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Ultraviolet laser ionization studies of 1-fluoronaphthalene clusters and density functional theory calculations
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作者 张树东 张海芳 曾文碧 《Chinese Physics B》 SCIE EI CAS CSCD 2010年第12期223-227,共5页
This paper studies supersonic jet-cooled 1-fluoronaphthalene (1FN) clusters by ultraviolet (UV) laser ionization at 281 nm in a time-of-flight mass spectrometer. The (1FN)+ (n=1-3) series cluster ions are obs... This paper studies supersonic jet-cooled 1-fluoronaphthalene (1FN) clusters by ultraviolet (UV) laser ionization at 281 nm in a time-of-flight mass spectrometer. The (1FN)+ (n=1-3) series cluster ions are observed where the signal intensity decreases with increasing cluster size. The effects of sample inlet pressures and ionization laser fluxes to mass spectral distribution are measured. Using density functional theory calculations, it obtains a planar geometric structure of 1FN dimer which is combined through two hydrogen bonds. The mass spectra indicate that the intensity of 1FN trimer is much weaker than that of 1FN dimer and this feature is attributed to the fact that the dimer may form the first "shell" in geometric structure while the larger clusters are generated based on this fundamental unit. 展开更多
关键词 1-fluoronaphthalene clusters ultraviolet laser ionization mass spectrum density functional theory calculation
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Ionization and Dissociation of Benzene and Aniline under Deep Ultraviolet Laser Irradiation
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作者 Lijun Geng Hanyu Zhang +2 位作者 Haiming Wu Zhendong Sun Zhixun Luo 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2020年第5期583-589,I0014-I0028,I0078,I0079,共24页
We report a study on photo-ionization of benzene and aniline with incidental subsequent dissociation by the customized reflection time-of-flight mass spectrometer utilizing a deep ultraviolet 177.3 nm laser.Highly eff... We report a study on photo-ionization of benzene and aniline with incidental subsequent dissociation by the customized reflection time-of-flight mass spectrometer utilizing a deep ultraviolet 177.3 nm laser.Highly efficient ionization of benzene is observed with a weak C4H3+fragment formed by undergoing disproportional C-C bond dissociation.In comparison,a major C5H6+·fragment and a minor C6H6+·radical are produced in the ionization of aniline pertaining to the removal of CNH·and NH·radicals,respectively.First-principles calculation is employed to reveal the photo-dissociation pathways of these two molecules having a structural difference of just an amino group.It is demonstrated that hydrogen atom transfer plays an important role in the cleavage of C-C or C-N bonds in benzene and aniline ions.This study is helpful to understand the underlying mechanisms of chemical bond fracture of benzene ring and related aromatic molecules. 展开更多
关键词 PHOTO-DISSOCIATION Mass spectrometry BENZENE ANILINE Deep ultraviolet laser C-C bond activation
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Photoreflectance system based on vacuum ultraviolet laser at 177.3 nm
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作者 Wei-Xia Luo Xue-Lu Liu +5 位作者 Xiang-Dong Luo Feng Yang Shen-Jin Zhang Qin-Jun Peng Zu-Yan Xu Ping-Heng Tan 《Chinese Physics B》 SCIE EI CAS CSCD 2022年第11期100-105,共6页
Photoreflectance(PR)spectroscopy is a powerful and non-destructive experimental technique to explore interband transitions of semiconductors.In most PR systems,the photon energy of the pumping beam is usually chosen t... Photoreflectance(PR)spectroscopy is a powerful and non-destructive experimental technique to explore interband transitions of semiconductors.In most PR systems,the photon energy of the pumping beam is usually chosen to be higher than the bandgap energy of the sample.To the best of our knowledge,the highest energy of pumping laser in reported PR systems is 5.08 eV(244 nm),not yet in the vacuum ultraviolet(VUV)region.In this work,we report the design and construction of a PR system pumped by VUV laser of 7.0 eV(177.3 nm).At the same time,dual-modulated technique is applied and a dual channel lock-in-amplifier is integrated into the system for efficient PR measurement.The system’s performance is verified by the PR spectroscopy measurement of well-studied semiconductors,which testifies its ability to probe critical-point energies of the electronic band in semiconductors from ultraviolet to near-infrared spectral region. 展开更多
