双光子吸收

In this paper, progress in two-photon-absorbed organic materials is reviewed, and the new development of three-dimensional optical data storage based-on these materials is introduced.

本文在综述近年来双光子吸收有机材料研究的基础上，介绍了双光子吸收有机材料在三维数字光存储中应用研究的最新进展。

In addition, the two-photon absorption cross section σ non-linearly increased with a ratio of 1∶2.8∶3.7, which is near to the ratio of the square of branching number n2 (1∶2.25∶4), indicating a remarkable cooperative enhancement of σ in the multi-branched pyrazine derivatives.

另外， 从双支到四支结构，双光子吸收截面σ按照1∶2.8∶3.7的比例增加，接近于支链数目的平方之比(1∶2.25∶4)，表明多支结构的双光子吸收存在显著的增强效应，其中四支结构的σ值为1007 GM。

The geometry, electronic structures and electronic spectra of trans stilbene derivatives are systematically studied by PM3 and INDO/CI methods.

分子在强激光束作用下，能同时吸收两个光子的现象称为双光子吸收。

In addition, the nonlinear processes such as cross-phase modulation, non-degenerate two-photon absorption, and stimulated Raman scattering must also be considered for double wavelengths propagating in waveguide.

在归纳分析了SOI对光信号处理的研究进展的基础上，进一步完善了超快脉冲在脊形硅波导中演变时所满足的线性和非线性传输方程，在此非线性方程中包括波导线性损耗、群速度色散和三阶色散等线性效应；同时也包含了自相位调制、简并双光子吸收、自由载流子吸收和自由载流子色散等非线性过程；当双光场在波导中传输时，脉冲之间的交叉相位调制、非简并双光子吸收和受激拉曼散射效应等非线性效应也被考虑。

Compared with 3, 6-carbazo derivatives, the OPA wavelengths of 2, 7-carbazole derivatives are bathochromic shift and the oscillator strength increased; the TPA wavelengths are red-shifted and the TPA cross-section increased.

与3， 6-咔唑衍生物相比，2， 7-咔唑衍生物的单光子吸收波长红移，振子强度增大；双光子吸收波长红移，双光子吸收截面增加。

The results indicate that, three-dimensional double-porphyrin derivatives with butadiyne linkages have very large TPA cross section, which is a promising direction for further development of novel TPA materials.

研究发现，以丁二烯为连接桥的三维双卟啉衍生物具有大的双光子吸收截面，是一类有应用前景的双光子吸收材料。

The enhanced two-photon absorption found in these chromophores was attributed to the fact that the multibranched chromophores had both an extended π-conjugated system and an increased intramolecular cooperative effect compared to the one-branched chromophore.

这些多枝结构化合物的双光子吸收截面较大，双光子吸收增强来源于多枝分子中扩展的π共扼体系和重复单元的协同效应。

The two-photon absorption cross-sections of these styryl derivatives were determined by Z-scan technique, and the benzothiazolium derivatives exhibited the largest TPA cross-sections (10〓s·cm〓/photon) and the best power limiting ability at high operable incident intensity. The results show that the benzothiazolium derivatives are promising organic compounds as two-photon absorption optical limiting materials. 2. Several organic dyes active to 800nm femtosecond laser with D-π-A structure were designed and synthesized.

研究了它们的上转换荧光、上转换激射和光限幅行为，通过改变染料分子共轭体系的大小，首次实现了在576nm-635nm范围内的双光子上转换激光波长的调节，其中噻唑啉碘盐类二苯乙烯化合物的双光子上转换激射峰（576nm）是迄今在1064nm皮秒激光作用下能够得到的最短波长的激光；阴离子显著改变上转换激射效率，但对上转换荧光峰和激射峰的位置影响很小；增加溶液的浓度，上转换荧光光谱和激射光谱红移，并在一定的浓度范围内，能够有效的提高上转换激射效率；利用Z-扫描技术测定了染料分子的双光子吸收截面，发现苯并噻唑类染料分子的双光子吸收截面高达10〓s·cm〓／photon，而且在较大的入射光强范围内，这类染料分子具有较大的光限幅能力，是一类作为双光子吸收光限幅材料很有潜力的染料分子。

The geometries, electronic structures, one- and two-photon absorption spectra for a series of dendritic molecules have been studied.

与偶极矩化合物相比，八极矩分子具有更高的透明性和更大的双光子吸收截面，是更有前途的双光子吸收材料。

The peakpositions of the TPA spectra of this series of compounds are located at ～950 nm, and thecorresponding maximal TPA cross-section has been measured to be as large as〓.

双光子吸收谱的谱形与线性吸收谱相应波段内的谱形相似，与线性吸收的峰值波长的两倍相比较，双光子吸收峰值波长有微小蓝移。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。