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AbstracL Spectral data on fwo emission from a long-scale-length carbon plasma produced by 1.064 w n laser light are presented at an average laser intensity of 3.0 x lOI3 W cm-l. Both wings of the specmm in the backscattering direction, which were observed in the laser-plasma experimentmeported earlier only at laser intensities greater than 2 x loi4 W c d , have been observed in the present experiment. The possible mechanisms producing the backscattered ; m blue photons have been analysed. It is concluded that the specular reflection of the amplified blue plasmons excited by the convecting two-plasmon decay instability is densityscale-length dependent and is the effective mechanism for the observation of the blue wing in the specmm.

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