28 March 2018 Z-scan study of nonlinear optical standards and D-A fluorophores considering fifth-order optical nonlinearities
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Abstract
The third- and fifth-order nonlinear optical components are extracted using z-scan under a series of irradiances for some common reference materials rhodamine B(RhB) and carbon disulfide (CS2) as well as D-A fluorophores triphenylamine-phenylaldehyde (TPA-PA) and 2diphenylamine-tetraphenylethylene-phenylaldehyde (2DPA-TPE-PA). By differentiating the third- order optical nonlinearities from high-order ones, the two-photon absorption (2PA) cross sections of RhB, TPA-PA, and 2DPA-TPE-PA estimated from z-scan are almost all consistent with those estimated from two-photon excited fluorescence, whereas the second-order refractive indices of CS2 and TPA-PA in THF solution agree with reported values in publications as well. If the z-scan curve is captured at only a single irradiance, the 2PA cross sections will probably be overestimated. As for the fifth-order optical nonlinearities, the excited-state absorption cross sections of RhB are reduced with an increase in its concentration in methanol solutions. A more comprehensive photophysical picture of the nonlinear absorption and refraction processes within these samples can be drawn from their z-scan results.
© 2018 Society of Photo-Optical Instrumentation Engineers (SPIE)
Yilin Zhang, Yilin Zhang, Meijuan Jiang, Meijuan Jiang, Jie Li, Jie Li, Bin Hu, Bin Hu, Ben Zhong Tang, Ben Zhong Tang, Kam Sing Wong, Kam Sing Wong, } "Z-scan study of nonlinear optical standards and D-A fluorophores considering fifth-order optical nonlinearities," Journal of Photonics for Energy 8(3), 032202 (28 March 2018). https://doi.org/10.1117/1.JPE.8.032202 . Submission: Received: 27 December 2017; Accepted: 9 March 2018
Received: 27 December 2017; Accepted: 9 March 2018; Published: 28 March 2018
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