Stimulated brillouin backscatter of a short-pulse laser

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Stimulated Brillouin backscattering (SBBS) from a short-pulse laser, where the pulse length is short compared to the plasma length, is found to be qualitatively different than in the long pulse regime, where the pulse length is long compared to the plasma length. We find that after an initial transient of order the laser pulse length transit time, the instability reaches a steady state in the variables x{prime} = x {minus} V{sub g}t, t{prime} = t, where V{sub g} is the pulse group velocity. In contrast, SBBS in a long pulse can be absolutely unstable and grows indefinitely, or until nonlinearities ... continued below

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42 p.

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Hinkel, D.E.; Williams, E.A. & Berger, R.L. November 3, 1994.

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Description

Stimulated Brillouin backscattering (SBBS) from a short-pulse laser, where the pulse length is short compared to the plasma length, is found to be qualitatively different than in the long pulse regime, where the pulse length is long compared to the plasma length. We find that after an initial transient of order the laser pulse length transit time, the instability reaches a steady state in the variables x{prime} = x {minus} V{sub g}t, t{prime} = t, where V{sub g} is the pulse group velocity. In contrast, SBBS in a long pulse can be absolutely unstable and grows indefinitely, or until nonlinearities intervene. We find that the motion of the laser pulse induces Doppler related effects that substantially modify the backscattered spectrum at higher intensities, where the instability is strongly coupled (i.e. , has a growth rate large compared to the ion acoustic frequency).

Physical Description

42 p.

Notes

INIS; OSTI as DE96005401

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  • Meeting of the Division of Plasma Physics of the American Physical Society, Minneapolis, MN (United States), 7-11 Nov 1994

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  • Other: DE96005401
  • Report No.: UCRL-JC--117056
  • Report No.: CONF-941101--15
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 207420
  • Archival Resource Key: ark:/67531/metadc665377

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  • November 3, 1994

Added to The UNT Digital Library

  • June 29, 2015, 9:42 p.m.

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  • Feb. 17, 2016, 5:59 p.m.

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Hinkel, D.E.; Williams, E.A. & Berger, R.L. Stimulated brillouin backscatter of a short-pulse laser, article, November 3, 1994; California. (digital.library.unt.edu/ark:/67531/metadc665377/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.