中国科学院机构知识库网格系统: 检索

Direct laser writing of symmetry-broken spiral tapers for polarization-insensitive three-dimensional plasmonic focusing 期刊论文 OAI收割
LASER & PHOTONICS REVIEWS, 2014, 卷号: 8, 期号: 4, 页码: 602
Li, JF; Mu, JJ; Wang, BL; Ding, W; Liu, J; Guo, HL; Li, WX; Gu, CZ; Li, ZY

收藏 | 浏览/下载：33/0 | 提交时间：2015/04/14

surface plasmon polaritons three-dimensional plasmonic focusing direct laser writing spiral conical tapers

KW-output high beam quality diode laser array source (EI CONFERENCE) 会议论文 OAI收割
2012 International Conference on Optoelectronics and Microelectronics, ICOM 2012, August 23, 2012 - August 25, 2012, Changchun, China
作者: Zhang J.; Wang L.; Wang L.; Wang L.; Liu Y.

收藏 | 浏览/下载：47/0 | 提交时间：2013/03/25

With the advantages of small volume light weight high efficiency and long lifespan diode laser has been widely applied to industrial processing. Presently for laser used as processing light source needs to amount to dozens of KW per cm2 of power density how to increase power output and get smaller light spot for diode laser becomes a key problem. It is introduced that by designing beam shaping by ourselves and making use of optical system for beam blooming and focusing 808nm laser array composed of 20 bars eventually achieves the 1001.5w power output coupling efficiency at 90% 11mm2 of light spot through experiments which enables diode laser to be directly applied to cladding welding and so on. 2012 IEEE.

Experimental generation of 58 MeV quasi-monoenergetic electron beam by ultra-intense femto-second laser wakefield 期刊论文 OAI收割
ACTA PHYSICA SINICA, 2010, 卷号: 59, 页码: 8733-8738
作者: Dong Ke-Gong; Gu Yu-Qiu; Zhu Bin; Wu Yu-Chi; Cao Lei-Feng

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收藏 | 浏览/下载：36/0 | 提交时间：2018/05/31

laser wakefield electron acceleration bubble self focusing

Far-field focusing of laser beam based on digital image processing techniques (EI CONFERENCE) 会议论文 OAI收割
Optoelectronic Imaging and Multimedia Technology, October 18, 2010 - October 20, 2010, Beijing, China
作者: Zhao S.; Tian Y.-Z.; Liu L.-S.; Guo J.; Zhang H.-Y.

收藏 | 浏览/下载：40/0 | 提交时间：2013/03/25

In order to lead the laser beam transmit in the atmosphere convergently an experiment of laser focus at the distance of 450m and 300m has been operated in the outdoor place. The actual manipulations are as follows: Firstly the laser was collimated by a beam expander then the near-parallel laser beam was transmitted with a Galileo telescope system and the distance between the concave lens and the convex lens can be tuned through a precise displacement platform so the focus of the system changed due to the tiny displacement of the concave lens. Secondly the average power of the laser spot can be measured using power meter the power is 47.67mW and the standard deviation is 0.67mW while the focal length is 450m. Thirdly the energy distribution was found through the laser beam analyzer. The spot images were saved using the beam analyzer then the saved image can be processed with Matlab software afterwards. The function named EDGE and Sobel operator was used in the pre-processing of the saved image then method of median filter was used in the course of image de-noising and 53H filter was adopted in the signal analysis. The diameter of laser spot was obtained by the method above the diameter is 5.56mm and the standard deviation is 0.24mm. The spot center excursion is 0.56mm it is 10.43% of the total diameter of the laser spot. At last the key factors of the energy dissipation in the focusing system can be summarized as follows: restriction of the diffraction limit attenuation in the atmosphere geometrical aberration of optical system and the diffraction limit and the geometrical aberration are significant in the three factors above so we can reduce the impact of the both factors during the design of optical system. The reliable referenced data of the system design can be acquired through the primary experiment research. 2010 SPIE.

Laser-driven inertial ion focusing 期刊论文 OAI收割
phys. rev. e, 2009, 卷号: 79, 期号: 1, 页码: 15401
Zhuo H. B.; Yu Wei; Yu M. Y.; Xu H.; Wang X.; 沈百飞; Sheng Z. M.; Zhang J.

收藏 | 浏览/下载：1214/82 | 提交时间：2009/09/18

laser fusion neutron sources particle beam focusing

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.

收藏 | 浏览/下载：70/0 | 提交时间：2013/03/25

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.

Nonlinear laser focusing using a conical guide and generation of energetic ions 期刊论文 OAI收割
phys. rev. e, 2008, 卷号: 78, 期号: 3, 页码: 36405
Cao Lihua; Yu Wei; Yu M.Y.; Xu Han; He X.T.; Gu Yuqiu (7); Liu Zhanjun; Li Jinghong; Zheng Chunyang

收藏 | 浏览/下载：1002/16 | 提交时间：2009/09/18

Conventional methods Energetic ions Focusing effects High-density Inner surfaces Laser focusing Laser-plasma interaction Light intensities Light pulses Particle-in-cell simulations Pulse shaping Punch-through Spot sizes Thin foils Thin target

Laser tunable Toraldo superresolution with a uniform nonlinear pupil filter 期刊论文 OAI收割
appl. optics, 2008, 卷号: 47, 期号: 21, 页码: 3689, 3693
魏劲松; Xiao Mufei

收藏 | 浏览/下载：1983/287 | 提交时间：2009/09/22

Focal spot size Focusing lens Laser powering Laser-induced Pupil filters Spot sizes Super resolutions

Key techniques of laser direct writing patterns on spherical substrate (EI CONFERENCE) 会议论文 OAI收割
3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies, AOMATT 2007: Design, Manufacturing, and Testing of Micro- and Nano-Optical Devices and Systems, July 8, 2007 - July 12, 2007, Chengdu, China
作者: Zhao J.-L.; Feng X.-G.

收藏 | 浏览/下载：36/0 | 提交时间：2013/03/25

Comparing with the writing method of plane pattern spherical pattern' has some remarkable different on several points. Firstly it is difficult to spin-coated a uniform photoresist film on a spherical substrate especially the ratio of spherical radius to caliber is smaller and the spin-coated way must match the ratio of spherical radius to caliber. Secondly if the sphere couldn't be regarded as a plane a so-called concentric optical scan movement way must be applied for the generation of spherical pattern because the reflex of substrate will affect the quantity of illumination. Commonly an alignment technique is indispensable with pattern generation of spherical surface by the concentric optical scan in order to ensure the orthogonal intersection of focusing laser beam and writing surface. Thirdly a uniform velocity control must be considered for the laser direct writing method on a spherical substrate. Otherwise the exposure time of photoresist will be different and the line widths of pattern will be also different at different areas. Fourthly commonly because the errors of concentric machine and substrate surface shape are bigger so focusing servo-control technique is also needful for writing a pattern on a spherical substrate. Focusing servo-control may keep the focal spot on the spherical surface by a focus detection and control system in the course of writing pattern. Using these techniques we fabricated a line width of 7m and a period of 600m isometric mesh on the concave of a spherical substrate.

Analysis of atom focusing for nanostructure fabrication with a completely off-resonant optical standing wave 期刊论文 OAI收割
ACTA PHYSICA SINICA, 2005, 卷号: 54, 期号: 6, 页码: 2645-2652
作者: Chen, XZ; Yao, HM; Chen, XN

收藏 | 浏览/下载：24/0 | 提交时间：2015/09/21

completely off-resonant standing-wave laser field atom focusing nanostructure fabrication