中国科学院机构知识库网格系统: 检索

Quasi-three-level Nd:GdYNbO4 927 nm laser under 879 nm laser diode pumping 期刊论文 OAI收割
LASER PHYSICS, 2018, 卷号: 28, 期号: 8, 页码: 5
作者: Yan, Renpeng; Zhao, Chuang; Li, Xudong; Li, Kang; Yu, Xin

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laser diode (LD) pumped quasi-three-level direct pumping Nd:GdYNbO4

Laser cleaning of neutral attenuator plate based on low power laser diode (EI CONFERENCE) 会议论文 OAI收割
2nd International Conference on Energy, Environment and Sustainable Development, EESD 2012, October 12, 2012 - October 14, 2012, Jilin, China
作者: Chen Y.; Li L.

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Laser cleaning is a non-contact green and environmental cleaning method which can effectively remove particulate contaminations of sizes as small as 0.1 m without damage to the optics. But most laser cleaning devices are large and heavy also expensive due to using large lasers such as CO2 laser YAG Laser etc. In this work a low power LD was tried to clean fingerprint and dust contaminated on the surface of the attenuator glasses plates. In the laser cleaning experiment with low power diode the fingerprint grease can be efficient to be cleaned but there is no evident effect for cleaning inorganic dust. The cleaning different degree of fingerprint contaminations was investigated at the variable laser parameters including laser power and irradiation time. An optical microscope was used to analyze the cleaning effect. The results show that low power LD can effectively remove the fingerprint on the surface of absorptive-type attenuator glass plates. On the premise that the attenuator optics glasses are not damaged the cleaning area increases with the increase of radiation time and laser power. The cleaning area doesn't change much with the variation of laser frequency when the other parameters are the same. (2013) Trans Tech Publications Switzerland.

Continuously wavelength-tunable laser source using a self-injected fabry-perot laser diode 期刊论文 iSwitch采集
Ieee photonics technology letters, 2011, 卷号: 23, 期号: 6, 页码: 332-334
作者: Wu, Hao; Zhu, Ning Hua; Man, Jiang Wei; Yuan, Hai Qing

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Fabry-perot laser diode (fp-ld) Self-injection Wavelength-division-multiplexed (wdm) system

Analysis of laser jamming to satellite-based detector (EI CONFERENCE) 会议论文 OAI收割
International Symposium on Photoelectronic Detection and Imaging 2009: Laser Sensing and Imaging, June 17, 2009 - June 19, 2009, Beijing, China
作者: Guo L.-H.; Guo R.-H.; Wang S.-W.

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The reconnaissance satellite communication satellite and navigation satellite used in the military applications have played more and more important role in the advanced technique wars and already become the significant support and aid system for military actions. With the development of all kinds of satellites anti-satellite laser weapons emerge as the times require. The experiments and analyses of laser disturbing CCD (charge coupled detector) in near ground have been studied by many research groups but their results are not suitable to the case that using laser disturbs the satellite-based detector. Because the distance between the satellite-based detector and the ground is very large it is difficult to damage it directly. However the optical receive system of satellite detector has large optical gain so laser disturbing satellite detector is possible. In order to determine its feasibility the theoretical analyses and experimental study are carried out in the paper. Firstly the influence factors of laser disturbing satellite detector are analyzed in detail which including laser power density on the surface of the detector after long distance transmission and laser power density threshold for disturbing etc. These factors are not only induced by the satellite orbit but dependence on the following parameters: laser average power in the ground laser beam quality tracing and aiming precision and atmospheric transmission. A calculation model is developed by considering all factors which then the power density entering into the detector can be calculated. Secondly the laser disturbing experiment is performed by using LD (laser diode) with the wavelength 808 nm disturbing CCD 5 kilometer away which the disturbing threshold value is obtained as 3.5510-4mW/cm2 that coincides with other researcher's results. Finally using the theoretical model the energy density of laser on the photosensitive surface of MSTI-3 satellite detector is estimated as about 100mW/cm2 which is largely exceed the disturbing threshold and therefore verify the feasibility of using this kind of laser disturbing the satellite-based detector. According to the results. using the similar laser power density absolutely saturate the requirements to laser disturbing satellite-based detector. If considering the peak power of pulsed laser even decrease laser average power it is also possible to damage the detector. This result will provide the reliable evidences to evaluate the effect of laser disturbing satellite-based detector. 2009 SPIE.

High power diode laser with beam coupling (EI CONFERENCE) 会议论文 OAI收割
Optoelectronic Materials and Devices III, October 27, 2008 - October 30, 2008, Hangzhou, China
作者: Wang L.; Liu Y.; Wang L.; Liu Y.; Liu Y.

