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design of a free-form lens system for short distance projection

Design of a free-form lens system for short distance project...

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Conference on current developments in Lens design and optical engineering Xii/Advances in Thin Film Coatings Vii

作者： Yang, Bo Lu, Kan Zhang, Wei Dai, Fujian Shanghai Univ Sci & Technol Shanghai Key Lab Contemporary Opt Syst Sch Opt Elect & Comp Engn Shanghai 200093 Peoples R China Zhejiang Sunny Opt Co Ltd R&D Dept Yuyao 315400 Zhejiang Peoples R China

ISBN: (纸本)9780819487384

A free-form lens system design is proposed for short distance projection. Free-form surface shape and non-rotational symmetrical structure provide us more freedoms for optimization. The catadioptric structure is also used to reduce the overall length of the whole system. The designed projector lens system consists of two parts. The first part is a rotationally symmetrical lens system which corrects the basic aberrations. The second part contains a free-form lens and a reflector which correct the distortion and other aberrations. We achieve 55inch projected image size at a display screen which is 300mm away from the lens system. The maximum distortion for all fields at all distances is less than 3%.

关键词： optical engine Projection lens Free-form Catadioptric Least-square fitting

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Proceedings of SPIE - The International Society for optical engineering: Introduction

Proceedings of SPIE - The International Society for Optical ...

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current developments in Lens design and optical engineering Xii;and Advances in Thin Film Coatings Vii

作者： Johnson, R. Barry Mahajan, Virendra N. Thibault, Simon Alabama A and M University United States Aerospace Corporation United States ImmerVision Canada University Laval Canada

This PDF file contains the front matter associated with SPIE Proceedings Volume 8128, including the Title Page, Copyright information, Table of Contents, Introduction, and the Conference Committee listing. © 2011... 详细信息

ISBN: (纸本)9780819487384

关键词： optical engineering

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Effects of Substrate heating and Vacuum Annealing on optical and Electrical Properties of Alumina-Doped ZnO Films Deposited by DC Magnetron Sputtering

Effects of Substrate heating and Vacuum Annealing on Optical...

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Conference on current developments in Lens design and optical engineering Xii/Advances in Thin Film Coatings Vii

作者： Tang, Chien-Jen Wang, Chun-Yuan Jaing, Cheng-Chung Minghsin Univ Sci & Technol Dept Optoelect Syst Engn Hsinchu 304 Taiwan

ISBN: (纸本)9780819487384

Alumina-doped zinc oxide (AZO) films have wide range of applications in optical and optoelectronic devices. AZO films have advantage in high transparency, high stability to hydrogen plasma and low cost to alternative ITO film. AZO film was prepared by direct-current (DC) magnetron sputtering from ceramic ZnO:Al2O3 target. The AZO films were compared in two different conditions. The first is substrate heating process, in which AZO film was deposited by different substrate temperature, room temperature, 150 degrees C and 250 degrees C. The second is vacuum annealing process, in which AZO film with deposited at room temperature have been annealed at 250 degrees C and 450 degrees C in vacuum. The optical properties, electrical properties, grain size and surface structure properties of the films were studied by UV-VIS-NIR spectrophotometer, Hall effect measurement equipment, x-ray diffraction, and scanning electron microscopy. The resistivity, carrier mobility, carrier concentration, and grain size of AZO films were 1.92x10(-3) Omega-cm, 6.38 cm(2)/Vs, 5.08x10(20) #/cm(3), and 31.48 nm respectively, in vacuum annealing of 450 degrees C. The resistivity, carrier mobility, carrier concentration, and grain size of AZO films were 8.72x10(-4) Omega-cm, 6.32 cm(2)/Vs, 1.13x10(21) #/cm(3), and 31.56 nm, respectively, when substrate temperature was at 250 degrees C. Substrate heating process is better than vacuum annealed process for AZO film deposited by DC Magnetron Sputtering.

关键词： Alumina-Doped ZnO films DC magnetron sputtering vacuum annealed substrate heating process optical properties Electrical properties

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Testing and design of a low-cost large scale solar simulator

Testing and design of a low-cost large scale solar simulator

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Conference on current developments in Lens design and optical engineering Xii/Advances in Thin Film Coatings Vii

作者： Meng, Qinglong Wang, Yuan Changan Univ Sch Environm Sci & Engn 12 Yanta Rd Xian 710054 Shaanxi Provinc Peoples R China Xi An Jiao Tong Univ Sch Energy & Power Engn Xian 710049 Shaanxi Provinc Peoples R China

