Abstract

Light scattering in large noble gas clusters irradiated by intense laser pulses was studied and compared to absorption measurements. The scattering signal shows the presence of a peak, when the pulse width was varied, similar to one previously reported in absorption measurements. The peak of the scattering, however, occurs at a longer pulse width than for absorption. This result disagrees with a simple simulation and may be due to propagation or non-linear effects not included in the model.

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References

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  1. T. Ditmire, E. Springate, J. Tisch, Y. Shao, M. Mason, N. Hay, J. Marangos and M. Hutchinson, "Explosion of atomic clusters heated by high-intensity femtosecond laser pulses," Phys. Rev. A 57, 369-382 (1998).
    [CrossRef]
  2. C. Rose-Petruck, K. Schafer, K. Wilson and C. Barty, "Ultrafast electron dynamics and inner-shell ionization in laser driven clusters," Phys. Rev. A 55, 1182-1190 (1997).
    [CrossRef]
  3. A. McPherson, B. Thompson, A. Borlsov, K. Boyer and C. Rhodes, "Multiphoton-induced X-ray emission at 4-5 keV from Xe atoms with multiple core vacancies," Nature (London) 370, 631-634 (1994).
    [CrossRef]
  4. T. Ditmire, R. Smith, J. Tisch and M. Hutchinson, "High Intensity Laser Absorption by Gases of Atomic Clusters," Phys. Rev. Lett. 78, 3121-3124 (1997).
    [CrossRef]
  5. Y. Shao, T. Ditmire, J. Tisch, E. Springate, J. Marangos and M. Hutchinson, "Multi-keV Electron Generation in the Interaction of Intense laser Pulses with Xe Clusters," Phys. Rev. Lett. 77, 3343-3346 (1996).
    [CrossRef] [PubMed]
  6. T. Ditmire, J. Tisch, E. Springate, M. Mason, N. Hay, R. Smith, J. Marangos and M. Hutchinson, "High-energy ions produced in explosions of superheated atomic clusters," Nature (London) 386, 54-56 (1997).
    [CrossRef]
  7. J. Zweiback, T. Ditmire and M. Perry, "Femtosecond time-resolved studies of the dynamics of noble-gas cluster explosions," Phys. Rev. A 59, R3166-R3169 (1999).
    [CrossRef]
  8. L. Koller, M. Schumacher, J. Kohn, S. Teuber, J. Tiggesbaumker and K. Meiwes-Broer, "Plasmon-Enhanced Multi-Ionization of Small Metal Clusters in Strong Femtosecond Laser Fields," Phys. Rev. Lett. 82, 3783-3786 (1999).
    [CrossRef]
  9. T. Ditmire, T. Donnelly, A. Rubenchik, R. Falcone and M. Perry, "Interaction of intense laser pulses with atomic clusters," Phys. Rev. A 53, 3379-3402 (1996).
    [CrossRef] [PubMed]
  10. M. Kerker, The Scattering of Light and other electromagnetic radiation (Academic Press, 1969).
  11. V. Silin, "Nonlinear High-Frequency Plasma Conductivity," Sov. Phys. JETP 20, 1510-1516 (1965).
  12. W. Wiscombe, "Improved Mie scattering algorithms," Appl. Opt. 19, 1505-1509 (1980).
    [CrossRef] [PubMed]

Other

T. Ditmire, E. Springate, J. Tisch, Y. Shao, M. Mason, N. Hay, J. Marangos and M. Hutchinson, "Explosion of atomic clusters heated by high-intensity femtosecond laser pulses," Phys. Rev. A 57, 369-382 (1998).
[CrossRef]

C. Rose-Petruck, K. Schafer, K. Wilson and C. Barty, "Ultrafast electron dynamics and inner-shell ionization in laser driven clusters," Phys. Rev. A 55, 1182-1190 (1997).
[CrossRef]