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As the increasing applications of the semiconductor lasers in the laser processing the single 2-D stack optic-power density has not satisfied the actual requirements. It demands to couple several diode laser stack beams to one to improve the brightness and it becomes the central issue to adopt the appropriate beam coupling technology which would offer high quality and high efficiency. In this paper it mainly introduces the beam shaping and the technology of spatial coupling polarization coupling and wavelength coupling. The coupling key elements are presented and indicated. Finally the development of the diode laser on beam coupling in our country fell behind through analyzing the statement of the world. Our lab is studying on polarization coupling and wavelength coupling. We gain some results by phase which the polarization coupling efficiency can achieve 90% for two LD stacks with seven bars whose luminous wavelength is 975nm and980nm.By two 808nm diode laser coupling the efficiency of 60% can be achieved after focusing to the beam size of 22mm2. 2008 SPIE.

Analysis of spectrum narrowing of diode laser bar (EI CONFERENCE) 会议论文 OAI收割
Semiconductor Lasers and Applications III, November 12, 2007 - November 13, 2007, Beijing, China
作者: Liu Y.; Wang L.; Wang L.; Wang L.; Liu Y.

收藏 | 浏览/下载：18/0 | 提交时间：2013/03/25

Laser diode bar (LDB) are used increasingly often for many applications but spectral bandwidth of LDB are generally approximately 2-4nm far too wide for many demanding applications e.g. spin-exchange optical pumping terahertz generation and lidar. External-cavity feedback can improve the spectral properties of LD or LDB. However spectrum narrowing of LDB is more difficult than that of LD. Bar curvature (i.e. "smile") produced in the manufacturing process affects the spectrum narrowing greatly. By geometrical optics approach and ORIGIN software smile which can be corrected by plano-convex cylindrical lens is simulated and the result is in good agreement with experiment. The selection of grating which is also a critical factor of spectrum narrowing will be stated. Finally an external cavity consisting of fast axis collimator two plano-convex cylindrical lens and a diffraction grating is used. The scheme is implemented on a 19-element LDB and yields 3-fold reduction in spectral linewidth under the situation that all optical elements in the system which are not optimized. Further we use a slit in the experiment and analyze the spectrum narrowing of each element in LDB.

高稳定激光二极管抽运Nd∶YLF再生放大器 期刊论文 OAI收割
中国激光, 2008, 卷号: 35, 期号: 2, 页码: 187, 190
王江峰; 朱海东; 李学春; 朱健强

收藏 | 浏览/下载：1292/282 | 提交时间：2009/09/18

激光技术 Laser diode (LD) pumping 再生放大 Laser technique 多程放大 Multipass amplification 激光二极管抽运 Regenerative amplification

导模法生长晶体研究进展 期刊论文 OAI收割
硅酸盐学报, 2008, 卷号: 36, 期号: s1, 页码: 222, 227
杨新波; 李红军; 徐军; 程艳; 唐慧丽; 周国清

收藏 | 浏览/下载：1002/124 | 提交时间：2009/09/24

Edge-defined film-fed crystal growth method (EFG) Laser diode (LD) Silicon crystal

Efficient excitations of radially and azimuthally polarized Nd ³⁺:YAG ceramic microchip laser by use of subwavelength multilayer concentric gratings composed of Nb2O5/SiO2 期刊论文 OAI收割
opt. express, 2008, 卷号: 16, 期号: 14, 页码: 10841, 10848
Li Jian-Lang; Ueda Ken-Ichi; Zhong Lan-Xiang; Musha Mitsuru; Shirakawa Akira; Sato Takashi

收藏 | 浏览/下载：1305/222 | 提交时间：2009/09/18

Axisymmetric Cylindrical vector beams Grating mirrors Laser diode (LD) Microchip lasers Multilayer gratings Nd:YAG ceramics Output couplers Sub wavelength Two types

Electroabsorption-modulated dfb laser integrated.with dual-core spot-size converters 期刊论文 iSwitch采集
Journal of lightwave technology, 2007, 卷号: 25, 期号: 8, 页码: 2213-2218
作者: Hou, Lianping; Ren, Zhong; Yu, Siyuan; Zhu, Hongliang; Wang, Wei

收藏 | 浏览/下载：32/0 | 提交时间：2019/05/12

Distributed feedback laser diode (dfb ld) Dual-core technology Electroabsorption modulator (eam) Quantum-well intermixing (qwi) Selective area growth (sag) Spot-size converters (sscs)