ISBN: (纸本)9780819487384

To simulate solar radiation at the earth's surface, a new economical multiple-lamp solar simulator was designed. The solar simulator is comprised of 188 reflector sunlight dysprosium lamps whose light spectrum is very similar to air mass 1.5 (AM1.5) solar spectrum terrestrial standards. Lamps are configured in a hexagonal pattern with 15 columns of 12 or 13 lamps at a lamp-to-lamp spacing and column-to-column spacing of 295mm. Without altering the radiation spectral distribution, the average irradiance on target irradiated area can be adjusted over a wide range between 150 and 1100W/m(2) by means of the variation of lamps number or/and lamp-to-irradiated area distance. At the height of 2.0m the solar simulator provides 2mx1.5m irradiated area with over 1000 W/m(2). Measurement of irradiance indicates that the multiple-lamp simulator conforms to Class B of ASTM (American Society for Testing and Materials) Standard (ASTM E927-2005) in regard to spectrum match, irradiance uniformity and stability. To enlarge the effective irradiated area, two large mirror-like stainless steel plates was mounted on both of the long sides of the solar simulator. The radiation characteristics of simulator are improved and the optimized effectively irradiation surface is expanded up to 81.6%.

关键词： solar simulator irradiance nonuniformity temporal instability

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optical link card design for the phase ii upgrade of TileCal experiment

Optical link card design for the phase II upgrade of TileCal...

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作者： Carrió, F. Castillo, V. Ferrer, A. González, V. Higón, E. Marín, C. Moreno, P. Sanchis, E. Solans, C. Valero, A. Valls, J. Department of Electronic Engineering University of Valencia Valencia 46100 Spain Department of Atomic Molecular and Nuclear Physics Instituto de Física Corpuscular University of Valencia Valencia 46100 Spain

This paper presents the design of an optical link card developed in the frame of the R&D activities for the phase 2 upgrade of the TileCal experiment. This board, that is part of the evaluation of different technologies for the final choice in the next years, is designed as a mezzanine that can work independently or be plugged in the optical multiplexer board of the TileCal backend electronics. It includes two SNAP 12 optical connectors able to transmit and receive up to 75 Gb/s and one SFP optical connector for lower speeds and compatibility with existing hardware as the read out driver. All processing is done in a Stratix ii GX field-programmable gate array (FPGA). Details are given on the hardware design, including signal and power integrity analysis, needed when working with these high data rates and on firmware development to obtain the best performance of the FPGA signal transceivers and for the use of the GBT protocol. © 2006 IEEE.

关键词： optical fibers

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Doppler asymmetric spatial heterodyne (DASH) interferometer from flight concept to field campaign

Doppler asymmetric spatial heterodyne (DASH) interferometer ...

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Fourier Transform Spectroscopy, FTS 2011

作者： Babcock, David D. Harlander, John M. Englert, Christoph R. Roesler, Frederick L. Straatveit, Andrew N. Artep Inc 2992 Excelsior Springs Court Ellicott City MD 21042 United States St. Cloud State University Dept. of Physics Astronomy and Engineering Science 720 Fourth Ave. South MS-315 St. Cloud MN 56301 United States Naval Research Laboratory Space Science Division Code 7670 4555 Overlook Ave SW Washington DC 20375 United States Department of Physics University of Wisconsin-Madison 1150 University Avenue Madison WI 57306 United States

We will review a flight concept for a DASH optical spectrometer to passively measure upper atmospheric Doppler winds, a completed laboratory DASH prototype instrument, and current field campaign results. © 2011 OSA.

ISBN: (纸本)9781557529145

关键词： Spacecraft instruments

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Glow discharge optical emission spectroscopy for accurate and well resolved analysis of coatings and thin films

Glow discharge optical emission spectroscopy for accurate an...

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作者： Wilke, Marcus Teichert, Gerd Gemma, Ryota Pundt, Astrid Kirchheim, Reiner Romanus, Henry Schaaf, Peter MFPA Weimar Testing Center for Thin Films and Materials Properties POB 2310 99404 Weimar Germany Universität Göttingen Institut für Materialphysik Friedrich-Hund-Platz 1 37077 Göttingen Germany Ilmenau University of Technology Institute of Materials Engineering POB 10 05 65 98684 Ilmenau Germany

In the last years, glow discharge optical emission spectrometry (GDOES) gained more and more acceptance in the analysis of functional coatings. GDOES thereby represents an interesting alternative to common depth profiling techniques like AES and SIMS, based on its unique combination of high erosion rates and erosion depths, sensitivity, analysis of nonconductive layers and easy quantification even for light elements such as C, N, O and H. Starting with the fundamentals of GDOES, a short overview on new developments in instrument design for accurate and well resolved thin film analyses is presented. The article focuses on the analytical capabilities of glow discharge optical emission spectrometry in the analysis of metallic coatings and thin films. Results illustrating the high depth resolution, confirmation of stoichiometry, the detection of light elements in coatings as well as contamination on the surface or interfaces will be demonstrated by measurements of: a multilayer system Cr/Ti on silicon, interface contamination on silicon during deposition of aluminum, Al2O3-nanoparticle containing conversion coatings on zinc for corrosion resistance, Ti3SiC2 MAX-phase coatings by pulsed laser deposition and hydrogen detection in a V/Fe multilayer system. The selected examples illustrate that GDOES can be successfully adopted as an analytical tool in the development of new materials and coatings. A discussion of the results as well as of the limitations of GDOES is presented. © 2011 Elsevier B.V.

