检索结果-南通市图书馆

Radiative lifetime measurements of odd-parity highly-excited levels of Sn I by time-resolved laser spectroscopy

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2009年第9期18卷 3828-3832页

作者：徐嘉鑫凤艳艳孙桂娟戴振文 Department of Physics Jilin University Key Lab of Coherent Light Atomic and Molecular SpectroscopyMinistry of Education

Natural radiative lifetimes of five higher-lying odd-parity levels 5pTs ^3P1^0, 5p5d 1P1^0, 5p6d 3F2^0, 3D1^0 and 3F3^0 in neutral tin are measured by the time-resolved laser-induced fluorescence （TR-LIF） technique and the atomic beam method. All these lifetimes are not longer than 100 ns and they are found to be shorter than the lifetimes of evenparity levels in the same energy region. The results reported in this paper provide important transition parameters for highly-excited atomic Sn, which may be useful for theoretically calculating excited heavy atoms.

关键词： radiative lifetime atomic Sn highly-excited level laser spectroscopy

Cs 728 nm laser spectroscopy and Faraday Atomic Filter

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2014年第12期31卷 27-30页

作者：刘忠征陶智明蒋招杰陈景标 State Key Laboratory of Advanced Optical Communication System and Network Institute of Quantum Electronics School of Electronics Engineering ~ Computer Science Peking University Beijing 100871 College of Science Guizhou University of Engineering Science Bijie 551700

The laser spectroscopy of alkali-metal vapor is widely used in a number of applications, such as the Faraday anomalous dispersion optical fil- ter （FADOF）, the active optical clock, and wavelength ***＇ The Cs electrodeless dis- charge vapor lamp has rich spectra, including 455 nm, 459 nm, 728 nm, 852 nm, 1359 nm, and 1470 nm. The 852 nm laser pumping atoms from 6S1/2 to 6P3/2 have been used in *** 1359nm wave- length transited from 7S1/2 to 6P1/2 of Cs atoms can be used in the field of active optical clocks. The concept of active optical clocks has been proposed since 2005. Due to its good performance in sta- bility, the active optical clock has been extensively in- vestigated theoretically and experimentally in recent years, such as the two-level active optical clock, and three-level active optical clock. When considering the performance of the active optical clock, we hope to reduce the second-order Doppler shift in thermal atomic beam and the light shift induced by the pump- ing laser. To solve this issue, our group has recently proposed a four-level active optical clock, such as K 1252.2nm, Cs 1469nm, Rb 1366.9nm and Rb 728 nm. Moreover, the Rb 728 nm four-level quantum system has potentially a better performance than three long wavelength ones of Rb.

关键词： laser spectroscopy Faraday Atomic Filter electrodeless discharge

Ultrafast laser system based on noncollinear optical parametric amplification for laser spectroscopy

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Optics Letters 2015年第12期13卷 32-35页

作者：韩冬佳李妍妍杜鹃王坤李永舫 Tomohiro Miyatake Hitoshi Tamiaki Takayoshi Kobayashi 冷雨欣 State Key Laboratory of High Field laser Physics Shanghai Institute of Optics and Fine MechanicsChinese Academy of Sciences Laboratory of Advanced Optoelectronic Materials College of ChemistryChemical Engineering and Materials ScienceSoochow University Department of Materials Chemistry Ryukoku University Department of Bioscience and Biotechnology Ritsumeikan University Advanced Ultrafast laser Research Center University of Electro-Communications FSA Collaborative Innovation Center Shanghai Jiao Tong University

We report the experimental demonstration of transform-limited sub-6 fs pulses at an optimal central wavelength by a tunable noncollinear optical parametric amplification（NOPA） source. Meanwhile, a white light continuum in the near-infrared（NIR） range from 900 to 1100 nm is also successfully generated by focusing the unconverted800 nm beam during NOPA generation on a sapphire rod. Both visible-pump/visible-probe and visible-pump/NIR-probe experiments are realized using the same laser system. As examples, ultrafast photo-induced exciton dynamics inside two kinds of materials are investigated by the visible-pump/visible-probe and visible-pump/NIR-probe spectroscopy, respectively.

关键词： Band structure Infrared devices laser spectroscopy Pumping (laser) Sapphire Ultrafast lasers

Correction and analysis of lead content in soil by laser-induced breakdown spectroscopy

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2009年第6期7卷 545-548页

作者：谢承利陆继东李鹏艳李捷林兆祥 State Key Laboratory of Coal Combustion Huazhong University of Science and Technology College of Electrics and Information Engineering South-Central University for Nationalities

The laser-induced breakdown spectroscopy is used to analyze the lead content in soils. The analyzed spectral line profile is fitted by Lorentzian function for determining the background and the full-width at half-maximum （FWHM） intensity of spectral line. A self-absorption correction model based on the information of spectral broadening is introduced to calculate the true value of spectral line intensity, which refers to the elemental concentration. The results show that the background intensity obtained by spectral profile fitting is very effective and important due to removing the interference of spectral broadening, and a better precision of calibration analysis is acquired by correcting the self-absorption effect.