关键词 photoreflectance spectroscopy vacuum ultraviolet laser electronic band structure critical points of electron density of states
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Proton Acceleration Driven by High-Intensity Ultraviolet Laser Interaction with a Gold Foil 被引量:1
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作者 路建新 兰小飞 +4 位作者 王雷剑 席晓峰 黄永盛 汤秀章 王乃彦 《Plasma Science and Technology》 SCIE EI CAS CSCD 2013年第9期863-865,共3页
Proton acceleration induced by a high-intensity ultraviolet laser interaction with a thin foil target was studied on an ultra-short KrF laser amplifier called LLG50 in China Institute of Atomic Energy (CIAE). The ul... Proton acceleration induced by a high-intensity ultraviolet laser interaction with a thin foil target was studied on an ultra-short KrF laser amplifier called LLG50 in China Institute of Atomic Energy (CIAE). The ultraviolet laser produced pulses with a high-contrast of 109, duration of 500 fs and energy of 30 mJ. The p-polarized laser was focused on a 2.1 #m gold foil by an off-axis parabola mirror (OAP) at an incident angle of 45°. The laser intensity was 1.2× 1017 W/cm2. The divergence angle for proton energy of 265 keV or higher was 30°, which was recorded by a CR39 detector covered with 2 μm aluminum foil in the target normal direction. The maximum proton energy recorded by a CR39 detector covered with a 4 μm aluminum foil was 440 keV, and the proton energy spectrum was measured by a proton spectrometer. The ultraviolet laser acquires a relatively lower hot electron temperature, which can be ascribed to the proportional relationship of Iλ2, but a higher hot electron density because of the higher laser absorption and critical density. Higher electron density availed to strengthen the sheath electric field, and increased the proton acceleration. 展开更多
关键词 ultraviolet ultra-short laser PROTON thin foil target target normal sheathacceleration
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A picosecond widely tunable deep-ultraviolet laser for angle-resolved photoemission spectroscopy 被引量:1
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作者 张丰丰 杨峰 +8 位作者 张申金 徐志 王志敏 许凤良 彭钦军 张景园 王晓洋 陈创天 许祖彦 《Chinese Physics B》 SCIE EI CAS CSCD 2013年第6期410-412,共3页
We develop a picosecond widely tunable laser in a deep-ultraviolet region from 175 nm to 210 nm, generated by two stages of frequency doubling of a 80-MHz mode-locked picosecond Ti:sapphire laser. A β-BaB2O4 walk-of... We develop a picosecond widely tunable laser in a deep-ultraviolet region from 175 nm to 210 nm, generated by two stages of frequency doubling of a 80-MHz mode-locked picosecond Ti:sapphire laser. A β-BaB2O4 walk-off compensation configuration and a KBe2BO3F2 prism-coupled device are adopted for the generation of second harmonic and fourth harmonics, respectively. The highest power is 3.72 mW at 193 nm, and the fluctuation at 2.85 mW in 130 rain is less than ±2%. 展开更多
关键词 tunable laser deep ultraviolet walk-off compensation KBBF crystal
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Diode-pumped high-power continuous-wave intracavity frequency-doubled Pr^(3+):YLF ultraviolet lasers around 349 nm
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作者 Xiuji Lin Zheng Zhang +4 位作者 Shuaihao Ji Run Fang Bo Xiao Huiying Xu Zhiping Cai 《High Power Laser Science and Engineering》 SCIE CAS CSCD 2023年第1期44-51,共8页
High-power continuous-wave ultraviolet lasers are useful for many applications.As ultraviolet laser sources,the wavelength switching capability and compact structure are very important to extend the applicability and ... High-power continuous-wave ultraviolet lasers are useful for many applications.As ultraviolet laser sources,the wavelength switching capability and compact structure are very important to extend the applicability and improve the flexibility in practical applications.In this work,we present two simple and relatively compact schemes by laser diode pumping to obtain a watt-level single-wavelength 348.7-nm laser and discrete wavelength tunable ultraviolet lasers around 349 nm(from 334.7 to 364.5 nm)by intracavity frequency doubling based on Pr^(3+):YLF andβ-BBO crystals.The maximum output power of the single-wavelength 348.7-nm laser is 1.033 W.The output powers of the discrete wavelength tunable lasers are at the level of tens of milliwatts,except for two peaks at 348.7 and 360.3 nm with output powers of approximately 500 mW.In addition,simulations are carried out to explain the experimental results and clarify the tuning mechanisms. 展开更多
