Vibrational relaxation study in carbonyl containing molecule: role of hydrodynamic and dispersion forces

The isotropic Raman component of the C = O stretching mode of ethyl acetate (EA) was analyzed using various polar and nonpolar solvents. It was found that the bandshape approaches towards Lorentzian at high dilution using the curve‐fitting method. The isotropic Raman band was also analyzed by estimating the correlation coefficient with reference to the Lorentzian lineshape using a simple method of linear‐curve fitting. The effects of dispersion and hydrodynamic forces on bandwidth were studied in details. The vibrational relaxation rate was studied using certain parameters and it was found that the microscopic based parameter can explain the complexities occurring in solute–solvent interactions. Copyright © 2007 John Wiley & Sons, Ltd.     

非单色光抽运的光参量啁啾脉冲放大的带宽及增益特性研究

采用傅里叶变换的方法将脉冲光分解成不同的频率成分,建立了非单色光抽运的光参量放大耦合方程组的数值求解模型.研究了非单色抽运光对光参量啁啾脉冲放大的小信号增益、大信号增益以及增益带宽的影响.非单色抽运光降低参量放大的增益水平,但同时可提高增益带宽,且抽运光谱宽越宽,对增益带宽的提高作用越大.还进一步从相位失配和参量带宽的角度分析了非单色抽运光使参量放大的增益降低、带宽增大的原因. 关键词： 光参量啁啾脉冲放大 非单色光 增益带宽 飞秒激光     

Electro-optical modulator using SiO2 waveguides with thermal poling on a Si substrate

A novel optical modulator using SiO₂ waveguides on a silicon substrate is proposed. The modulator is analyzed and designed with the finite element method. The numerical results have shown that an optimally designed modulator can give a broad bandwidth, good impedance match, and low cost. The proposed modulator can be fabricated easily using Si-based very large-scale integrated technology, and it is very suitable for opto-electronic integrated circuits.     

二维介质柱光子晶体波导的优化设计

通过改变靠近导光区域介质柱的直径和周期,优化设计了二维介质柱光子晶体波导.结果表明：单独增大和减小柱的直径以及增大柱的周期不能提高波导的传输特性;单独减小柱的周期能提高波导的传输特性,获得传输系数小于1 dB,带宽80 nm的波谱;同时减小柱的直径及周期能够极大的提高波导的传输特性,得到了带宽为150~250 nm,传输系数小于1 dB的波谱.     

绿光波段60 pm超窄带滤光片的研制

波长为532 nm的绿色激光在大气层中有较强的穿透能力,可用于自由空间光通信和激光三维测绘,为了抑制背景光的干扰,需要半功率带宽小于100 pm的光谱滤波器。因此,设计并研制了基于光学干涉薄膜的超窄带滤光片。将五氧化二钽(Ta₂O₅)和二氧化硅(SiO₂)分别作为高低折射率膜层材料,将熔石英作为基片,采用双离子束溅射沉积方法制备出所设计的光学薄膜。利用可调谐激光器和功率计测量滤光片的透射光谱,其半功率带宽为(60±2)pm,透过率达到62.6%。