Аннотация:Studies of multiphoton molecular resonant absorption (MPA) processes in polyatomic molecules induced by intense picosecond infrared laser radiation provide a successful method to investigate the dynamics of nonlinear molecular excitation and laser-controlled photophysical and photochemical reactions. We present the 10 micrometers picosecond pulse laser technique and the results of experimental study of the multiphoton absorption and THG in SF6 and C2H4.