The third-order nonlinear optical properties of unsymmetrical trimethine cyanine dyes

摘要

In this paper, we investigate the nonlinear optical properties of unsymmetrical trimethine cyanine dyes(ethy1-4-(3-(3-ethylbenzo[d]xazole-2(3H)-ylidene)prop-1-en-1-yl)quinolin-1-iumiodidebenzo[d]xa zole group) by conducting Z-scan technique at 532 nm and time-resolved pump probe with phase object (POPP). Pronounced reverse saturable absorption (RSA) and positive refraction are observed. Moreover, the relevant third-order NLO photo-physical parameters of unsymmetrical trimethine cyanine dyes determined unambiguously.