关键词： Absorption laser damage laser spectroscopy Particle size Soils

laser frequency stabilization based on Sagnac interferometric spectroscopy

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2008年第4期6卷 307-309页

作者：颜辉杨国卿王谨詹明生 State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and Mathematics Chinese Academy of SciencesWuhan 430071 2 Center for Cold Atom PhysicsChinese Academy of SciencesWuhan 430071 3 Graduate University of Chinese Academy of SciencesBeijing 100049 State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and Mathematics Chinese Academy of SciencesWuhan 430071 2 Center for Cold Atom PhysicsChinese Academy of SciencesWuhan 430071

A simple method based on Sagnac interferometric spectroscopy （SIS） is applied for frequency stabilization of diode lasers. Sagnac interferometric spectra of rubidium vapor are investigated both theoretically and experimentally. The interference signal at the output of the Sagnac interferometer displays a sharp dispersion feature near the atomic resonance. This dispersion curve is used as the feedback error signal to stabilize the laser frequeucy. Linewidth of a diode laser is stabilized down to 1 MHz by this modulation-free method.

关键词： laser spectroscopy Linewidth

Determination of Gum Arabic (<i>Acacia nilotica</i>) Constituents Using laser Induced Breakdown spectroscopy

在线全文

学校读者我要写书评

暂无评论

Natural Science 2021年第3期13卷 91-102页

作者： Mashair Ahmed Mohammed Yousif Nafie A. Almuslet Elfatih A. Hassan Fatima Medany Mohamed Taha Mohammed Idriss Ahmed Mohammed Abeer Eltaybe Fagir Osman College of Science in Alkhurma Taif University Alkhurma Saudi Arabia Almogran College of Science and Technology Khartoum Sudan Sudan University of Science and Technology Khartoum Sudan College of Science University of Khartoum Khartoum Sudan College of Education Qassim University Osman KSA

In this work, laser Induced Breakdown spectroscopy (LIBS) was used to determine the constituent of Gum Arabic (Acacia nilotica) collected from five different locations in Sudan. Gum samples were irradiated with 80 mJ pulse energy of Nd-YAG laser (1064 nm) and Atomic spectra Database was used for the spectral analysis of the plasma emitted from these samples. It was found that the samples contain the elements C, O, H, S, N, P, Na, Mg, Ca, Fe, Cr, Mn, Co with different amounts. Some elements like (Ti, Br, Ar, Th, Kr, Sc and Pr) are recorded here for the first time.

关键词： Gum Arabic LIBS laser spectroscopy Gum Investigation

High-Resolution Stark spectroscopy of Ba Highly-Excited States by Diode laser Technique

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Optics and Photonics Journal 2016年第8期6卷 37-40页

作者： Cheng Li Hiroumi Ito Masayuki Kawamura Tatsuya Minowa Weiguo Jin Department of Physics Faculty of Science Toho University Chiba Japan

High-resolution atomic-beam laser spectroscopy has been performed to study Stark effect of Ba atom. Stark spectra have been observed at various electric fields for Ba highly excited states. The scalar polarizability of the transition from 6s5d3D2 to 5d6p3F3 at 728.0 nm and the tensor polarizability of the 3F3 level have been determined for the first time, to be αs = -89.8 (12) kHz/(kV/cm)2 and αt = -133.7 (20) kHz/(kV/cm)2, respectively.

关键词： Stark Effect Scalar and Tensor Polarizabilities Ba Atom 6s5d3D2 - 5d6p3f3 Transition High Resolution laser spectroscopy

laser induced fluorescence diagnostic for velocity distribution functions:applications,physics,methods and developments

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Plasma Science and Technology 2021年第5期23卷 75-95页

作者： Chi-Shung YIP Di JIANG Institute of Plasma Physics Hefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031People's Republic of China

With more than 30 years of development,laser-induced fluorescence(LIF)is becoming an increasingly common diagnostic to measure ion and neutral velocity distribution functions in different fields of studies in plasma science including Hall thrusters,linear devices,plasma processing,and basic plasma physical *** this paper,technical methods used in the LIF diagnostic,including modulation,collection optics,and wavelength calibration techniques are reviewed in detail.A few basic physical processes along with applications and future development associated with the LIF diagnostics are also reviewed.

关键词： plasma diagnostics laser induced fluorescence laser spectroscopy

Temperature and number evolution of cold cesium atoms inside a wall-coated glass cell

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2015年第11期24卷 43-48页

作者：黄家强张建伟王时光王正博王力军 Department of Physics Tsinghua University Joint Institute for Measurement Science (JMI) Tsinghua University Department of Precision Instruments Tsinghua University

We report an experimental study on the temperature and number evolution of cold cesium atoms diffusively cooled inside a wall-coated glass cell by measuring the absorption profile of the 62S1/2 （F = 4） →62P3/2（F= 5） transition line with a weak probe laser in the evolution process. We found that the temperature of the cold atoms first gradually decreases from 16 mK to 9 mK, and then rapidly increases. The number of cold atoms first declines slowly from 2.1 × 109 to 3.7×108 and then falls drastically. A theoretical model for the number evolution is built and includes the instantaneous temperature of the cold atoms and a fraction p, which represents the part of cold cesium atoms elastically reflected by the coated cell wall. The theory is overall in good agreement with the experimental result, and a nonzero value is obtained for the fraction p, which indicates that the cold cesium atoms are not all heated to the ambient temperature by a single collision with the coated cell wall. These results can provide helpful insight for precision measurements based on diffuse laser cooling.

关键词： diffuse laser cooling laser spectroscopy atomic collision