Abstract
Photo-induced enhancement processes of the third-order optical nonlinearity were observed in azobenzene solution under a 30ps pulse pumping at 532 nm. Weinvestigated the time evolution of the enhancement and found that it was mainly due to the population of the first excited state. By theoretical simulation of the enhancement processes, the values of the hyperpolarizabilities of the sample-molecules at ground state and at excited state, γg and γs1, were determined to be 1.11 × 10-33 esu and 7.40 × 10-33 esu, respectively.
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