Browsing by Author "Tsai, PC"

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Studies of nonlinear absorption and refraction in C-60/toluene solution
(2000-02-18)
Wei, TH
;
Huang, TH
;
Wu, TT
;
Tsai, PC
;
Lin, MS
Nonlinear absorptive and refractive properties of C-60/toluene solution are studied using the Z-scan technique and a 532 nm laser delivering single picosecond (ps) pulses and trains of ps pulses separated by 7 nanoseconds (ns). With single ps pulses, reverse saturable absorption and positive nonlinear refraction are observed and attributed to population transitions among the singlet states. With ps pulse trains, a sign change of nonlinear refraction relative to that of single ps-pulse excitation is observed and is attributed to heat-induced temperature rise and population relaxing to triplet states. (C) 2000 Elsevier Science B.V. All rights reserved.