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提出了有机染料反式 4 [4′ (N 羟乙基 N 乙基胺基 )苯乙烯基 ] N 甲基吡啶对甲苯磺酸盐 (简称HEASPS)非线性吸收的三态模型。认为在较短波长 (<1 0 0 0nm)时 ,双光子吸收和激发态吸收同时存在。成功地解释了该染料双光子吸收峰相对线性吸收峰的两倍的明显蓝移 ,以及最高上转换效率波长相对最强吸收波长的明显红移。提出了一种新的计算方法 ,利用不同波长的非线性透过率和不同波长的上转换效率 ,求出了该染料的双光子吸收截面和激发态吸收系数。
A three-state model for the nonlinear absorption of trans-4 [4 ’(N-hydroxyethyl-N-ethylamino) styryl] N-methylpyridine p-toluenesulfonate (HEASPS) It is believed that two-photon absorption and excited-state absorption exist simultaneously at shorter wavelengths (<1000 nm). The clear blue shift of twice the linear absorption peak of the two-photon absorption peak of the dye and the significant red-shift of the highest up-conversion efficiency wavelength from the most-intense absorption wavelength were successfully explained. A new calculation method is proposed to calculate the two-photon absorption cross-section and the excited state absorption coefficient of the dye by using the nonlinear transmittance of different wavelengths and the upconversion efficiency of different wavelengths.