Amplified Spontaneous Emision of K_2 Yellow Band Excimer and Its Gain Measurement by e-beam-pumping

ＡｍｐｌｉｆｉｅｄＳｐｏｎｔａｎｅｏｕｓＥｍｉｓｉｏｎｏｆＫ２ＹｅｌｏｗＢａｎｄＥｘｃｉｍｅｒａｎｄＩｔｓＧａｉｎＭｅａｓｕｒｅｍｅｎｔｂｙｅ┐ｂｅａｍ┐ｐｕｍｐｉｎｇＸＩＮＧＤａ１）ＷＡＮＧＱｉ２）ＴＡＮＳｈｉｃｉ１）（１）Ｉｎｓｔｉｔｕｔｅｏｆ...     

双参数变形多模玻色算符的代数结构及其应用(Ⅱ)

给出了双参数变形量子代数ＳＵ（２）ｑ，ｓ和ＳＵ（１，１）ｑ，ｓ的多模Ｊｏｒｄａｎ－Ｓｃｈｗｉｎｇｅｒ实现。     

由拉曼谱线强度变化研究C_(60)分子的内模振动

由拉曼谱线强度变化研究Ｃ６０分子的内模振动王建模高长连刘正东１）陶向阳辛建之罗宏雷２）肖新民（江西师范大学物理系南昌３３００２７）（１）浙江大学物理系杭州３１００２７）（２）杭州三维高科技产业公司杭州３１００１２）ＳｔｕｄｙｔｈｅＩｎｎｅｒ┐Ｍ...     

Properties of Amplitude N th-power Squeezing of Even and Odd qs-Coherent States

ＰｒｏｐｅｒｔｉｅｓｏｆＡｍｐｌｉｔｕｄｅＮｔｈ┐ｐｏｗｅｒＳｑｕｅｅｚｉｎｇｏｆＥｖｅｎａｎｄＯｄｄｑｓ┐ＣｏｈｅｒｅｎｔＳｔａｔｅｓＷＡＮＧＪｉｓｕｏ１）ＳＵＮＣｈａｎｇｙｏｎｇ１）ＨＥＪｉｎｙｕ２）（１）ＤｅｐａｒｔｍｅｎｔｏｆＰｈｙｓｉｃｓ...     

棱镜产生最小偏向角的充要条件

光学教程分析了棱镜产生最小偏向角的必要条件,但其讨论过程不易被初学者所理解,且没有涉及产生最小偏向角的充分条件．本文将对其做适当改进,使之更简明、更完善． 如图１所示,ＳＢ为入射光线,经棱镜折射后成为ＣＳ′,两光线夹角θ称为偏向角．由图１知： 按折射定律有： ｉ１＝ａｒｃ ｓｉｎ（ｎｓｉｎ ｉ１）, ｉ′１＝ａｒｃ ｓｉｎ［ ｎｓｉｎ（ａ－ ｉ２）］,θ＝ａｒｃ　ｓｉｎ（ｎｓｉｎ　ｉ２）＋ａｒｃ　ｓｉｎ［ｎｓｉｎ（ａ－ｉ２）］－ａ（２）（２）式表明,θ随ｉ１的改变而改变,而偏向角有一最小值的必要条件是： …     

Study on FPS Optical Interconnection Realized by 2×2 Holographic lens Array

１ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅＦｏｌｄＰｅｒｆｅｃｔＳｈｕｆｌｅ（ＦＰＳ）ｏｐｔｉｃａｌｉｎｔｅｒｃｏｎｎｅｃｔｉｏｎｉｓｔｈｅ１ＤＰｅｒｆｅｃｔＳｈｕｆｌｅ（ＰＳ）ｏｐｔｉｃａｌｉｎｔｅｒｃｏｎｎｅｃｔｉｏｎｒｅａｌｉｚｅｄｂｙｍｅａｎｓｏｆ２...     

几种哌嗪类抗肿瘤化合物的拉曼光谱

几种哌嗪类抗肿瘤化合物的拉曼光谱刘社文１梁二军１李祥杰２（１郑州大学河南省激光应用技术重点实验室，２郑州大学化学化工学院，郑州４５００５２）ＲａｍａｎＳｐｅｃｔｒａｏｆＳｅｖｅｒａｌＡｎｔｉｔｕｍｏｒＰｉｐｅｒａｚｉｎｅｓＣｏｍｐｏｕｎｄｓＬｉｕＳｈ...     