A. McPherson, B. Thompson, A. Borlsov, K. Boyer and C. Rhodes, "Multiphoton-induced X-ray emission at 4-5 keV from Xe atoms with multiple core vacancies," Nature (London) 370, 631-634 (1994).
[CrossRef]

T. Ditmire, R. Smith, J. Tisch and M. Hutchinson, "High Intensity Laser Absorption by Gases of Atomic Clusters," Phys. Rev. Lett. 78, 3121-3124 (1997).
[CrossRef]

Y. Shao, T. Ditmire, J. Tisch, E. Springate, J. Marangos and M. Hutchinson, "Multi-keV Electron Generation in the Interaction of Intense laser Pulses with Xe Clusters," Phys. Rev. Lett. 77, 3343-3346 (1996).
[CrossRef] [PubMed]

T. Ditmire, J. Tisch, E. Springate, M. Mason, N. Hay, R. Smith, J. Marangos and M. Hutchinson, "High-energy ions produced in explosions of superheated atomic clusters," Nature (London) 386, 54-56 (1997).
[CrossRef]

J. Zweiback, T. Ditmire and M. Perry, "Femtosecond time-resolved studies of the dynamics of noble-gas cluster explosions," Phys. Rev. A 59, R3166-R3169 (1999).
[CrossRef]

L. Koller, M. Schumacher, J. Kohn, S. Teuber, J. Tiggesbaumker and K. Meiwes-Broer, "Plasmon-Enhanced Multi-Ionization of Small Metal Clusters in Strong Femtosecond Laser Fields," Phys. Rev. Lett. 82, 3783-3786 (1999).
[CrossRef]

T. Ditmire, T. Donnelly, A. Rubenchik, R. Falcone and M. Perry, "Interaction of intense laser pulses with atomic clusters," Phys. Rev. A 53, 3379-3402 (1996).
[CrossRef] [PubMed]

M. Kerker, The Scattering of Light and other electromagnetic radiation (Academic Press, 1969).

V. Silin, "Nonlinear High-Frequency Plasma Conductivity," Sov. Phys. JETP 20, 1510-1516 (1965).

W. Wiscombe, "Improved Mie scattering algorithms," Appl. Opt. 19, 1505-1509 (1980).
[CrossRef] [PubMed]

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Figures (6)

Fig. 1.
Fig. 1.

Emission pattern for scattered laser light. The target was argon at 600 psi. This fit is a cos2(θ). The intensity was 1.3×1016 W/cm2. The pulse width was 800 fs.

Fig. 2.
Fig. 2.

Scattering (bottom) and absorption (top) in xenon as a function of pulse width. The input energy was 6.4 mJ which corresponds to an intensity of 2.4×1017 W/cm2 for a 50 fs pulse. Data for 50 psi (triangles), 100 psi (circles), and 200 psi (squares) backing pressures are shown. The lines represent model calculations for 50 psi (dotted), 100 psi (dashed), and 200 psi (solid)

Fig. 3.
Fig. 3.

Calculated scattering (dashed) and absorption (solid) cross sections from Mie theory. The index of refraction was constant for all radii.

Fig. 4.
Fig. 4.

Calculated dielectric constant for an expanding plasma sphere. Plot shows both real (dashed) and imaginary (solid) components.

Fig. 5.
Fig. 5.

Calculated cross-sections for an expanding plasma sphere. Plot shows both absorption (solid) and scattering (dashed) cross-sections. Calculation was done for a 300 eV plasma

Fig. 6.
Fig. 6.

Calculated scattering (dashed) and heating (solid) for a 100 Å xenon cluster. The pulse width was 450 fs and the intensity was 4.1×1015.

Equations (2)

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σ sca = 8 π 3 k 4 r 6 1 + 2 2 , σ abs = 4 π k r 3 Im { 1 + 2 } .
= 1 n 0 n crit ( r 0 r ) 3 ( 1 + i ν ω ) 1

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