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High power fiber lasers: current status and future perspectives

JOURNAL OF THE optical SOCIETY OF AMERICA B-optical PHYSICS 2010年第11期27卷 B63-B92页

作者： Richardson, D. J. Nilsson, J. Clarkson, W. A. Univ Southampton Optoelect Res Ctr Southampton SO17 1BJ Hants England

The rise in output power from rare-earth-doped fiber sources over the past decade, via the use of cladding-pumped fiber architectures, has been dramatic, leading to a range of fiber-based devices with outstanding performance in terms of output power, beam quality, overall efficiency, and flexibility with regard to operating wavelength and radiation format. This success in the high-power arena is largely due to the fiber's geometry, which provides considerable resilience to the effects of heat generation in the core, and facilitates efficient conversion from relatively low-brightness diode pump radiation to high-brightness laser output. In this paper we review the current state of the art in terms of continuous-wave and pulsed performance of ytterbium-doped fiber lasers, the current fiber gain medium of choice, and by far the most developed in terms of high-power performance. We then review the current status and challenges of extending the technology to other rare-earth dopants and associated wavelengths of operation. Throughout we identify the key factors currently limiting fiber laser performance in different operating regimes-in particular thermal management, optical nonlinearity, and damage. Finally, we speculate as to the likely developments in pump laser technology, fiber design and fabrication, architectural approaches, and functionality that lie ahead in the coming decade and the implications they have on fiber laser performance and industrial/scientific adoption. (C) 2010 optical Society of America

关键词： current status Fiber HIGH POWER Fibre Sources High power fiber lasers Heat generation operating wavelength Output power

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optical performance as a function of phosphor particle number in white LED

Optical performance as a function of phosphor particle numbe...

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Conference on current developments in Lens design and optical engineering XI - and Advances in Thin Film Coatings VI

作者： Chen, Cheng-Chien Chen, Ching-Yi Chien, Wei-Ting Yang, Tsung-Hsun Sun, Ching-Cherng Natl Cent Univ Inst Lighting & Display Sci Dept Opt & Photon Chungli 320 Taiwan

ISBN: (纸本)9780819482822

In this paper, we demonstrate a method to calculate the phosphor particle numbers and study the relationship among phosphor particle numbers, light output and correlated color temperature (CCT) of LEDs under remote package type and dispensing package type. We also discuss the influence of the thickness and concentration of phosphors on the performance of LEDs. We compare the various thicknesses and concentrations to check the resultant CCT and the output flux, where we can see that the lumen output is almost equal as the phosphor particle numbers is similar with the CCT at 6500 +/- 200 and 5000 +/- 100 K under the remote package type.

关键词： Particle number CCT Phosphor

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Research on Angle-selective Filters of Phosphor Color Wheel for LED Projectors

Research on Angle-selective Filters of Phosphor Color Wheel ...

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Conference on current developments in Lens design and optical engineering XI - and Advances in Thin Film Coatings VI

作者： Wei, Tzu-Chiao Kuo, Chien-Cheng Huang, June-Jei Lee, Cheng-Chung Natl Cent Univ Thin Film Technol Ctr Dept Opt & Photon Chungli 320 Taiwan Delta Elect Inc Tainan Taiwan

ISBN: (纸本)9780819482822

We have designed and fabricated angle-selective filters to increase the luminous throughput of a blue light emitting diode (LED) and its associated color wheel. The emission direction was tailored to increase the light emission in the useful direction by using multilayer optical coating with alternating high and low refractive indices layers. The angle selective filters limit the luminance angle to less than an acceptance angle of 30 degrees for green and red on the phosphors color wheel. The filters increase the luminance efficiency by converging and recycling the light. The color performance of the phosphors color wheel was improved and gave an advantage of energy saving in the LED projector.

关键词： optical thin film angle selective filter phosphor color wheel Light Emitting Diode

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A novel approach for structural synthesis of zoom systems

A novel approach for structural synthesis of zoom systems

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Conference on current developments in Lens design and optical engineering XI - and Advances in Thin Film Coatings VI

作者： Hazra, L. N. Pal, S. Univ Calcutta Dept Appl Opt & Photon Kolkata India

ISBN: (纸本)9780819482822

A new approach for 'ab initio' synthesis of thin lens structure of zoom lenses is reported. This is accomplished by an implementation of evolutionary programming, based on Genetic Algorithm, which explores the available configuration space formed by powers of individual components and inter-component separations. Normalization of the variables is carried out to get an insight on the optimum structures. The method has been successfully used to get thin lens structures of mechanically compensated, optically compensated, and linearly compensated zoom lens systems by suitable formulation of merit function of optimization. Investigations have been carried out on three component and four component zoom lens structures. Illustrative numerical results are presented.

关键词： optically compensated zoom lenses mechanically compensated zoom lenses evolutionary programming genetic algorithm thin lens design

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The design and fabrication of telecentric lens with large field of view

The design and fabrication of telecentric lens with large fi...

