Results of odd harmonics generation (up to eleventh, lambda = 96 nm) o
f laser radiation (lambda = 1.054 nm, tau = 3 ps) in a low-temperature
atmospheric plasma and a surface plasma in vacuum are reported. Maxim
um efficiency was achieved for third harmonics generation (eta = 10(-3
)). High-order harmonics generation and frequency conversion optimizat
ion depending on radiation and nonlinear media characteristics are con
sidered.