pressure (P) scaling against absorbed laser intensity (I a ) was slower (PI a 0.4 ) for a smaller laser focal spot (30 µm) as compared to the scaling (PI a 0.7 ) for a larger focal spot (500 µm). This result has been explained considering the loss due to lateral energy transport from the laser plasma interaction region.


Plasma laser fusion ablative compression shadowgraphy lateral transport 


52.25 52.50 52.70 


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  1. Bruckner K and Jorna S 1974Rev. Mod. Phys. 46 325CrossRefADSGoogle Scholar
  2. Dawson J M 1970Laser Plasmas and nuclear energy (ed) H Hora (New York: Plenum Press) 1975Google Scholar
  3. Grun J, Decoste R, Ripin B H and Gardner J 1981Appl. Phys. Lett. 39 545CrossRefADSGoogle Scholar
  4. Grun Jet al 1982Phys. Fluids 26 588CrossRefADSGoogle Scholar
  5. Kidder R E 1968Nucl. Fusion 8 3Google Scholar
  6. Lewis C L Set al 1982J. Phys. D15 69ADSGoogle Scholar
  7. Nishimura Het al 1981Appl. Phys. Lett. 39 592CrossRefADSGoogle Scholar
  8. Nuckolls J, Wood L, Thiessen A and Zimmerman G 1972Nature (London)239 139CrossRefADSGoogle Scholar
  9. Obenschain S Pet al 1982 NRL Report 4747Google Scholar
  10. Pant H C, Sharma S and Shirsat T S 1984J. Appl. Phys. 55 697CrossRefADSGoogle Scholar
  11. Raven Aet al 1982Appl. Phys. Lett. 40 776CrossRefADSGoogle Scholar
  12. Ripin B Het al 1980Phys. Fluids 23 1012CrossRefADSGoogle Scholar
  13. RL-81-040, 1981 Rutherford Laboratory Central Laser Facility Annual ReportGoogle Scholar
  14. Sharma S, Pant H C and Moncet M 1983J. Appl. Phys. 54 4666CrossRefADSGoogle Scholar
  15. Stamper J Aet al 1981Laser interaction and related plasma phenomena (ed.) H J Schwarz M J Lubin and B Yaakobi (New York: Plenum Press)5 617Google Scholar
  16. Van Kessel C G M 1975Z. Naturforschung. 30 1582Google Scholar

Copyright information

© Indian Academy of Sciences 1985

Authors and Affiliations

  • L J Dhareshwar
    • 1
  • P A Naik
    • 1
  • S Sharma
    • 1
  • H C Pant
    • 1
  1. 1.Laser Division, Bhabha Atomic Research CentreBombayIndia

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