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Conference on current developments in Lens design and optical engineering XI - and Advances in Thin Film Coatings VI

作者： Chang, Chun-Li Huang, Kuo-Cheng Wu, Wen-Hong Lin, Yi-Hung Natl Appl Res Labs Instrument Technol Res Ctr Hsinchu Taiwan Natl Pingtung Univ Sci & Technol Dept Engn Mech Pingtung Taiwan

In ultra-precision (distortion 100 mm). Based on the concept of equivalent design in optical tolerances, the lens module can be designed readily into a telecentric system, which consists of five spherical lenses and a... 详细信息

ISBN: (纸本)9780819482822

In ultra-precision (distortion <0.5%) vision inspection system, the accuracy of measurement depends on sharpness and distortion of image. The telecentric lens provides distortion-free and constant magnification (within depth of field) image, so it has become an indispensable key module in the amount of visual measuring system. The article presents a design and development of telecentric lens module for the wide range of vision inspection system (field-of-view >100 mm). Based on the concept of equivalent design in optical tolerances, the lens module can be designed readily into a telecentric system, which consists of five spherical lenses and a glass molded aspheric lens. In order to correct image distortion, an aspheric lens would be added to the telecentric system. The experiment shows that the distortion can be reduced from 1.5% to 0.34% and the depth of field (DOF) is also improved up to 28.3 mm.

关键词： telecentric lens machine-vision aspheric lens equivalent tolerance

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Accelerating diffractive optics design with GPU-based parallel technique

Accelerating diffractive optics design with GPU-based parall...

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Conference on current developments in Lens design and optical engineering XI - and Advances in Thin Film Coatings VI

作者： Liu, Kan Li, Hui Zhang, Xinyu Li, Dehua Wei, Mingyue Li, Bin Xie, ChangSheng Zhang, Tianxu Huazhong Univ Sci & Technol Inst Pattern Recognit & Artificial Intelligence State Key Lab Multispectral Informat Proc Technol Wuhan 430074 Hubei Peoples R China Wuhan Natl Lab Optoelect Wuhan 430074 Peoples R China

ISBN: (纸本)9780819482822

In this paper GPU based data parallel technique is used to reduce calculating time in diffractive optics elements (DOE) design. By using compute unified device architecture (CUDA) framework, comparison of acceleration radio of some major methods using in DOE design, including Gerchberg Saxton algorithm for global optimization in conjunction with Rayleigh-Sommerfeld diffractive integrating transformation, genetic algorithm with a finite-difference time-domain method and simulated annealing algorithm, is made with demonstrational DOE-lens design, whose focal spot size is 0.5 mu m, incident light wavelength is 650 nm, focal length is 3mm, DOE aperture size is 2mm.

关键词： DOE design GPU acceleration CUDA Algorithm comparison

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Electro-chromic device with GZO as a conductive layer

Electro-chromic device with GZO as a conductive layer

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Conference on current developments in Lens design and optical engineering XI - and Advances in Thin Film Coatings VI

作者： Chan, Chih-Chao Tang, Chien-Jen Lee, Kun-Hsien Jaing, Cheng-Chung Kuo, Chien-Cheng Chen, Hsi-Chao Lee, Cheng-Chung Natl Cent Univ Thin Film Technol Ctr Dept Opt & Photon Chungli 320 Taiwan MingHusin Univ Sci & Technol Dept Appl Mat & Optoelect Engn Hsinchu Taiwan Natl Yunlin Univ Sci & Technol Grad Sch Optoelect Yunlin Taiwan

ISBN: (纸本)9780819482822

Thin films of tungsten oxide (WO3) were deposited on GZO-coated B270 glass substrates and thin films of Ta2O5 were deposited on B270 glass substrates by electron beam gun evaporation at high vacuum pressure of 3x10(-5) Torr and varied oxygen pressures ranging from 1.0x10(-4) to 6.0x10(-4) Torr. The optical properties of the electro-chromic (EC) film were measured by a spectrophotometer. The optical modulation (Delta T) of the tungsten oxide thin film deposited at an oxygen pressure of 1.0x10(-4) Torr was found to be Delta T = 67.46% at lambda=550nm. The optimum optical properties for deposition of Ta2O5 were attained at an oxygen pressure of 4x10(-4) Torr. Gallium doped zinc oxide (GZO) was used as a conductive layer instead of ITO. A five layer EC device (Glass/GZO/WO3/Ta2O5/NiO/Al) has been design and fabricated.

关键词： Electro-chromic devices transparent conducting oxide tungsten oxide optical modulation

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Bound-Abrasive Grinding and Polishing of Surfaces of optical Materials

Bound-Abrasive Grinding and Polishing of Surfaces of Optical...

