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Effects of pulse width and repetition rate of pulsed laser on kinetics and production of singlet oxygen luminescence

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Journal of Innovative Optical Health Sciences 2016年第6期9卷 26-34页

作者： Defu Chen Ying Wang Buhong Li Huiyun lin xuechun lin Ying Gu School of Information and Electronics Beijing Institute of Technology Beijing 100081P.R.China Department of Laser Medicine Chinese People's Liberation Army General Hospital Beijing 100853 P.R.China Key Laboratory of OptoElectronic Science and Technology for Medicine of Ministry of Education Fujian Normal University Fujian 350007P.R.China Fujian Provincial Key Laboratory for Photonics Technology Fujian Normal University Fujian 350007P.R.China Laboratory of All-Solid-State Light Sources Institute of Semiconductors Chinese Academy of Sciences Beijing 100083P.R.China

Pulsed and continuous-wave(CW)lasers have been widely used as the light sources for photodynamic therapy(PDT)*** oxygen(^(1)O_(2))is known to be a major cytotoxic agent in type-II PDT and can be directly detected by its near-infrared luminescence at 1270 *** compared to CW laser excitation,the effiects of pulse width and repetition rate of pulsed laser on the kinetics and production of^(1)O_(2)luminescence were quantitatively studied during photosensitization of Rose *** di®erence in kinetics of^(1)O_(2)luminescence was found under the excitation with various pulse widths of nanosecond,microsecond and CW irradiation with power of *** peak intensity and duration of^(1)O_(2)production varied with the pulse widths for pulsed laser excitation,while the^(1)O_(2)was generated continuously and its production reached a steady state with CW ***,no significant di®erence(P>0:05)in integral^(1)O_(2)production was *** results suggest that the PDT efficacy using pulsed laser may be identical to the CW laser with the same wavelength and the same average°uence rate below a threshold in solution.

关键词： Photodynamic therapy pulsed laser continuous-wave laser singlet oxygen luminescence

1.2 kW all-fiber narrow-linewidth picosecond MOPA system

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High Power Laser Science and Engineering 2023年第2期11卷 52-58页

作者： Jiexi Zuo Haijuan Yu Shuzhen Zou Zhiyong Dong Chaojian He Shuang Xu Chaoyu Ning xuechun Chen Xinyao Li xuechun lin Laboratory of All-Solid-State Light Sources Institute of SemiconductorsChinese Academy of SciencesBeijingChina Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijingChina College of Materials Science and Opto-Electronic Technology University of Chinese Academy of SciencesBeijingChina Beijing Engineering Technology Research Center of All-Solid-State Lasers Advanced Manufacturing BeijingChina

Achieving an all-fiber ultra-fast system with above kW average power and mJ pulse energy is extremely *** paper demonstrated a picosecond monolithic master oscillator power amplifier system at a 25 MHz repetition frequency with an average power of approximately 1.2 kW,a pulse energy of approximately 48μJ and a peak power of approximately 0.45 *** nonlinear effects were suppressed by adopting a dispersion stretched seed pulse(with a narrow linewidth of 0.052 nm)and a multi-mode master amplifier with an extra-large mode area;then an ultimate narrow bandwidth of 1.32 nm and a moderately broadened pulse of approximately 107 ps were ***,the great spatio-temporal stability was verified experimentally,and no sign of transverse mode instability appeared even at the maximum output *** system has shown great power and energy capability with a sacrificed beam propagation product of 5.28 mm·*** addition,further scaling of the peak power and pulse energy can be achieved by employing a lower repetition and a conventional compressor.

关键词： fiber laser nonlinear optics picosecond pulse transverse mode instability

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半导体激光器相干合束技术(特邀)

激光与光电子学进展 2024年第1期61卷 244-255页

作者：张超林学春赵鹏飞董智勇汪楠杨盈莹于海娟中国科学院半导体研究所全固态光源实验室北京100083 中国科学院大学材料科学与光电技术学院北京101407

大功率高光束质量半导体激光器在激光加工、激光通信、科学研究等方面有着广泛的应用,提高半导体激光器的功率和光束质量一直都是国际的研究前沿和学科热点。合束技术是提高半导体激光器输出功率最简单有效的方法。非相干合束技术提高... 详细信息

大功率高光束质量半导体激光器在激光加工、激光通信、科学研究等方面有着广泛的应用,提高半导体激光器的功率和光束质量一直都是国际的研究前沿和学科热点。合束技术是提高半导体激光器输出功率最简单有效的方法。非相干合束技术提高输出功率往往以损失空间、偏振或光谱特性为代价,在对光束特性要求不高的场合应用较为成熟。相干合束技术在提高半导体激光器输出功率的同时还能提高光束质量、压窄频谱宽度,是高亮度窄线宽半导体激光技术发展的重要方向。本文简述了相干合束技术的原理及要求,从锁相技术出发,综述了半导体激光器相干合束技术近年来的发展现状,总结了主动锁相和被动锁相的优缺点,主动锁相技术采用主振荡放大结构通过相位负反馈技术实现锁相,在合束单元数量上具有优势,能获得大功率相干输出,但结构较为复杂。被动锁相技术结构简单,一般通过外腔的衍射效应或者共腔技术实现单元间的相位锁定,具备自组织锁相特点,但不易获得高功率输出。最后对半导体激光器相干合束技术的未来发展进行了展望。

