High-accuracy reference standards for two-photon absorption in the 680-1050 nm wavelength range
High-accuracy reference standards for two-photon absorption in the 680-1050 nm wavelength range
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DOI：
10.1364/oe.24.009053
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发表时间：
2016-04-18
期刊：
影响因子：
3.8
通讯作者：
Rebane, Aleksander
中科院分区：
文献类型：
--
作者：
de Reguardati, Sophie;Pahapill, Juri;Rebane, Aleksander
采用飞秒荧光激发法，在波长λ（2 PA）= 680-1050 nm，脉冲重复频率近似为100 MHz的条件下，测量了一系列有机荧光团的简并双光子吸收（2 PA）。得到了相对2 PA谱形函数，估计精度为5%;在选定波长处测量了绝对2 PA截面，估计精度为8%。通过严格评估荧光信号对整个波长范围内入射光子通量的二次依赖性，通过比较两个独立实验获得的结果，以及由于对关键实验参数的细致评估，包括激发空间和时间脉冲形状，激光功率和样品几何形状，实现了精度的显着提高。讨论了参考标准在非线性透过率测量中的应用。(C)2016美国光学学会
Degenerate two-photon absorption (2PA) of a series of organic fluorophores is measured using femtosecond fluorescence excitation method in the wavelength range, lambda(2PA) = 680-1050 nm, and similar to 100 MHz pulse repetition rate. The function of relative 2PA spectral shape is obtained with estimated accuracy 5%, and the absolute 2PA cross section is measured at selected wavelengths with the accuracy 8%. Significant improvement of the accuracy is achieved by means of rigorous evaluation of the quadratic dependence of the fluorescence signal on the incident photon flux in the whole wavelength range, by comparing results obtained from two independent experiments, as well as due to meticulous evaluation of critical experimental parameters, including the excitation spatial- and temporal pulse shape, laser power and sample geometry. Application of the reference standards in nonlinear transmittance measurements is discussed. (C) 2016 Optical Society of America