Ultrfast Optical Nonlinearity Investigation Of Tetra (p-hydroxyethylphenyl) Porphyrin Tripropionate(Por-OH) Polyme

Organic molecular materials have excellent nonlinear optical effects and short response time, making it bright prospect and attracting widespread attention in the field of all-optical communications, optical devices, etc. Therefore, the nonlinear materials occupy a very important position in the researching of nonlinear optics. Exploring new nonlinear material, studying the nonlinear materials properties become more important work. Summing up kinds of non-linear material laws, establishing of the theoretical model to analyze its nature, can help us to explore superior nonlinear materials.Based on picosecond 532 nm z-scan experiment, studied a new porphyrin properties of organic molecular materials 5, 10, 15, 20-tetra(p-hydroxyethylphenyl) porphyrin tripropionate(Por-OH) Polymer /DMF solution. The sample is found that have good reverse saturable absorption properties and negative nonlinear refraction effects.Excited-state nonlinear is the main reason of nonlinear response using picosecond laser pulses to test nonlinear optical properties of the samples. Combined with five-level theoretical models, the nonlinear optical mechanisms are explained theoretically. excited-state nonlinear parameters of 5, 10, 15, 20-tetra(p-hydroxyethylphenyl) porphyrin tripropionate(Por-OH) Polymer /DMF solution is determined by combining nanosecond z-scan experiment. Fitting results indicate that the sample has a strong excited-state nonlinear absorption cross section and long excited-state nonlinear lifetime, indicating that the compounds are very suitable for optical limiting applications.