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Applied Optics

Applied Optics


  • Vol. 24, Iss. 17 — Sep. 1, 1985
  • pp: 2823–2826

Novel small-angle collective Thomson scattering system

Christopher E. Clayton, Chris Darrow, and Chan Joshi  »View Author Affiliations

Applied Optics, Vol. 24, Issue 17, pp. 2823-2826 (1985)

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A Thomson scattering opticals system is described with the following characteristics: (1) it allows scattering angles down to 1 mrad before collection optics interfere with beam dumping; (2) it gives excellent k resolution for angles of ≳1.5 mrad; (3) it collects light from a scattering volume which can be variably positioned without optical realignment; and (4) it is compact in size. The design, test data, and an application to ruby-laser scattering from 100-μm wavelength plasma waves are presented.

© 1985 Optical Society of America

Original Manuscript: April 4, 1985
Published: September 1, 1985

Christopher E. Clayton, Chris Darrow, and Chan Joshi, "Novel small-angle collective Thomson scattering system," Appl. Opt. 24, 2823-2826 (1985)

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  1. J. Sheffield, Plasma Scattering of Electromagnetic Radiation (Academic, New York, 1975).
  2. C. Joshi, W. B. Mori, T. Katsouleas, J. M. Dawson, J. M. Kindel, D. W. Forslund, “Ultrahigh Gradient Particle Acceleration by Intense Laser-Driven Plasma Density Waves,” Nature London 311, 525 (1984). [CrossRef]
  3. For more details on this experiment, see C. E. Clayton, C. Joshi, C. Darrow, D. Umstadter, “Relativistic Plasma Wave Excitation by Collinear Optical Mixing,” Phys. Rev. Lett. 54, 2343 (1985). [CrossRef] [PubMed]
  4. The plasma wave spectrum is actually a surface in kykz space, i.e., S(ky,kz). The frequency shift due to the finite frequency (ωp) of the plasma wave gives a k shift to the scattered light of δk = ωp/c, which is mainly in the y direction, perpendicular to the propagation direction (z direction) of the wave. Thus the spectrum one measures is actually S(ωp/c,kz), which we call the kz spectrum at ky = ωp/c or simply the kz spectrum. For a stationary scatterer, such as a grating, ωp is zero.
  5. The degree of collimation of the scattered beam and, therefore, its spot size depend on the length or number of periods of the coherent scatterer. See Fig. 3(c) and related text.
  6. R. E. Slusher, C. M. Surko, “Study of Density Fluctuations in Plasmas by Small Angle CO2 Laser Scattering,” Phys. Fluids 23, 472 (1980). [CrossRef]

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