色散缓变光纤中的调制不稳定性分析

研究了色散缓变光纤中调制不稳定效应,得到了增益谱与光纤纵向色散参量的一般关系式.结果表明,色散缓变光纤较常规光纤具有较宽的增益谱.选取色散级变光纤的色散参量可以获得较大的增益带宽.数值模拟显示,利用色散缓变光纤中的调制不稳定性可以产生高重复率的基本孤子脉冲串.     

线阵CCD相机细分采样成像的像质研究

从理论上推导了线阵CCD相机间歇细分采样和连续细分采样成像所得到的光电图像调制度和调制传递函数公式,并讨论了这两种采样方法对提高动态成像调制传递函数的不同效果,分析比较了它们的特点和工程应用的可能性.     

Nonlinear dynamics of the dual-wavelength CO2 laser

Theoretical studies have been made of the nonlinear-dynamic modes of operation of a dual-wavelength CO₂ laser with continuous pumping by electric discharge and loss modulation in one of the lasing channels. It is shown that by varying the modulation depth and frequency, it is possible to control, over a fairly wide range, the time and energy parameters of lasing in both channels, going from regular to chaotic modes of operation. Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 67, No. 3, pp. 316–321, May–June, 2000.     

含时调制的Jaynes-Cummings模型的Pancharatnam相位

基于含时调制的Jaynes-Cummings模型的SU(2)群结构,求得它的Pancharatnam相位,并分析 了该模型从绝热开启直到关闭原子与场的相互作用的整个过程的相位变化.讨论了该模型在 半经典近似条件下的情况. 关键词： 含时调制的Jaynes-Cummings模型 Pancharatnam相位 SU(2)群     

尾波场与相对论效应对激光脉冲自相位调制及频移影响的比较研究

对共振和非共振情形下尾波场效应与相对论效应对强激光脉冲在稀薄等离子体中传输的影响 作了详细比较.尾波场效应导致脉冲自相位调制的不对称性，其大小与初始脉冲形状和脉宽 大小有关.在长脉冲极限下，尾波场效应远小于相对论效应，从而可以忽略；在短脉冲极限 下，尾波场效应可以抵消相对论效应.在共振情况下，尾波场效应导致脉冲内大部分光子减 速. 关键词： 脉冲传输 等离子体 相对论效应 尾波场效应 自相位调制     

CO2分子的近红外可调谐二极管激光吸收光谱高灵敏探测

利用近红外可调谐半导体二极管激光用直接吸收光谱技术和波长调制光谱技术初步观测了CO2在1.31 m附近的吸收.从实验结果可以看出,在4.5torr压力下,可探测最小吸收线强度为3.769×10-27μcm-1/(molecule·cm-2),相应的信噪比是16.8.     

Proper Tuning of Comprehensive Two‐Dimensional Gas Chromatography (GC×GC) to Optimize the Separation of Complex Oil Fractions

Comprehensive two‐dimensional gas chromatography (GC×GC) is an utterly suitable separation technique for the analysis of complex samples, such as oil fractions. Once the two columns and the operating conditions are properly tuned, the technique is able to provide a detailed characterization of such materials. Some considerations applying to the tuning of a GC×GC system for a specific separation are presented and discussed. The authors present a number of different column sets and conditions which allow the separation of a non‐aromatic hydrocarbon solvent, a kerosene, the light end of a crude oil, and an olefinic fraction, respectively. The highly structured GC×GC chromatograms, together with chemical knowledge about the samples, provide a much more comprehensive characterization of the samples than hitherto possible.     

GC3: Comprehensive Three‐Dimensional Gas Chromatography

Comprehensive three‐dimensional gas chromatography (GC³) is demonstrated using modified GC×GC apparatus. A new thermal modulation scheme employing a single moving heater to operate two thermal modulators is introduced. Considerations of the bandwidth/resolution tradeoff of GC³ show that high‐speed tertiary columns would make GC³ practical, with modest loss of underlying GC×GC peak capacity.     

I-Q矢量调制器在噪声干扰模拟器中的应用分析

介绍了I-Q矢量调制器的工作原理、典型调制电路及控制部件的概念,并叙述了其在噪声干扰模拟器中的具体应用。     

LiNO3-Based Electrolytes via Electron-Donation Modulation for Sustainable Nonaqueous Lithium Rechargeable Batteries

LiPF₆ as a dominant lithium salt of electrolyte is widely used in commercial rechargeable lithium-ion batteries due to its well-balanced properties, including high solubility in organic solvents, good electrochemical stability, and high ionic conductivity. However, it suffers from several undesirable properties, such as high moisture sensitivity, thermal instability, and high cost. To address these issues, herein, we propose an electron-donation modulation (EDM) rule for the development of low-cost, sustainable, and electrochemically compatible LiNO₃-based electrolytes. We employ high donor-number solvents (HDNSs) with strong electron-donation ability to dissolve LiNO₃, while low donor-number solvents (LDNSs) with weak electron-donation ability are used to regulate the solvation structure to stabilize the electrolytes. As an example, we design the LiNO₃-DMSO@PC electrolyte, where DMSO acts as an HDNS and PC serves as an LDNS. This electrolyte exhibits excellent electrochemical compatibility with graphite anodes, as well as the LiFePO₄ and LiCoO₂ cathodes, leading to stable cycling over 200 cycles. Through spectroscopy analyses and theoretical calculation, we uncover the underlying mechanism responsible for the stabilization of these electrolytes. Our findings provide valuable insights into the preparation of LiNO₃-based electrolytes using the EDM rule, opening new avenues for the development of advanced electrolytes with versatile functions for sustainable rechargeable batteries.