Optical nonlinearities of (TBA) 2 Ni(dmit)2: saturable-absorption and negative third-order nonlinear refraction due to charge-transfer transition
作者： Chuan-Lang Zhan , Wei Xu , Deqing Zhang , Dehuan Li , Zhen-Zhong Lu
DOI: 10.1117/12.444981
关键词:
摘要: The optical nonlinearity of (TBA)2Ni(dmit)2 (TBA = tert-n-butanyl-amonimium, dmit 1,3-dithiol-2-thione-4,5-dithiolate) at high incident irradiance was investigated using Z-scan technique with 1064 nm picosecond laser pulses. This molecule shows a strong absorption band ranging from 900 to 1600 nm. Under excitation by 1064nm pulses, this exhibits typical saturable-absorption (SA) due transition, and negative third-order contribution nonlinear refraction (NLR). result indicates that it self-defocusing. In addition, positive fifth-order NLR, the influences aggregation excited-state on were also observed in molecule.
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