微微秒叶绿素染料激光器的研究

本文报道用一台对撞脉冲锁模Nd:YAG激光器的三倍频光作为泵浦光源,采用超短腔结构,获得叶绿素的红色ps脉冲激光输出的装置和实验结果。研究了叶绿素a和b在各种聚合状态下输出激光波长随染料浓度的变化关系,当叶绿素a-乙醇溶液浓度为2×10~(-3)M,激光腔长<36μm时可获得单模调谐ps系列脉冲输出,激光束的发散角≈60mrad。     

从相关测量的数据恢复超短激光脉冲的波形

本文证明了,只要测量了脉冲光强的二阶相关函数G~(2)(τ)和单延迟的三阶相关函数G~(3)(τ),便可以恢复超短激光脉冲的强度波形。并提出一种恢复脉冲波形的计算方法,编制了计算机程序,对实验数据作了处理,证实这种计算方法是可行的。在此基础上建议一种通过相关测量确定超短激光脉冲波形的新型仪器。     

STUDY OF THE DEEP INELASTIC SCATTERING OF 12C ON 27AI

The deep inelastic scattering of 71.5 ¹²C ions on a ²⁷Al target was measured.ΔE-E telescope was used to identify the reaction products.The contour plots in the E-θ plane for the measured cross sections in the C.M.S.for B and Be show the generalfeatures of quasi-elastic scattering at grazing angles and the deep inelastic scatteringridge extending from smaller angles and flattening at larger ones.Two special featuresmay be worthwhile to mention.First,there are some fine structures near the Q.E.peak.Secondly,the average C.M.kinetic energy of the completely damped part is notequal to the Coulomb energy of the final state.     

Y(Co1-xCux)5中子衍射研究

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质子轰击条形结构InGaAsP/InP内调Q DH双稳态激光器

本文报道一种质子轰击条形结构内调Q InGaAsP/InP DH双稳态激光器(简称BSDH)。该激光器具有典型的光输出双稳态特性,实验测得两个典型样品的双稳态工作区电流跨度△I分别为50mA,200mA,它随器件结构参数的选取而异,值得指出的是在不同注入电流下观察到高态激光输出呈单纵模稳频特性,峰值波长λ₀=1.2596μm,频率(波长)稳定度优于10^-5,本文对上述现象从物理上进行了定性的讨论。 关键词：     

5—25keV刻度用X射线发生器

利用轫致辐射激发原子产生X射线荧光,经吸收边过滤,研制成单色低中能X射线发生器。实验给出5—25keV能区的4个单能点的强度、纯度以及相应的剂量率,可供刻度使用。     

ANGULAR MOMENTUM CORRELATION OF FRAGMENTS IN DEEP INELESTIC COLLISIONS

The role of the non-diagonal difusion coefficient D12 of the two dimensional F-P EQ. In the mean value of angular momentum of fragments, their varaince and covaraince are discussed. It is found that D12 doesnot influence the equilibrium value of the quantities, but influences the rate for the quantities to reach equilibrium. So that it mainly influences the angular momentum transfer at the beginning of the reaction and that of large incident angular momentum partial waves. We also find that the covaraince is especially sensitive to D12.     

用能化电子效应考察二次离子的发射机理

用能化电子改变样品的表面势,测量多种二次离子产额的能谱,发现在通常条件下,特别当存在氧增强发射时,离子的存活几率不为共振电子隧道效应所影响。动力学参量的数据表明,决定离子产额的表面势是高度局域的。并可推论电子束照射对二次离子质谱的定量分析可起有益的效用。 关键词：