关键词 high-power ultraviolet laser Pr^(3+):YLF tunable ultraviolet laser
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Fabrication of room temperature continuous-wave operation GaN-based ultraviolet laser diodes 被引量:6
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作者 Degang Zhao Jing Yang +8 位作者 Zongshun Liu Ping Chen Jianjun Zhu Desheng Jiang Yongsheng Shi Hai Wang Lihong Duan Liqun Zhang Hui Yang 《Journal of Semiconductors》 EI CAS CSCD 2017年第5期1-3,共3页
Two kinds of continuous-wave GaN-based ultraviolet laser diodes(LDs) operated at room temperature and with different emission wavelengths are demonstrated.The LDs epitaxial layers are grown on GaN substrate by metal... Two kinds of continuous-wave GaN-based ultraviolet laser diodes(LDs) operated at room temperature and with different emission wavelengths are demonstrated.The LDs epitaxial layers are grown on GaN substrate by metalorganic chemical vapor deposition,with a 10 × 600 μm^2 ridge waveguide structure.The electrical and optical characteristics of the ultraviolet LDs are investigated under direct-current injection at room temperature.The stimulated emission peak wavelength of first LD is 392.9 nm,the threshold current density and voltage is 1.5kA/cm^2 and 5.0 V,respectively.The output light power is 80 mW under the 4.0 kA/cm^2 injection current density.The stimulated emission peak wavelength of second LD is 381.9 nm,the threshold current density the voltage is2.8 kA/cm^2 and 5.5 V,respectively.The output light power is 14 mW under a 4.0 kA/cm^2 injection current density. 展开更多
关键词 GaN-based ultraviolet laser diodes continuous-wave operation threshold current
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Ultraviolet laser photolysis of hydrocarbons for nondiamond carbon suppression in chemical vapor deposition of diamond films 被引量:3
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作者 Li-Sha Fan Loic Constantin +12 位作者 Da-wei Li Lei Liu Kamran Keramatnejad Clio Azina Xi Huang Hossein Rabiee Golgir Yao Lu Zahra Ahmadi Fei Wang Jeffrey Shield Bai Cui Jean-Francois Silvain Yong-Feng Lu 《Light(Science & Applications)》 SCIE EI CAS CSCD 2017年第1期36-44,共9页
In this work,we demonstrate that ultraviolet(UV)laser photolysis of hydrocarbon species alters the flame chemistry such that it promotes the diamond growth rate and film quality.Optical emission spectroscopy and laser... In this work,we demonstrate that ultraviolet(UV)laser photolysis of hydrocarbon species alters the flame chemistry such that it promotes the diamond growth rate and film quality.Optical emission spectroscopy and laser-induced fluorescence demonstrate that direct UV laser irradiation of a diamond-forming combustion flame produces a large amount of reactive species that play critical roles in diamond growth,thereby leading to enhanced diamond growth.The diamond growth rate is more than doubled,and diamond quality is improved by 4.2%.Investigation of the diamond nucleation process suggests that the diamond nucleation time is significantly shortened and nondiamond carbon accumulation is greatly suppressed with UV laser irradiation of the combustion flame in a laser-parallel-to-substrate geometry.A narrow amorphous carbon transition zone,averaging 4 nm in thickness,is identified at the film–substrate interface area using transmission electron microscopy,confirming the suppression effect of UV laser irradiation on nondiamond carbon formation.The discovery of the advantages of UV photochemistry in diamond growth is of great significance for vastly improving the synthesis of a broad range of technically important materials. 展开更多
关键词 combustion chemical vapor deposition DIAMOND PHOTOLYSIS ultraviolet laser
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In-situ generation and global property profiling of metal nanoclusters by ultraviolet laser dissociation-mass spectrometry 被引量:2
