Frequency conversion of picosecond radiation in fullerene-doped polyimide films and colloidal metals

• Published in: Journal of optics. B, Quantum and semiclassical optics Quantum and semiclassical optics, 2001-06, Vol.3 (3), p.88-92
• Main Authors: Ganeev, R A, Ryasnyansky, A I, Kamanina, N V, Kulagin, I A, Kodirov, M K, Usmanov, T
• Format: Article
• Language: English
• ISSN: 1464-4266; 1741-3575
• DOI: 10.1088/1464-4266/3/3/303

Investigations of third-harmonic generation (THG) of picosecond Nd:YAG laser radiation in CT0-doped polyimide films and colloidal metals (Pt and Cu) are presented. The nonlinear susceptibility Chi sup (3) (-3omega; omega, omega, omega) of the fullerene-doped film was measured to be (9 +/- 4.5) x 10 exp -13 esu (for 0.5 percent C70 in polyimide 6B film). The influence of nonlinear refraction of fullerene-doped films on the phase-matching conditions of THG was responsible for deviation from the cubic power dependence of the third-harmonic signal on the fundamental radiation intensity, I(sub 3 omega)(I(sub omega)), and restriction of THG efficiency in 0.5 percent C70-doped polyimide film. THG efficiencies were found to be 6 x 10 exp -6 and 7 x 10 exp -7 for 0.5 percent C70-doped polyimide film and colloidal platinum respectively. The maximal predicted efficiency of THG in 0.5 percent C70-doped polyimide film at weak focusing has been achieved. Nonlinear susceptibilities Chi sup (3) (-3omega; omega, omega, omega) of colloidal platinum and copper were measured to be (1.5 +/- 0.75) x 10 exp -14 and (1 +/- 0.5) x 10 exp -14 esu respectively. (Author)