Nonlinear transmission properties of chloroindium phthalocyanines for picosecond pulse trains

作者：Miao, Quan^*; Sang, Zhaoyang; Liang, Min; Song, Rengang; Sun, Erping; Xu, Yan

来源：Journal of Photochemistry and Photobiology A: Chemistry , 2019, 368: 263-267.

DOI：10.1016/j.jphotochem.2018.10.001

• Optical limiting
• Pulse train
• Phthalocyanine
• Rate equation
• Reverse saturable absorption

We studied the optical dynamics and propagating properties of two chloroindium phthalocyanines with alpha- and beta-alkoxyl substituents interacting with picosecond pulse trains. The pulse train contains 35 picosecond subpulses with 12 ns spacing, and the width of each subpulse is 100 ps. We applied a five-level model to simulate the interaction by solving two-dimensional paraxial field equation coupled with rate equations. Photophysical parameters of molecules are extracted from the experiment and we employed Crank-Nicholson numerical method to get accurate and credible results. The sequential (singlet-singlet) x (triplet-triplet) two-photon absorption is the vital optical limiting channel for long pulse trains. Our work indicates that chloroindium phthalocyanine with beta-alkoxyl substituent shows better optical limiting behaviors for picosecond pulse trains, which is opposite with the result for one single nanosecond laser.

• 出版日期2019-1-1
• 单位中国石油大学（华东）; 山东科技大学