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Conference on current developments in Lens design and optical engineering XI - and Advances in Thin Film Coatings VI

作者： Filatov, Yuriy D. Filatov, Olexandr Yu Monteil, Guy Heisel, Uwe Storchak, Michael Natl Acad Sci Ukraine Bakul Inst Superhard Mat 2 Avtozavodskaya UA-04074 Kiev Ukraine Natick Res Dev & Engn Ctr F-25000 Besancon France Univ Stuttgart D-70174 Stuttgart Germany

ISBN: (纸本)9780819482822

Problems of improving efficiency and quality of diamond-abrasive finishing of optical materials by tools with bounded polishing powders, including diamond powder, by means of the improvement of the machining technology and application of new tools with functionally oriented designs and characteristics of working layer are considered. A model has been proposed of the slime particle formation and directional removal as well as of the generation of a high-quality surface in diamond-abrasive finishing of optical materials taking into account the peculiarities of the mass transfer in the contact zone and statistic character of the distribution of slime particles by size. The dependences of the particle number on the diffusion angle and coordinate of the contact have been derived in the studies of the dynamics of collision and diffusion of slime particles. The coordinate dependence of the flat surface roughness of glass K8 optics in fine diamond grinding has been described. Interaction and dispersion of deterioration particles in a contact zone of the tool and a processed sample in the course of polishing is described and the dispersion structure of deterioration particles of the tool on slime particles and on deterioration particles is explained oscillatory. It is shown, that differential dispersion section of deterioration particles on slime particles no less than on deterioration particles as much as possible at corners of dispersion close to 0 and 180o on the central sites of a contact zone. Coordinate dependence of full dispersion section of deterioration particles of the tool and dependence of microprofile height of the processed surface on circular zones radius are calculated. Conformity of experimental and theoretical microroughness profiles of a polished surface on a quartz sample is shown.

关键词： Grinding Polishing optical materials Slime particles Collision Diffusion Roughness

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Improving the optical and electrical properties of fluorine-doped tin oxide films by various post-annealing treatments

Improving the optical and electrical properties of fluorine-...

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Conference on current developments in Lens design and optical engineering XI - and Advances in Thin Film Coatings VI

作者： Chen, Pin-Jen Liao, Bo-Huei Kuo, Chien-Cheng Lee, Cheng-Chung Natl Cent Univ Thin Film Technol Ctr Dept Opt & Photon Chungli 320 Taiwan

ISBN: (纸本)9780819482822

Transparent conducting Fluorine-doped tin oxide (FTO) thin films were deposited on glass substrates by pulsed DC magnetron sputtering from cost saving metal targets. We observed lower resistivity and higher average transmittance in the visible range after the application of various post heating treatments. The electrical and optical properties of FTO films were investigated. When the annealing temperature is 400 degrees C in air, the average transmittance is 79.79% with the lowest resistivity of 1.38x10(-3) Omega-cm, carrier density of 2.27x10(20) cm(-3) and mobility of 20 cm(2)/V-s. When the annealing temperature is 400 degrees Cin a H-2 5%+N-2 95% atmosphere, the average transmittance is 79.75 % with the lowest resistivity of 1.26x10(-3) Omega-cm, carrier density of 2.17x10(20) cm(-3) and mobility of 22.8 cm(2)/V-s. When the annealing temperature is 350 degrees Cin vacuum, the average transmittance is 80.48% with the lowest resistivity of 1.23x10(-3) Omega-cm, carrier density of 4.40x10(20) cm(-3) and mobility of 11.6 cm(2)/V-s.

关键词： Pulse DC magnetron sputtering CF4 FTO TCO Post-annealing

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Flying Plasmonic Lens at Near Field for High Speed Nano-lithography

Flying Plasmonic Lens at Near Field for High Speed Nano-lith...

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Conference on Alternative Lithographic Technologies ii

作者： Pan, Liang Park, Yong-Shik Xiong, Yi Ulin-Avila, Erick Zeng, Li Sun, Cheng Bogy, David B. Zhang, Xiang Univ Calif Berkeley NSF Nanoscale Sci & Engn Ctr NSEC Berkeley CA 94720 USA

ISBN: (纸本)9780819480514

optical lithography has been the key for continuous size reduction of semiconductor devices and circuits manufacturing(1-2). Although the industry is continually improving the resolution, optical lithography becomes more difficult and less cost effective in satisfying the ever increasing demands in nano-manufacturing. Besides manufacturing, the dramatic advancements in nanoscale science and engineering also call an urgent need for high-throughput nano-fabrication technologies that are versatile to frequent design changes. Here we experimentally demonstrated the capability of patterning with 50 nm linewidth with a high flying speed at 10 meter/second. This low-cost nano-fabrication scheme has the potential of a few orders of magnitude higher throughput than current maskless techniques, and promises a new route towards the next generation nano-manufacturing. Besides its application in nanolithography, this technique can also be used for nanoscale metrology, imaging and data storage.

关键词： Plasmonics Head Nanolithography Near field optical lithography Near field optics Data storage Lithography Metals Optics manufacturing

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