用无约束最优化方法拟合布里渊散射数据中存在的问题的讨论

用无约束最优化方法拟合布里渊散射数据中存在的问题的讨论王越１）刘玉龙２）蒋毅坚１）曾令祉１）（１北京工业大学应用物理系１０００２２）（２中科院物理所１０００８０）ＤｉｓｃｕｓｉｏｎｏｎＤａｔａＦｉｔｏｆＢｒｉｌｏｕｉｎＳｃａｔｅｒｉｎｇｂｙＵｎｃｏｎ...     

两种新合成卟啉的拉曼和表面增强拉曼光谱

两种新合成卟啉的拉曼和表面增强拉曼光谱叶晓岚１邓文杰２梁二军３刘社文３（１．杭州大学化学系杭州３１００２８２．杭州师范大学化学系杭州３１００１２３．郑州大学物理工程学院郑州４５００５２）ＮｏｒｍａｌａｎｄＳｕｒｆａｃｅ┐ＥｎｈａｎｃｅｄＲａｍａｎＳｐ...     

激光诱导镁原子S—S,S—D禁戒跃迁

报道在镁金属蒸气中利用两束激光三光子共振激发原子３ｓｎｐ１Ｐ中高里德堡态时，观察到随泵浦激光功率的增强，出现３ｓ４ｓ１Ｓ０－３ｓｎｓ１Ｓ０、３ｓｎｄ１Ｄ２（ｎ≈１８～３２）偶宇称态偶极禁戒跃迁增强，以及３ｓｎｓ１Ｓ０能级移动现象，并解释为光泵过程引起的原子激发态碰撞效应。利用禁戒跃迁首次测定了Ｍｇ３ｓｎｓ１Ｓ０（ｎ＝２２～３０）能级。     

Performance Improvement in Fiber-Optic Spectrometers Using Photonic Crystal Fibers

Abstract

Resolution enhancement of a high-speed fiber-optic spectrometer is investigated in this article. The operation of these types spectrometers is based on conversion of the spectral-domain signal into the time domain by a dispersive element. A photonic crystal fiber is used as a dispersive fiber in this spectrometer. Resolution enhancement of considered spectrometer with photonic crystal fibers is studied. The fiber loss and length minimization in this spectrometer are obtained. Simulation results show that an increase in resolution will cause a decrease in the speed of the spectrometer. Trade offs between resolution and speed are studied.     

高分辨率MPT全谱仪的研制及性能测试

研制了采用模块化设计的高分辨率MPT全谱仪。新研制的MPT全谱仪采用了全内置连续可调微波功率源、中阶梯光栅分光和紫外增强面阵CCD检测等多项先进技术,该仪器具有分辨率高、检测波长范围宽、灵敏度高、模块化等优点。对该仪器对26种元素检出限、光谱分辨率、多元素同时检测及实际样品测定等的考察表明其结果令人满意。     

Infrared facility at the Canadian light source

The Canadian Light Source (CLS) is constructing two beamlines for Infrared Spectroscopy using synchrotron radiation (IRSR). One will supply mid-Infrared (2–25 μ) light to a Fourier Transform Infrared (FTIR) spectrometer and microscope for biological applications. The second will have a high resolution FTIR spectrometer for gas-phase and surface spectroscopy in the far-Infrared (beyond 25 μ). The Infrared beamlines will use dipole bending magnet radiation from a special bend magnet port design which provides a 50 mrad square acceptance. Issues with the first mirror and photon mask design, as well as the beamline layout and features are discussed.     

Mössbauer backscattering spectrometer for mineralogical analysis of the mars surface

A Mössbauer spectrometer for the mineralogical analysis of the Mars surface is under development. This instrument will be installed on a Mars-Rover, included in the Soviet Union Mars-94/96 Mars mission. Due to power and mass restrictions the electromechanical drive and the electronic components have been extremely miniaturized in comparison to standard systems. Solid state detectors (PIN-diodes) are used for γ- and x-ray detection. The whole spectrometer is controlled by a microprocessor (transputer). An additional application as x-ray fluorescence spectrometer is proposed.     

Isochromat spectroscopy using SXAPS equipment

Any conventional soft x-ray appearance potential spectrometer may be converted to an isochromat spectrometer by placing an absorber foil of suitably chosen thickness in front of the x-ray detector. In the present work, we demonstrate the principle and work out in detail the properties of an aluminum absorption foil. Isochromats of a hafnium sample are compared to results obtained with a crystal x-ray spectrometer. Also, the equivalence of an isochromat and an SXAPS measurement at the same energy will be shown. The densities of unoccupied states as derived from the respective experiments are in pretty good agreement.     

