We report, to our best knowledge, the first observation of two-photon and three-photon fluorescence of Triton X-100 (TX-100) in water and cyclohexane. The observed multiphoton fluorescence (MF) falls in the ultraviolet region 280-340nm as its one photon fluorescence does. Effects of excitation wavelengths and solution concentrations on the fluorescence spectra are investigated. We found the optimal excitation wavelength and solution concentration to obtain the strongest MF. For relatively weaker three-photon fluorescence, there exists fluctuation in its spectrum due to its small SNR. The peak wavelength is around 300nm and only varies slightly with the solution concentration, solvent type, and excitation wavelength, which is quite different from those of other luminophors. This work has extended the wave band of MF to the purple and ultraviolet regions of 280-340nm and study of TX-100 to nonlinear optics field. The results may be potentially applied in ultraviolet MF detection and in manufacturing ultraviolet multiphoton laser in the future. Although for the latter case, there is still a long way to go to enhance its fluorescence efficiency and cross section of stimulated emission beforehand.

据我们所知，我们首次观察到 Triton X-100 (TX-100) 在水和环己烷中的双光子和三光子荧光。观察到的多光子荧光 (MF) 落在 280-340nm 的紫外区域，就像它的单光子荧光一样。研究了激发波长和溶液浓度对荧光光谱的影响。我们找到了获得最强 MF 的最佳激发波长和溶液浓度。对于相对较弱的三光子荧光，由于其信噪比小，其光谱存在波动。峰值波长在 300nm 左右，仅随溶液浓度、溶剂类型和激发波长的不同而略有变化，这与其他发光体有很大不同。这项工作将MF的波段扩展到280-340nm的紫光和紫外区，并将TX-100的研究扩展到非线性光学领域。研究结果可能在未来用于紫外MF检测和制造紫外多光子激光器。虽然对于后一种情况，要提前提高其荧光效率和受激发射截面还有很长的路要走。