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作者 Zheyi Liu Zhaoxian Qin +11 位作者 Chaonan Cui Zhixun Luo Bing Yang You Jiang Can Lai Zhipeng Wang Xiaolei Wang Xiang Fang Gao Li Fangjun Wang Chunlei Xiao Xueming Yang 《Science China Chemistry》 SCIE EI CSCD 2022年第6期1196-1203,共8页
Metal nanoclusters are promising nanomaterials with unique properties, but only a few ones with specific numbers of metal atoms can be obtained and studied up to now. In this study, we establish a new paradigm of in-s... Metal nanoclusters are promising nanomaterials with unique properties, but only a few ones with specific numbers of metal atoms can be obtained and studied up to now. In this study, we establish a new paradigm of in-situ generation and global study of metal nanoclusters with different sizes, constitutions, and charge states, including both accurate constitution characterization and global activity profiling. The complex mixtures of metal nanoclusters are produced by employing single-pulsed 193-nm laser dissociation of monolayer-protected cluster(MPC) precursors within a high-resolution mass spectrometry(HRMS). More than400 types of bare gold nanoclusters including novel multiply charged(2+ and 3+), S-/P-doped, and silver alloy ones can be efficiently generated and accurately characterized. A distinct size(1 to 142 atoms)-and charge(1+ to 3+)-hierarchy reactivity is clearly observed for the first time. This global cluster study might greatly promote the developments and applications of novel metal nanoclusters. 展开更多
关键词 metal nanocluster ultraviolet laser dissociation mass spectrometry global property profiling size-and charge-hierarchy
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Advances in deep ultraviolet laser based high-resolution photoemission spectroscopy 被引量:2
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作者 Zu-yan XU Shen-jin ZHANG +10 位作者 Xing-jiang ZHOU Feng-feng ZHANG Feng YANG Zhi-min WANG Nan ZONG Guo-dong LIU Lin ZHAO Li YU Chuang-tian CHEN Xiao-yang WANG Qin-jun PENG 《Frontiers of Information Technology & Electronic Engineering》 SCIE EI CSCD 2019年第7期885-914,共30页
We briefly review recent results on photoemission spectroscopy based on the deep and vacuum ultraviolet diode pumped solid-state lasers which we have developed.Cascaded second harmonic generation with the nonlinear cr... We briefly review recent results on photoemission spectroscopy based on the deep and vacuum ultraviolet diode pumped solid-state lasers which we have developed.Cascaded second harmonic generation with the nonlinear crystal KBe2BO3F2(KBBF)is used to generate deep ultraviolet and vacuum ultraviolet laser radiation,which complements traditional incoherent light sources such as gas discharge lamps and synchrotron radiation,and has greatly improved resolution with respect to energy,momentum,and spin of photoemission spectroscopy.Many new functions have been developed with the advantages of high photon energy,narrow linewidth,high photon flux density,and so on.These have led to the observation of various new phenomena and the amassment of new data in the fields of high temperature superconductivity,topological electronics,Fermi semi-metals,and so forth.These laser systems have revived the field of photoemission spectroscopy and provided a new platform in this frontier research field. 展开更多
关键词 Deep and vacuum ultraviolet laser Second harmonic generation KBe2BO3F2 nonlinear crystal Photoelectron spectroscopy
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High-power ultraviolet 278-nm laser from fourth-harmonic generation of an Nd:YAG amplifier in CsB3O5 crystal
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作者 Miao He Feng Yang +10 位作者 Cheng Dong Zhi-Chao Wang Lei Yuan Yi-Ting Xu Guo-Chun Zhang Zhi-Min Wang Yong Bo Qin-Jun Peng Da-Fu Cui Yi-Cheng Wu Zu-Yan Xu 《Chinese Physics B》 SCIE EI CAS CSCD 2018年第5期265-269,共5页
