Spectroscopic study of scattered light at around the fundamental wavelength in UV laser-produced plasmas

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Abstract
Spectroscopic studies of scattered light from UV laser plasmas near the fundamental wavelength are reported. Three distinct spectral components are observed in these experiments. Doppler‐broadened spectra are observed in transmitted light from thin targets and in specularly reflected light from tilted targets. At intensities above 1014 W/cm2, stimulated Brillouin scattered spectra are measured in backscatter for both normal and oblique incidence of the laser. An additional new component is observed in backscattering from targets at normal incidence. This component is broad and blue‐shifted, and is consistent with analytical model calculation based on filamentation.