Effect of diffraction on stimulated Brillouin scattering from a single laser hot spot

Journal Article · Tue Oct 01 04:00:00 EDT 1996 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.871509· OSTI ID:383792

Eliseev, V V; Rozmus, W; Tikhonchuk, V T ^[1]; Capjack, C E ^[2]

---

1. Theoretical Physics Institute, Department of Physics, University of Alberta, Edmonton, Alberta, T6G 2J1 (CANADA)
2. Department of Electrical Engineering, University of Alberta, Edmonton, Alberta, T6G 2G7 (CANADA)

A single laser hot spot in an underdense plasma is represented as a focused Gaussian laser beam. Stimulated Brillouin scattering (SBS) from such a Gaussian beam with small {ital f}/numbers 2-4 has been studied in a three-dimensional slab geometry. It is shown that the SBS reflectivity from a single laser hot spot is much lower than that predicted by a simple three wave coupling model because of the diffraction of the scattered light from the spatially localized ion acoustic wave. SBS gain per one Rayleigh length of the incident laser beam is proposed as a quantitative measure of this effect. Diffraction-limited SBS from a randomized laser beam is also discussed. {copyright} {ital 1996 American Institute of Physics.}

• OSTI ID: 383792
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 10 Vol. 3; ISSN 1070-664X; ISSN PHPAEN
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BEAM-PLASMA SYSTEMS
BRILLOUIN EFFECT
HOT SPOTS
ION ACOUSTIC WAVES
LASER RADIATION
LASER-PRODUCED PLASMA
LIGHT SCATTERING
PARAMETRIC INSTABILITIES