Temporally and spectrally resolved omega ₀/2 harmonic emission and stimulated Raman scattering has been observed from thin foils irradiated by double pulse of 0.53 mu m laser light. Asymmetric omega ₀/2 spectrum from the prepulse can be explained by the spectral model including 2 omega _p-plasmon-photon coupling and the effects of plasmon refraction. The Raman signal from the main pulse is broad corresponding to densities up to 0.22 n_c for the Raman process. An anomalous red shift approximately 1000 AA from the omega ₀/2 frequency observed during the main pulse indicates inverse resonance absorption of the Raman-plasmons, because the red shift is too large to be explained by the 2 omega _p-instability.