The third order hyperpolarizability y 1 ( |j 1 (-to 3 ;co 1 ,co 1 ,co 1 ) of the rare gases He, Ne, Ar, Kr, Xe and of N 2 are determined by third harmonic generation involving picosecond light pulses of a Nd-glass laser. The results are compared with reported experimental and theoretical values.

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The amplification of light signals (angular frequency UJS) in some isotropic media (D20, fused silica, and Schott type SF10 glasses) by noncollinear phase-matched parametric four-photon interaction u<\ + u 2 -> u$ + u\ is studied theoretically. Computer simulations are carried out for fundamental and second-harmonic pump pulses of a mode-locked Nd: glass laser. Degenerate interaction (wavelength A1=A2 = 1054nm or 527 nm) and nondegenerate interaction (A1= 1054nm/ A2 = 527nm) are considered. Characteristic phase-matching parameters and gain parameters versus wavelength are determined. Limitations by spectral bandwidth, optical absorption, optical damage, self-phase modulation, self-focusing and stimulated Raman scattering are analysed.