We report on the experimental investigation and theoretical analysis of a nanosecond pulse high power ultraviolet(UV) 278 nm laser by fourth-harmonic generation(FHG) of a 1112-nm Nd:YAG amplifier in LiB3O5(LBO)... We report on the experimental investigation and theoretical analysis of a nanosecond pulse high power ultraviolet(UV) 278 nm laser by fourth-harmonic generation(FHG) of a 1112-nm Nd:YAG amplifier in LiB3O5(LBO) and CsB3O5(CBO) crystals. The UV laser delivers a maximum average power of 10.3 W at 278 nm with peak power of 36.8 k W under input pump power of 41 W at 556 nm. This is, to the best of our knowledge, the highest output power at the specific UV wavelength of 278 nm. We also performed the theoretical investigation on the FHG with a model in the Gaussian approximation of both spatial and temporal profiles, especially accounting for the two-photon absorption effect in CBO crystal for the first time. The average output power, pulse width, and beam spatial distribution of the UV laser were simulated. The theoretical calculations are in close agreement with the experimental results. 展开更多
关键词 ultraviolet lasers frequency doubled CsB3O5(CBO)crystal two-photon absorption
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Frequency stabilization of a 214.5-nm ultraviolet laser
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作者 王时光 张建伟 +4 位作者 王正博 王波 刘维新 赵研英 王力军 《Chinese Optics Letters》 SCIE EI CAS CSCD 2013年第3期32-34,共3页
An improved method for stabilizing a frequency-quadrupled 214.5-nm tunable diode laser system is re- ported. Improvements to the method include a homemade logic circuit and the use of a Fabry-Perot optical spectrum an... An improved method for stabilizing a frequency-quadrupled 214.5-nm tunable diode laser system is re- ported. Improvements to the method include a homemade logic circuit and the use of a Fabry-Perot optical spectrum analyzer as a transfer cavity. Lasers locked with this method exhibit megahertz-level frequency stability measured with an optical frequency comb referenced to a cesium atomic standard. The laser can be locked for hours to days, depending on experiment requirements. Being relatively inexpensive, stable, and robust, the control method can be applied to stabilizing essentially all lasers of deep ultraviolet wavelengths. 展开更多
关键词 Frequency stabilization of a 214.5-nm ultraviolet laser NM LENGTH
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Vacuum Ultraviolet Free-Electron Laser Photoionization Mass Spectrometry of Alpha-pinene Ozonolysis 被引量:1
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作者 Xiangyu Zang Zhaoyan Zhang +10 位作者 Chong Wang Tiantong Wang Huijun Zheng Hua Xie Jiayue Yang Dongxu Dai Guorong Wu Weiqing Zhang Gang Li Xueming Yang Ling Jiang 《Chinese Journal of Chemical Physics》 SCIE EI CAS CSCD 2022年第2期281-288,I0002,共9页
α-pinene is the most abundant monoterpene that represents an important family of volatile organic compounds.Molecular identification of key transient compounds during theα-pinene ozonolysis has been proven to be a c... α-pinene is the most abundant monoterpene that represents an important family of volatile organic compounds.Molecular identification of key transient compounds during theα-pinene ozonolysis has been proven to be a challenging experimental target because of a large number of intermediates and products involved.Here we exploit the recently developed hybrid instruments that integrate aerosol mass spectrometry with a vacuum ultraviolet free-electron laser to study theα-pinene ozonolysis.The experiments ofα-pinene ozonolysis are performed in an indoor smog chamber,with reactor having a volume of 2 m^(3) which is made of fluorinated ethylene propylene film.Distinct mass spectral peaks provide direct experimental signatures of previously unseen compounds produced from the reaction ofα-pinene with O_(3).With the aid of quantum chemical calculations,plausible mechanisms for the formation of these new compounds are proposed.These findings provide crucial information on fundamental understanding of the initial steps ofα-pinene oxidation and the subsequent processes of new particle formation. 展开更多
关键词 Vacuum ultraviolet free-electron laser PHOTOIONIZATION Mass spectrometry Volatile organic compound OZONOLYSIS
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High-performance frequency stabilization of ultraviolet diode lasers by using dichroic atomic vapor spectroscopy and transfer cavity 被引量:1
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作者 Danna Shen Liangyu Ding +4 位作者 Qiuxin Zhang Chenhao Zhu Yuxin Wang Wei Zhang Xiang Zhang 《Chinese Physics B》 SCIE EI CAS CSCD 2020年第7期356-362,共7页
