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

机译:Pic秒激光脉冲下碳量子点的非线性吸收

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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~(-12) m/W and 6.9×10~(-12) m/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~(-12) m/W and -1.3×10~(-12) m/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.
机译:使用Z-扫描技术研究了波长为532nm的PICOSECOND激光脉冲下碳量子点(CDS)的非线性吸收特性,CDS的类型均为不同溶剂的粒径和不同颗粒尺寸的相同溶剂。实验结果表明,3.9nm水溶性Cds的非线性吸收是饱和吸收,而油溶性Cds'是相同粒度的反向可饱和的吸收,其非线性吸收系数为-2.09×10〜(-12) M / W和6.9×10〜(-12)m / w。水溶性Cds为4.8nm的非线性吸收是反向可饱和的吸收,并且油溶性Cds'是相同粒度的饱和吸收,它们的非线性吸收系数为1.9×10〜(-12)m / w和-1.3×分别为10〜(-12)m / w。实验结果表明,CD的非线性吸收主要受溶剂效应和量子尺寸效应的影响。

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