19 October 2001 Optical nonlinearities of (TBA)2Ni(dmit)2: saturable-absorption and negative third-order nonlinear refraction due to charge-transfer transition
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Proceedings Volume 4580, Optoelectronics, Materials, and Devices for Communications; (2001) https://doi.org/10.1117/12.444981
Event: Asia-Pacific Optical and Wireless Communications Conference and Exhibit, 2001, Beijing, China
Abstract
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 laser pulses, this molecule exhibits typical saturable-absorption (SA) due to this transition, and shows a negative third-order contribution to nonlinear refraction (NLR). This result indicates that it shows a third-order self-defocusing. In addition, a positive fifth-order contribution to NLR, and the influences of aggregation and high excited-state absorption on nonlinear absorption were also observed in this molecule.
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Chuan-Lang Zhan, Wei Xu, Deqing Zhang, Dehuan Li, Zhen-Zhong Lu, Yu-Xin Nie, Daoben Zhu, "Optical nonlinearities of (TBA)2Ni(dmit)2: saturable-absorption and negative third-order nonlinear refraction due to charge-transfer transition", Proc. SPIE 4580, Optoelectronics, Materials, and Devices for Communications, (19 October 2001); doi: 10.1117/12.444981; https://doi.org/10.1117/12.444981
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