We develop a high-performance ultraviolet(UV)frequency stabilization technique implemented directly on UV diode lasers by combining the dichroic atomic vapor laser lock and the resonant transfer cavity lock.As an exam... We develop a high-performance ultraviolet(UV)frequency stabilization technique implemented directly on UV diode lasers by combining the dichroic atomic vapor laser lock and the resonant transfer cavity lock.As an example,we demonstrate a stable locking with measured frequency standard deviations of approximately 200 kHz and 300 kHz for 399 nm and 370 nm diode lasers in 20 min.We achieve a long-term frequency drift of no more than 1 MHz for the target 370 nm laser within an hour,which is further verified with fluorescence count rates of a single trapped ^171Yb+ion.We also find strong linear correlations between lock points and environmental factors such as temperature and atmospheric pressure.Our approach provides a simple and stable solution at a relatively low cost,and features flexible control,high feedback bandwidth and minimal power consumption of the target UV laser. 展开更多
关键词 frequency stabilization ultraviolet diode laser dichroic atomic vapor spectroscopy transfer cavity
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Infrared Spectroscopy of Neutral Clusters Based on a Vacuum Ultraviolet Free Electron Laseri 被引量:1
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作者 Gang Li Chong Wang +4 位作者 Hui-jun Zheng Tian-tong Wang Hua Xie Xue-ming Yang Ling Jiang 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2021年第1期51-60,I0011,共11页
Spectroscopic characterization of clusters is crucial to understanding the structures and reaction mechanisms at the microscopic level,but it has been proven to be a grand challenge for neutral clusters because the ab... Spectroscopic characterization of clusters is crucial to understanding the structures and reaction mechanisms at the microscopic level,but it has been proven to be a grand challenge for neutral clusters because the absence of a charge makes it di伍cult for the size selection and detection.Infrared(IR)spectroscopy based on threshold photoionization using a tunable vacuum ultraviolet free electron laser(VUV-FEL)has recently been developed in the lab.The IR-VUV depletion and IR+VUV enhancement spectroscopic techniques open new avenues for size-selected IR spectroscopies of a large variety of neutral clusters without confinement(i.e.,an ultraviolet chromophore,a messenger tag,or a host matrix).The spectroscopic principles have been demonstrated by investigations of some neutral water clusters and some metal carbonyls.Here,the spectroscopic principles and their applications for neutral clusters are reviewed. 展开更多
关键词 CLUSTERS Infrared spectroscopy Vacuum ultraviolet free electron laser STRUCTURES Reaction mechanisms
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Spectral Efficiency of Extreme Ultraviolet Emission from CO_2 Laser-Produced Tin Plasma Using a Grazing Incidence Flat-Field Spectrograph
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作者 吴涛 王新兵 王少义 《Plasma Science and Technology》 SCIE EI CAS CSCD 2013年第5期435-438,共4页
A grazing incidence flat-field spectrograph using a concave grating was constructed to measure extreme ultraviolet (EUV) emission from a CO 2 laser-produced tin plasma throughout the wavelength region of 5 nm to 20 ... A grazing incidence flat-field spectrograph using a concave grating was constructed to measure extreme ultraviolet (EUV) emission from a CO 2 laser-produced tin plasma throughout the wavelength region of 5 nm to 20 nm for lithography. Spectral efficiency of the EUV emission around 13.5 nm from plate, cavity, and thin foil tin targets was studied. By translating the focusing lens along the laser axis, the dependence of EUV spectra on the amount of defocus was investigated. The results showed that the spectral efficiency was higher for the cavity target in comparison to the plate or foil target, while it decreased with an increase in the defocus distance. The source's spectra and the EUV emission intensity normalized to the incident pulse energy at 45 from the target normal were characterized for the in-band (2% of bandwidth) region as a function of laser energy spanning from 46 mJ to 600 mJ for the pure tin plate target. The energy normalized EUV emission was found to increase with the increasing incident pulse energy. It reached the optimum value for the laser energy of around 343 mJ, after which it dropped rapidly. 展开更多
关键词 laser-produced plasma extreme ultraviolet (EUV) emission CO2 laser spec-tral efficiency EUV lithography
