宽束冷阴极和部端霍尔离子源对薄膜透过率和应力影响的比较

在宽束冷阴极离子源和端部霍尔离子源辅助沉积情况下，利用南光ZZS700 1/G箱式镀膜机，通过实验分别验证了这两种离子束辅助沉积对光学膜层透过率和应力的影响。通过对大量实验数据进行分析，得出利用低能量和大电流离子束辅助沉积光学薄膜时，膜层性能优于高能量离子束辅助沉积膜层。分析了膜层特性改变的原因，并提出了合理的工艺参数。实验结果表明，低能量、大电流的离子束辅助沉积使光学薄膜的性能更佳。     

时间延迟激光感生双光栅的理论及实验研究

从理论上分析了激光相位及振幅的随机涨落对由热效应引起的时间延迟激光感生双光栅(TDLIDG)的影响.结果表明,四波混频信号调制的振幅随两束泵光相对延迟的增加而衰变.实验结果与理论预测基本一致.我们还证实用TDLIDG测量两束光的波长差可以达到与激光线宽同一量级的精度.     

Studies on pyrrolidinones: Some attempts to improve the synthesis of methyl n‐(3,4,4′,5‐tetramethoxybenzhydryl)pyroglutamate (hei 81) by using n‐acyl iminium salts methodologies

Some ways to use the N‐acyl iminium salt methodologies to synthesize a new inhibitor of tubulin polymerization, methyl N‐(3,4,4′,5‐tetramethoxybenzhydryl)pyroglutamate (HEI 81) were studied. The most interesting reactions utilize a new pyroglutamic lactone (3‐(3,4,5‐trimethoxyphenyl)dihydropy‐rrolo[1,2‐c]oxazole‐1,5‐dione).     

An heuristic derivation for the rate of change of the orbital period of a relativistic binary system

We present an heuristic derivation for the rate of change of the orbital period (at the post-newtonian level) of a semi-relativistic binary as due to emission of gravitational radiation. We assume a couple of physically reasonable hypotheses taking into account the literature on the subject.     

Li ion mobility in TeO2---LiO0.5---LiX (X = F, Cl) glasses determined by Li NMR and impedance spectroscopy

NMR and impedance spectroscopies have been used to study the Li⁺ ion mobility in the TeO₂---LiO_0.5---LiX (X = F, Cl) glasses. Activation energies determined from the temperature dependence of dc conductivity data decrease as the lithium or halogen content increases. Activation energies deduced from the analysis of the ac conductivity data in the complex modulus formalism and corresponding to the true one-particle energy barrier of ionic motion according to the coupling model, have been compared to those deduced from NMR data (T₁⁻¹ relaxation time): a good agreement is obtained. Finally, the influence of the glass composition and ion distribution on Li⁺ ion mobility has been discussed.     

Rare Earth Ion Doped Non Linear Laser Crystals

We show how non linear crystals activated with Yb^3? or Nd^3? ions can be used to develop diode pumped solid state lasers emitting in the visible region of the electromagnetic spectrum. For this purpose we have selected relevant examples of systems investigated in our laboratory.