Linear and nonlinear behavior of SBS and SRS in high Z plasmas
Abstract
Experiments have been conducted to study the linear and nonlinear behavior of the stimulated Brillouin and Raman scattering (SBS and SRS, respectively) instabilities in high Z (gold) targets for laser intensities up to 5× 10^16 W/cm^2. The plasma is preformed by a 1 ns, 0.53 μm pulse that irradiates an exploding foil target. The background temperature and density are characterized using Thomson scattering and interferometry. After the target has gone underdense, a 100-ps, 1.064 μm wavelength pulse with an energy of up to 30 J interacts with the target plasma and generates SBS and SRS. Thomson scattering measures the electrostatic noise level without the interaction pulse and the SBS ion wave level with the pulse. The present experiments extend our earlier detailed work on linear SBS behavior.(P. E. Young, Phys. Rev. Lett. 73), 1939 (1994).^,(C. Labaune et al., Phys. Rev. Lett. 76), 3727 (1996). The SRS backscatter light is spectroscopically resolved using a spectrometer and an InGaAs linear detector array.
- Publication:
-
APS Division of Plasma Physics Meeting Abstracts
- Pub Date:
- November 1997
- Bibcode:
- 1997APS..DPPkWP307Y