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Effect of open ultraviolet germicidal irradiation lamps on functionality of excimer lasers used in cornea surgery
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作者 Jaroslavas Belovickis Aliaksei Kurylenka Vadim Murashko 《International Journal of Ophthalmology(English edition)》 SCIE CAS 2017年第9期1474-1476,共3页
We report on the impact of direct ultraviolet germicidal irradiation(UVGI)on reflective optics,used in the excimer laser system Allegretto Eye-Q.The aim of our work was to confirm our hypothesis based on long-rate o... We report on the impact of direct ultraviolet germicidal irradiation(UVGI)on reflective optics,used in the excimer laser system Allegretto Eye-Q.The aim of our work was to confirm our hypothesis based on long-rate observations of obtained anomalies in post-operative results that are attributed to degradation of reflective optics upon ultraviolet radiation.The presence of direct UVGI coupled with humidity in the operating environment caused merging anomalies and unwanted post-operative correction values.Ultraviolet-A radiation caused a similar effect on the reflective cover of the mirrors. 展开更多
关键词 ultraviolet radiation excimer lasers post-operative anomalies laser-assisted in situ keratomileusis mirror degradation
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Analysis of extreme ultraviolet spectral profiles of laser-produced Cr plasmas 被引量:1
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作者 L Wu M G Su +4 位作者 Q Min S Q Cao S Q He D X Sun C Z Dong 《Chinese Physics B》 SCIE EI CAS CSCD 2019年第7期319-323,共5页
Radiation from laser-produced plasmas was examined as a potential wavelength calibration source for spectrographs in the extreme ultraviolet(EUV) region.Specifically, the EUV emission of chromium(Cr) plasmas was acqui... Radiation from laser-produced plasmas was examined as a potential wavelength calibration source for spectrographs in the extreme ultraviolet(EUV) region.Specifically, the EUV emission of chromium(Cr) plasmas was acquired via spatiotemporally resolved emission spectroscopy.With the aid of Cowan and flexible atomic code(FAC) structure calculations,and a comparative analysis with the simulated spectra, emission peaks in the 6.5–15.0 nm range were identified as 3 p–4 d, 5 d and 3 p–4 s transition lines from Cr5+–Cr10+ions.A normalized Boltzmann distribution among the excited states and a steady-state collisional-radiative model were assumed for the spectral simulations, and used to estimate the electron temperature and density in the plasma.The results indicate that several relatively isolated emission lines of highly charged ions would be useful for EUV wavelength calibration. 展开更多
关键词 laser-produced PLASMAS highly CHARGED ions extreme ultraviolet WAVELENGTH calibration
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Growth of GaN Thin Film by Pulsed Laser Deposition and Its Application on Ultraviolet Detectors
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作者 Dadi Rusdiana Maman Budiman Mochamad Barmawi 《材料科学与工程(中英文A版)》 2011年第3X期336-341,共6页
关键词 GAN薄膜 脉冲激光沉积 紫外探测器 薄膜生长 应用 纤锌矿结构 载流子浓度 电子迁移率
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Feasibility study on optical vortex generation at Shanghai deep ultraviolet free-electron laser
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作者 邓海啸 《Nuclear Science and Techniques》 SCIE CAS CSCD 2014年第1期1-5,共5页
Coherent light with orbital angular momentum(OAM)is of great interest.Recently,OAM light generation by coupling a relativistic electron beam with a Gaussian mode laser pulse at the high harmonics of a helical undulato... Coherent light with orbital angular momentum(OAM)is of great interest.Recently,OAM light generation by coupling a relativistic electron beam with a Gaussian mode laser pulse at the high harmonics of a helical undulator has been demonstrated experimentally.In this paper,the possibility of delivering coherent OAM light at the 3^(rd)harmonic of the Gaussian mode seed laser is discussed for the Shanghai deep ultraviolet freeelectron laser(SDUV-FEL).Considerations are given on the experiment setup,the expected performance and the possible measurement method. 展开更多
关键词 自由电子激光 深紫外 涡流发生器 光学 上海 相对论电子束 高斯模式 轨道角动量
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