The nonlinear absorption of carbon quantum dots under the picosecond laser pulse

Qing Chang; Meiling Gao

doi:10.1117/12.2220174

5 November 2015 The nonlinear absorption of carbon quantum dots under the picosecond laser pulse

Qing Chang, Meiling Gao

Proceedings Volume 9795, Selected Papers of the Photoelectronic Technology Committee Conferences held June–July 2015; 97952R (2015) https://doi.org/10.1117/12.2220174
Event: Selected Proceedings of the Photoelectronic Technology Committee Conferences held June-July 2015, 2015, Hefei, Suzhou, and Harbin, China

Abstract

Using Z-scan technique to investigate the nonlinear absorption characteristics of carbon quantum dots (CDs) under the picosecond laser pulse with the wavelength of 532 nm, which the CDs’ types were same particle size of different solvent and same solvent of different particle sizes. The experimental results showed that the nonlinear absorption of water-soluble CDs of 3.9 nm was saturated absorption, and oil-soluble CDs’ was reverse saturable absorption for the same particle size, their nonlinear absorption coefficients were -2.09×10^-12m/W and 6.9×10^-12m/W, respectively; the nonlinear absorption of water-soluble CDs of 4.8 nm was reverse saturable absorption, and oil-soluble CDs’ was saturated absorption for same particle size, their nonlinear absorption coefficients were 1.9×10^-12m/W and -1.3×10^-12m/W, respectively. The experimental results indicate that the nonlinear absorptions of CDs are mainly influenced by the solvent effect and quantum size effect in the same.

Citation Download Citation

Qing Chang and Meiling Gao "The nonlinear absorption of carbon quantum dots under the picosecond laser pulse", Proc. SPIE 9795, Selected Papers of the Photoelectronic Technology Committee Conferences held June–July 2015, 97952R (5 November 2015); https://doi.org/10.1117/12.2220174

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