关键词：相干合束半导体激光器锁相高光束质量高功率

Experimental investigation of the stimulated Raman scattering effect in high-power nanosecond superfluorescent fiber source

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High Power Laser Science and Engineering 2023年第6期11卷 229-238页

作者： Chaoyu Ning Shuzhen Zou Haijuan Yu Jiexi Zuo xuechun Chen Shuang Xu Shifei Han Xinyao Li Wenjuan Wu Chaojian He xuechun lin Laboratory of All-Solid-State Light Sources Institute of SemiconductorsChinese Academy of SciencesBeijingChina Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijingChina College of Materials Science and Opto-Electronic Technology University of Chinese Academy of SciencesBeijingChina Beijing Engineering Technology Research Center of All-Solid-State Lasers Advanced Manufacturing BeijingChina

In this work,we experimentally investigate the dependence of the stimulated Raman scattering(SRS)effect on the seed linewidth of a high-power nanosecond superfluorescent fiber source(ns-SFS).The results reveal that the SRS in the ns-SFS amplifier is significantly influenced by the full width at half maximum(FWHM)of the ns-SFS seed,and there is an optimal FWHM linewidth of 2 nm to achieve the lowest SRS in our *** first-order SRS power ratio increases rapidly when the seed’s linewidth deviates from the optimal FWHM *** power scaling the ns-SFS seed with the optimal FWHM linewidth,a narrowband all-fiberized ns-SFS amplifier is achieved with a maximum average power of 602 W,pulse energy of 24.1 mJ and corresponding peak power of 422.5 *** is the highest average power and pulse energy achieved for all-fiberized ns-SFS amplifiers to the best of our knowledge.

关键词： fiber amplifier high power nanosecond superfluorescent fiber source stimulated Raman scattering effect

The PNA wavetrain and the sea surface temperature in the Northern Pacific

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Acta Oceanologica Sinica 1990年第4期9卷 527-538页

作者： lin xuechun Institute of Synoptic and Dynamic Meteorology, Academy of Meteorological Science, SMA, Beijing, China Inst. of Synoptic & Dynamic Meteorology Academy of Meteorological Science SMA Beijing China.

In this paper, the response of the atmospheric 3-5 year cycle to Northern Pacific SST is discussed, The results are as follows:1. From the simultaneous temporal correlations between the Equatorial Eastern Pacific SST, the westerly dirft area's SST and the Northern Pacific SST at all gridpoints, we find that there are three correlative regions in the Northern Pacific SST field, they are the westerly drift area, the Equatorial Eastern Pacific and the Alaska Bay , and their structures are very similar to the PNA pattern in the atmosphere The difference PTI between the Equatorial Eastern Pacific SST anomaly and the westerly drift area's SST anomaly can indicate the change of the PNA pattern of the Northern Pacific SST anomaly. It can represent SST change of 65 % areas over the Northern Pacific and can keep watch on El Nino and un-El Nino.2. Simultaneous temporal correlative field between PTI and filtered 500hPa (there is 3-5 year cycle only ) of the Northern Hemisphere presents clear PNA structure. The responses of the filtered 500hPa to El Nino and to un-EI Nino produce +PNA and -PNA wavetrains respectively.3. According to the different positions of the sea-surface temperature rise (drop) ,El Nino (un-EI Nino )can be divided into two classes: east-pattern and middle-pattern. The responses of the filtered 500hPa to the east-pattern and to the middle-pattern will produce PNA and EAA wavetrain respectively. This indicates that the responses of the atmosphere to the stationary heat sources in diffrent areas will produce wavetrains in diffrent track.

