猴子的大脑皮层主要由灰质和神经元组成,是大脑中调控行动和思维的区域。 选取在生命成长过程中具有代表性的3个年龄段(幼年、成年、老年)猴子的大脑皮层组织,首次测得其拉曼光谱。 实验结果显示,3个不同年龄段的猴子大脑皮层的拉曼光谱最明显的差异表现在1000-1400 cm-1和2800-3000 cm-1范围内。 随着年龄的增长,归属于脂类的拉曼峰1313和2 885 cm-1的强度越来越强,而归属于蛋白的拉曼峰1 338和2 932 cm-1的强度却逐渐减弱,并且在老年猴子大脑皮层的拉曼谱中出现了2个归属于脂类的拉曼峰1 296和2 850 cm-1,I1313/I1338和I2885/I2932的变化趋势很好地描述了这种差异。 研究表明,随着年龄的不断增长,猴子大脑皮层中脂类的含量逐渐增加,这样可以很好地说明大脑皮层中脂类的聚积是导致衰老的一个重要原因,为进一步研究人类和动物的生命活动规律、疾病的形成机理提供了很有价值的参考。

利用飞秒自适应脉冲整形相干控制技术成功实现了甲醇溶液中甲基对称(νs(CH₃)2832cm^－1)和反对称(νAs(CH₃)2948 cm^－1)振动能级相干反斯托克斯拉曼光谱(CARS)的选择激发。为了进一步探究双光束飞秒CARS光谱实现选择激发的机制，采用二次谐波频率分辨光学开关(SHG－FROG)测量方法对整形前后的泵浦激光脉冲进行了探测。SHG－FROG痕迹结果显示裁剪泵浦光中的有效频段可实现飞秒CARS的选择激发。研究表明飞秒自适应脉冲整形相干控制技术对于复杂分子系统飞秒CARS的选择激发研究具有非常重要的科学意义。

Dependence of surface-enhanced Raman scattering (SERS) from Calf thymus DNA on anions is investigated. With the silver colloid, the bands at 732, 960 and 1333 cm-1 for adenine (A), 1466 cm-1 for deoxyribose, and 1652 cm-1 for the C=O group of thymine (T) are observably enhanced. With the presence of the Cl- or SO^(2-)_(4) anions, the bands at 732 and 1326/1329 cm-1 for the symmetric stretching and skeletal vibrational modes of adenine (A) are dramatically enhanced, and the enhancement effect with the SO^(2-)_(4) ion is more than that with the Cl_ ion. The experimental results show that the DNA molecule can be adsorbed on the silver colloid particles through the C6N and N7 of adenine (A), the C=O of thymine (T) and deoxyribose. Moreover, the formed hydrogen bonding of the Cl_ or SO^(2-)_(4) ions to the C6NH2 group of adenine (A) can induce larger C6N electronegativity, which is favor for the C6N/N7 cooperative adsorption on the (Ag)^(+)_(n) colloid particles.

利用带有环形回路的干涉探测装置,研究了光程差精确为零时参考光和探测光的相干振荡信号,对数据的拟合给出了相干声子诱导的折射率相关变化.由信噪比较高的反射率相位变化信号,不仅清楚地辨别出铝膜中的四种相干声子模式,还分辨出声子回波信号.

采用旋涂法制备了一种五甲川花菁染料的超薄膜，利用激光诱导瞬态光栅的方法研究染料薄膜的三阶，乃至更高阶的非线性光学特性。通过理论计算得到了该样品在不同浓度下的非线性光学信号的响应时间(59～102 ps)，分析表明花菁染料五甲川链上的π－π^*电子跃迁是引起该染料薄膜非线性光学效应(20．5×10^－13esu～30．3×10^－13esu)的主要原因。研究结果表明激光诱导瞬态光栅是研究介质高阶非线性光学特性一种非常有意义的实验方法。

采用基于遗传算法(Genetic algorithm)的自适应反馈系统，成功实现了二溴甲烷多个拉曼振动模式的选择激发。通过脉冲分析方法(二次谐波频率分辨光谱开关和二次谐波交叉频率分辨光谱开关)(SHG－FROG和SHG－XFROG)，在时域和频域上对优化脉冲进行还原和分析，结果表明：空间光学调制器(SLM)将优化脉冲调制成具有负啾啁特性的脉冲串。该选择激发实验的成功实现验证了相干控制自适应系统在研究复杂分子系统方面具有良好的应用前景。

采用旋涂法制备了一种五甲川菁染料的超薄膜,利用原子力显微,椭偏仪、UV-Vis吸收光谱、红外光谱、小角X射线衍射等对薄膜的形貌和线性光谱性质进行了研究表征,结果表明染料在薄膜中形成了有序而稳定的J-聚集体,前向简并四波混频(DFWM)技术研究表明由于分子的聚集作用引起三阶非线性极化率的增大(χ(3)=2.55×10-12 esu),利用激子耦合模型初步分析和讨论了产生非线性效应增强的内在机制.

A self-organized thin film of a cyanine dye is fabricated by the spin-coating technique and is characterized by ultraviolet-visible spectroscopy, infrared (IR) spectroscopy, small-angle X-ray diffraction, ellipsometer, and atomic force microscopy (AFM). The nonlinear optical properties of the thin films are investigated by degenerate four wave mixing (DFWM) technique. The cyanine dye thin film sample exhibits high optical nonlinearities ('chi(3)=2.55*10^(-12) esu), and the mechanism is analyzed by the exciton coupling theory.

The dynamics of the femtosecond pulse propagation in a plasma channel is investigated by the pump-probe longitudinal diffractometry and second harmonic generation frequency-resolved optical gating (SHG-FROG) technique. The spatial characteristics, corresponding to the electronic density and the size of the channel, can be observed by the recorded ring pattern, and the spectral and temporal characteristics are recorded by the SHG-FROG traces. The spatiotemporal characteristics will help us to better understand the dynamics of the plasma induced by the femtosecond pulse and the femtosecond pulse propagating in the plasma channel.

利用零色散脉冲整形装置的模型,从理论上详细讨论了4f结构脉冲整形装置中第一光栅和第一凸透镜之间距离失调、两凸透镜之间距离失调以及第二凸透镜与第二光栅之间距离失调对输出脉冲空间特性的影响.