关键词： Pulsed laser deposition

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Adaptive optics on Petawatt lasers;current performance of the Texas Petawatt Laser

Adaptive optics on Petawatt lasers;current performance of th...

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Conference on Laser Resonators and Beam Control XiiI

作者： Martinez, Mikael Gaul, Erhard Borger, Teddy Aymond, Frances Hammond, Douglas Ringuette, Marty Escamilla, Ramiro Ditmire, Todd Caird, John Erlandson, Al Iovanovic, Igor Ebbers, Chris Molander, Bill Univ Texas Austin 2511 Speedway C1510 Austin Austin TX 78712 USA Lawrence Livermore Natl Lab Livermore CA 94550 USA

ISBN: (纸本)9780819484505

In this paper, we report on current developments aimed at improving the focusability of the Texas Petawatt Laser. Two major campaigns have been commissioned that address the issue of focusability. First, we implemented a closed loop, 32 actuator bi-moprh deformable mirror (DFM) to compensate for aberrations in the optical train and second, a color corrector lens assembly was installed that compensates for chromatic errors accumulated in broadband (>15 nm), large aperture (> 20 cm) laser systems. We will present in detail, pre and post correction results with the DFM and describe challenges faced when one activates a single shot, high energy closed loop system. Secondly, we will provide modeling and experimental results of our color correction system. This is a novel approach to a problem only seen in high energy, broadband, large aperture laser pulses. By using color correction optics we have demonstrated a 6X increase in focal intensity. With the installation of the DFM, the rms wavefront error in the system was reduced from 2.4 waves to. 131 waves, further increasing intensities seen at focus by 1 order of magnitude.

关键词： Wavefronts design for manufacturing Diagnostics Laser systems engineering Amplifiers Pulsed laser operation Adaptive optics Crystals Mirrors Wavefront sensors

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current developments in Lens design and optical engineering XI;and Advances in Thin Film Coatings VI

Current Developments in Lens Design and Optical Engineering ...

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current developments in Lens design and optical engineering XI;and Advances in Thin Film Coatings VI

ISBN: (纸本)9780819482822

The proceedings contain 35 papers. The topics discussed include: CCT-dependent calibration for colorimeters;high performance of color mixing and projection lighting based on color LEDs;research on angle-selective filters of phosphor color wheel for LED projectors;high-efficiency LED street light using micro-lens array;optical performance as a function of phosphor particle number in white LED;a novel approach for structural synthesis of zoom systems;accelerating diffractive optics design with GPU-based parallel technique;ultra-compact close-up microoptical imaging system;design and implementation of recording and readout system for micro-holographic optical data storage;perceptual image quality and telescope performance ranking;ion-beam figuring (IBF) for high-precision optics becomes affordable;and flat liquid crystal diffractive lenses with variable focus and magnification.

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Modeling and analysis of multi-junction solar cells

Modeling and analysis of multi-junction solar cells

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International Conference on Emerging Trends in Electrical and Computer Technology

作者： Shivaganaik, H. Jangamshetti, Suresh H. Basaveshwar Engineering College Bagalkot Karnataka India Department of Electrical and Electronics Basaveshwar Engineering College Bagalkot Karnataka India

ISBN: (纸本)9781424479238

In this paper a methodology to evolve an analytical design of a high efficiency multi-junction solar cell is presented. The multi-junction selected for the study is a four-junction tandem solar cell structure, ZnO-ZnSe-Si-Ge. These materials have wide range of band gap from 3.33 to 0.67 eV, so as to absorb maximum solar radiation. ZnO is used as top layer to work as transparent conductive oxide layer to minimize the optical reflection loss;ZnSe is used to match the band gap between ZnO and silicon to minimize transmission loss. Other materials, Silicon and germanium that have lower band gap absorb most of longer wave length photons and minimize transmission losses. An analytical model is developed and implemented using Matlab script file. Model is used to analyze various parameters to estimate short circuit current, open circuit voltage, and fill factor and efficiency of different junctions. Further efficiency enhancement of multi-junction solar cell is done at different conditions such as optimization of PN diode, adding an intrinsic layer to make PN as PIN diode and finally to add tunneling layer to make PIN as p-n-i-p+. Analytical efficiency of 76.69 % is obtained with optimization, intrinsic and tunneling layers at 1 SUN irradiation (incident power Pin=1 kW/m2). © 2011 IEEE.

关键词： ii-VI semiconductors

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