Laser excess noise and interferometric effects in frequency-modulated diode-laser spectrometers

Tunable Diode-Laser Absorption Spectroscopy (TDLAS) is increasingly being used to measure trace-gas concentrations down to low part-per-billion levels (1 ppbv = 10^–9 volume mixing ratio). Semiconductor lead-salt diode lasers give access to the mid-infrared spectral region and the application of high-Frequency Modulation (FM) schemes can further improve the sensitivity and detection speed of modern instrumentation. Several factors influence or even limit spectrometer performance. The central elements in such spectrometers are lead-salt diode lasers. Experimental data will be presented, which demonstrate that high-frequency excess-noise contributions above several MHz can be attributed to mode hopping and mode partition noise during multimode laser operation. Additionally it will be discussed how a FM-TDLAS spectrometer can be interpreted as an optimized Michelson interferometer for absolute distance measurements and, therefore, is extremely sensitive towards drift effects. The higher the modulation frequency, the higher is the drift sensitivity of the spectrometer due to interferometric effects. These drift effects are a second factor affecting ultrasensitive measurements. While wideband-laser noise characteristics call for high modulation frequencies, the aforementioned interferometric effects in the spectrometer require low modulation frequencies.     

实时单发测量的汤姆逊离子谱仪

介绍一种使用闪烁体耦合电子倍增电荷耦合器件(EMCCD)的方式对离子进行记录的汤姆逊能谱仪,可实现对离子能谱的实时单发测量。同时,该谱仪利用倾斜电极板对离子进行偏转,可减少由于离子打在电极板上产生的电磁噪声,能够提高实验结果的信噪比。该谱仪在北京大学4.5 MV静电加速器和2×6MV串列加速器上进行了标定实验,测量了闪烁体将离子转化成光子后的探测效率,实验结果也验证了该谱仪的可行性和稳定性。该汤姆逊谱仪将用于北京大学激光加速器CLAPA对离子束流的测量研究。     

声光滤光器性能指标的计算和讨论

以可调谐声光滤光器为元件所制造的光谱分析仪,利用声光谱光器的电调谐分光作用,辅以计算机控制,以完成信息的实时处理,其中声光滤光器性能指标的好坏将直接影响光谱分析仪的设计制造本文对用不同切向的氧化碲晶体所制成几种声光滤光器的几项性能指标进行计算的讨论,使在设计制造光谱分析仪时对声光谱光器的声光和电性能先有一个总体认识,以减少不必要的实验和摸索。     

NEUTRON TIME OF FLIGHT ENERGY SPECTROMETER FOR ICF ION TEMPERATURE DIAGNOSTIC

A current-mode neutron time-of-flight(nTOF) energy spectrometer for inertial confinement fusion(ICF) ion temperature measurements has been designed which will reduce measuring error of fusion neutron energy spectra when the neutron yield is low. The spectrometer consists of a shallow cup-shaped ST1422 fast plastic scintillator with a thicknees of 3mm and full effective volume of 104cm³, a microchannel plate photomultiplier tube(MCP-PMT), a piece of coaxial cable(SUJ-50-7) with a length of 20m, and a transient oscilloscope with a bandwidth of 7GHz. The main performances of the spectrometer and its components have been calibrated. The rise-time and FWHM of the temporal response function are 260ps and 850 ps, respectively. This spectrometer will be used to measure ion temperature in the direct-driven implosion experiments on Sheng-Guang 2 laser facility at Shanghai Institute of Optics and Fine Mechanica(SIOFM) next year.     

兰州放射性束流线

兰州放射性束流线（RIBLL）是产生中能重离子放射性束流（RIB）的装置和高精度放射性束物理的实验谱仪．RIBLL的立体角接收度＞65msr、动量接收度达10％;RIBLL可提供极化RIB;RIBLL采用大接收度双消色差反对称结构,既可纯化放射性束,还可作为0°磁谱仪． Radioactive Ion Beam Line in Lanzhou (RIBLL) is a facility to produce intermediate energy radioactive ion beams (RIB), and also a high precision spectrometer for RIB physical experiments. The solid angle acceptance of RIBLL is 6. 5 msr. The momentum acceptance is about 10%. The polarized RIBs will be available. RIBLL is the equipment with double achromatic and asymmetric structure. So that it can not only sublimate the RIBs in pureness, but also operate as 0° magnet spectrometer.