关键词： Nino EI The PNA wavetrain and the sea surface temperature in the Northern Pacific SST PNA

Interannual variation of East Asian summer monsoon and its impacts on general circulation and precipitation

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Journal of Geographical Sciences 2009年第1期19卷 67-80页

作者：于淑秋施晓晖林学椿 State Key Laboratory of Severe Weather Chinese Academy of Meteorological Sciences National Climate Center China Meteorological Administration

Using NCEP/NCAR reanalysis geopotential height （GHT） and wind at 850 hPa, GHT at 500 hPa, precipitation rate, sea level pressure （SLP） and precipitation observations from more than 600 stations nationwide in June-August from 1951 to 2006, and focusing on the East Asia-West Pacific region （10°-80°N, 70°-180°E）, interannual variation of East Asian summer monsoon （EASM） and its correlations with general circulation and precipitation patterns are studied by using statistical diagnostic methods such as 9-point high pass filtering, empirical orthogonal function （EOF） analysis, composite analysis and other statistical diagnosis, etc. It is concluded as follows：（1） EOF analysis of SLP in the East Asia-West Pacific region shows the existence of the zonal dipole oscillation mode （APD） between the Mongolia depression and the West Pacific high, and APD index can be used as an intensity index of EASM. （2） EOF analysis of GHT anomalies at 500 hPa in the East Asia-West Pacific region shows that the first EOF mode is characterized with an obvious meridional East Asian pattern （EAP）, and EAP index can also be used as an EASM intensity index. （3） The composite analysis of high/low APD index years reveals the close correlation of APD index with EAP at 500 hPa （or 850 hPa）. The study shows an obvious opposite correlation exists between APD index and EAP index with a correlation coefficient of -0.23, which passes the confidence test at 0.10 level. （4） Both APD and EAP indexes are closely correlated with precipitation during flood-prone season in China and precipitation rate over the East Asia-West Pacific region. The significant correlation area at 5% confidence level is mainly located from the southern area of the Yangtze River valley to the ocean around southern Japan, and the former is a positive correlation and the latter is a negative one.

关键词： summer monsoon East Asia-West Pacific dipole East Asian Pattern precipitation

论生态文明政策和制度的改革与完善——基于第一批中央环境保护督察及地方整改案例的分析

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社会主义研究 2017年第4期 80-87页

作者：蔺雪春山东工商学院公共管理学院

改革与完善生态文明政策和制度,要在深入研究相关政策制度的作用机制、实施效果等问题的基础上发掘思路。理论层面可从政策创新扩散、制度构建扩散、组织结构、联结过程四个维度构建分析框架,系统阐释生态文明政策与制度的类型学和运行... 详细信息

改革与完善生态文明政策和制度,要在深入研究相关政策制度的作用机制、实施效果等问题的基础上发掘思路。理论层面可从政策创新扩散、制度构建扩散、组织结构、联结过程四个维度构建分析框架,系统阐释生态文明政策与制度的类型学和运行逻辑。实践层面可基于第一批中央环境保护督察及地方整改的典型案例进行剖析审视。研究认为,增强生态文明政策的相对优势性,有机统一绩效责任、政治责任、法律责任于契约型制度中,理清环境治理任务和经济建设中心任务的关系条件,严格规范环境治理领域的府际关系和政企关系,从而强化生态文明政策与制度的可实施性和实施有效性,是未来改革完善生态文明政策和制度的重要选项。

关键词：生态文明改革政策制度

区域公共管理体制的新构想:面向主体功能区划

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中国行政管理 2014年第1期 88-92页

作者：蔺雪春山东工商学院公共管理学院中共中央编译局在站博士后烟台264005

我国区域公共管理亟待加强。与经济区域不同,国家一系列主体功能区划出台,对区域公共管理体制建设提出新要求。根据美、德、日等发达国家功能区公共治理经验和主体功能区划核心理念,分析我国区域公共管理存在的主要问题,提出健全区域事... 详细信息

我国区域公共管理亟待加强。与经济区域不同,国家一系列主体功能区划出台,对区域公共管理体制建设提出新要求。根据美、德、日等发达国家功能区公共治理经验和主体功能区划核心理念,分析我国区域公共管理存在的主要问题,提出健全区域事务核心动力机制、区域公共监管体系、区域服务体系、区域民主监督体系、区域公共治理工具库和数据库,改进区域激励体系等构想,促进面向主体功能区划的区域公共管理体制创新,科学统筹区域开发保护进程。

关键词：区域公共管理体制创新主体功能区划

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对东亚“安全复合体”观点的多重审视

世界经济与政治论坛 2006年第1期 97-100页

作者：蔺雪春山东大学政治学与公共管理学院

依据“安全复合体理论”的概念体系,有学者认为东亚已经成为一个相对独立的“安全复合体”。但本文认为,无论是从概念视角,或从战略与文化的不同视角分析,东亚“安全复合体”观点的某些考虑欠妥。我们需要认识到,推进东亚地区的协调与合... 详细信息

依据“安全复合体理论”的概念体系,有学者认为东亚已经成为一个相对独立的“安全复合体”。但本文认为,无论是从概念视角,或从战略与文化的不同视角分析,东亚“安全复合体”观点的某些考虑欠妥。我们需要认识到,推进东亚地区的协调与合作,决不能仅凭激情和理想,更要认清并基于本地区潜在的冲突因素或显在的矛盾事实。

关键词：安全研究东亚安全复合体东亚文化多样性