Generation of the third harmonic in fullerene-containing polyimide films by picosecond radiation of the Nd: YAG laser

The results of the studies on the transformation of the frequency of laser radiation in polyimide films doped by C 70 are presented. The nonlinear susceptibility (χ (3) ) of polyimide 6B films with various concentrations of C 70 is studied by third-harmonic generation. At a wavelength of 1064 nm, the value of χ (3) (−3ω; ω, ω, ω) is 9×10 −13 esu. The effect of the nonlinear variation in the refractive index of the fullerene-containing films on the phase matching between the pumping and third-harmonic waves is analyzed. The third harmonic of the Nd: YAG laser radiation was generated with the efficiencies 6×10 −6 and 10 −6 in the films with the C 70 concentration of 0.5 and 0.2%, respectively.

Hali tarjima qilinmagan