新型AFM探针的制备及应用

采用熔拉 -腐蚀复合方法 ,将普通单模石英光纤制成直锥形光纤探针。利用自制工具将探针打弯 ,制成悬臂式光纤探针 ,在AFM上取得了较理想的测试结果。将自制光纤探针和商用硅材料探针获得的两种扫描图像进行了对比 ,分析了悬臂式光纤探针的特点     

半导体中多光子吸收跃迁速率的全量子理论分析

本文从非线性光学中辐射跃迁速率的表达式出发,在全量子理论下,导出了半导体中任意阶多光子吸收跃迁速率的一般表达式。理论分析结果表明,n光子吸收跃迁速率与光强的n次方和n阶光子相干度成正比。本文在多能带及二能带理论模型下,对多光子吸收跃迁速率的一般表达式进行了化简,并对非线性相互作用项对跃迁速率的贡献,作了讨论。     

氩缓冲气体对铯原子共振滤光器特性的影响

铯原子共振滤光器(Cs-ARF)是目前实现蓝绿激光水下通讯的一种关键元件。本文详细研究了不同气压氩缓冲气体对Cs-ARF特性的影响,明显改善了Cs-ARF的响应速率和辐射转换效率。还研究了氮气及不同器件结构对Cs-ARF特性的影响。     

富勒烯光限幅技术研究新进展

介绍了富勒烯激发态吸收光限幅以及激发态吸收和其它非线性光学效应共同作用的复合型光限幅技术的研究新进展。分析了今后的研究方向。     

Gauge-invariant treatment of the exponential decay of an unstable atomic state

Summary By using a self-consistent projection-operator method, developed recently by the present author, a gauge-invariant Markovian treatment of the spontaneous decay of an unstable atomic state is presented. Without ignoring retardation and electron-spin effects a gauge-invariant result for the probability amplitude of finding the atom in the unstable state is obtained.     

双原子系统中原子非经典特性与光场非经典特性的关联

本文研究了双原子与双模光场相互作用系统中，双原子分崩离析有压缩与双模光场二阶压缩间的对称关系。揭示了原子间关系和光场模间关联的转换特性，并探讨了失谐量，耦和常数对原子非经典特性与光场非经典特性间关联的影响。     

分析卤化银微晶的EDS方法探讨

本文探讨了用Ｘ射线能谱仪（ＥＤＳ）分析卤化银微晶的空间分辨率和吸收修正问题。对ＳＥＭ－ＥＤＳ和ＳＴＥＭ－ＥＤＳ两种不同分析模式的空间分辨率进行计算，表明ＳＴＥＭ－ＥＤＳ是研究单个卤化银微晶内碘的含量及分布的有效方法。并对定量分析数据和吸收修正参数进行了讨论，结果证明微晶不同区域厚度的差异，对碘含量的定量测定的影响可以忽略。     

Zeeman transitions in deuterium atoms induced by ultra-relativistic electrons

We present data showing hyperfine transitions in an atomic deuterium beam induced by the (476 MHz) radio-frequency field of a 704 MeV electron beam in a storage ring. A polarized deuterium beam, produced in an atomic beam source, was crossed with a stored electron beam and analyzed with a Breit--Rabi polarimeter. Electron-beam induced transitions were singled out by injecting different combinations of hyperfine states. Transition probabilities as high as 70% were measured at large currents (~ 100 mA). All possible deuterium transitions for a radio-frequency of 476 MHz were observed. In addition, a 1--6 transition resulting from the first harmonic (952 MHz) was observed. The effects of these transitions are of general importance for the polarized internal target technique applied in nuclear and particle physics experiments. The data are reasonably described by numerical estimates. The observed mechanism can be exploited to create nuclear polarized atoms when injecting electron polarized atoms with no net nuclear polarization into a storage cell. However, when nuclear polarized atoms are injected, care should be taken to avoid this mechanism, since it would result in depolarization of the atoms. The studies enabled us to choose the magnetic guide field during our spin-dependent electron--deuteron scattering experiments, such that electron-beam induced depolarizing effects were avoided. This revised version was published online in July 2006 with corrections to the Cover Date.     

负电子亲和势GaAs光电阴极中的三光子激发和发射的理论研究

将三阶微扰理论应用于单晶GaAs半导体,结合与实际相接近的能带结构,得到了GaAs中三光子吸收系数的解析式表达式,在考虑了激发电子的逃逸过程的情况下,进而推导了负电子亲和势GaAs光电阴极中三光子光电发射的发射系数的解析表达式.两表达式得到的理论数值分别与用ns量级脉宽、2.06μm波长的激光测得的GaAs中三光子吸收系数和GaAs(Cs,O)光电阴极中三光子发射系数的实验值相比较,吻合较好.