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Two-photon absorption based optical limiting and stabilization by using a CdTe quantum dot solution excited at optical communication wavelength of ∼1300 nm

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6 Author(s)
He, G.S. ; Institute for Lasers, Photonics and Biophotonics, State University of New York at Buffalo, Buffalo, New York 14260-3000 ; Qingdong Zheng ; Yong, K.-T. ; Ryasnyanskiy, Aleksandr I.
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This letter presents the results of two-photon study of CdTe quantum dots (QDs) in chloroform. The measured two-photon absorption (2PA) spectrum shows that 2PA coefficient at ∼1300 nm is ∼0.02 cm/GW. Based on a 1 cm path-length CdTe QD solution sample of 8 mg/ml concentration, irradiated by a focused ∼1300 nm laser beam of ∼160 fs duration, the nonlinear transmission could be changed from ∼100% to ∼20% when the input pulse energy was varied from ∼50 nJ to ∼10 μJ, demonstrating a superior optical limiting performance. The input laser fluctuation was significantly reduced after passing through the sample, indicating a remarkable optical stabilization behavior.

Published in:

Applied Physics Letters  (Volume:90 ,  Issue: 18 )

Date of Publication:

Apr 2007

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