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Two-photon resonance-enhanced refractive-index change and self-focusing in a dye-solution-filled hollow fiber system

机译：填充染料溶液的中空纤维系统中双光子共振增强的折射率变化和自聚焦

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The general behavior of two-photon absorption-enhanced refractive-index change in a third-order nor.-linear optical .medium is briefly described. The nonlinear medium ,was the solution of a new dye,trans-4-[p-(N-hydroxyethyl-N-methylamino)styryl]-N-methylpyridinium iodide (ASPI) in dimethyl sutfoxide as the solvent, that was poured into a 20-cm-long quartz hollow fiber of 100-μm internal diameter. This dye solution has a strong two-photon absorption and subsequent upconversion fluorescence emission when excited with 1064-nm laser radiation. When the input peak intensity reached 500-1500-MW/cm↑(2) levels, obvious changes in beam profiles of the output IR laser beam were observed due to a self-focusing or self-trapping process occurring inside the fiber system. As a result of this process, highly directional frequency-upconverted superradiant lasing output was obtained with a beam size ~5 times smaller than that of a linearly transmitted He-Ne probe laser beam. The demonstrated mechanism can be Useful for fiber laser-amplifier and fiber-integrated optics devices. # 1997 Optical Society of America
机译：简要描述了三阶非线性光学介质中双光子吸收增强的折射率变化的一般行为。非线性介质是一种新型染料，即反式-4- [对-（N-羟乙基-N-甲基氨基）苯乙烯基] -N-甲基碘化碘（ASPI）在二甲基亚砜中的溶液，将其倒入20厘米长的石英中空纤维，内径为100μm。当用1064 nm激光辐射激发时，这种染料溶液具有很强的双光子吸收和随后的上转换荧光发射。当输入峰值强度达到500-1500-MW / cm↑（2）时，由于光纤系统内部发生了自聚焦或自陷过程，因此观察到了输出IR激光束的光束轮廓发生明显变化。作为该过程的结果，获得了具有高度方向性的频率上变频的超辐射激光输出，其光束尺寸比线性传输的He-Ne探针激光束小〜5倍。所展示的机制对于光纤激光放大器和光纤集成光学器件可能很有用。 ＃1997美国眼镜学会

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