Laser hot spots and the breakdown of linear instability theory with application to stimulated Brillouin scattering

Journal Article · Mon May 02 04:00:00 EDT 1994 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.72.2883· OSTI ID:7270320

Rose, H A; DuBois, D F ^[1]

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1. Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)

Convective instabilities in the strongly damped regime are shown to exhibit essential nonlinear behavior due to laser hot spots when the average laser intensity [l angle][ital I][r angle] approaches a critical threshold value [ital I][sub [ital c]]. The onset of this nonlinear regime is formally signaled by the divergence of the average convective amplification [l angle][ital A][r angle]as [l angle][ital I][r angle][r arrow][ital I][sub [ital c]]. An independent hot spot model of random phase plate optics predicts that [l angle][ital A][r angle][similar to]1/([ital I][sub [ital c]][minus][l angle][ital I][r angle])[sup 2]. A saturated hot spot model of nonlinear stimulated Brillouin scattering (SBS) predicts a rapid turn on and saturation of SBS reflectivity with laser intensity and optic [ital f] number.

• OSTI ID: 7270320
• Journal Information: Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 72:18; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700350* -- Plasma Production
Heating
Current Drive
& Interactions-- (1992-)
AMPLIFICATION
BRILLOUIN EFFECT
COHERENT SCATTERING
CONVECTIVE INSTABILITIES
DAMPING
DATA
ENERGY
GAIN
HOT SPOTS
INFORMATION
INSTABILITY
LASER-PRODUCED PLASMA
LASERS
NONLINEAR PROBLEMS
NUMERICAL DATA
OPTICS
PLASMA
PLASMA INSTABILITY
SATURATION
SCATTERING
THEORETICAL DATA
THRESHOLD ENERGY