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检索条件"任意字段=Current Developments in Lens Design and Optical Engineering XVII"

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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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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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Flat liquid crystal diffractive lenses with variable focus and magnification

Flat liquid crystal diffractive lenses with variable focus a...

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

作者： Valley, Pouria Dodge, Mohammad Reza Schwiegerling, Jim Mathine, David Peyman, Gholam Peyghambarian, N. Univ Arizona Coll Opt Sci Tucson AZ 85721 USA

ISBN: (纸本)9780819482822

Non-mechanical variable lenses are important for creating compact imaging devices. Various methods employing dielectrically actuated lenses, membrane lenses, and/or liquid crystal lenses were previously proposed(1-4). Here we present tunable-focus flat liquid crystal diffractive lenses (LCDL) employing binary Fresnel zone electrodes fabricated on Indium-Tin-Oxide using conventional micro-photolithography. The phase levels can be adjusted by varying the effective refractive index of a nematic liquid crystal sandwiched between the electrodes and a reference substrate. Using a proper voltage distribution across various electrodes the focal length can be changed. Electrodes are shunted such that the correct phase retardation step sequence is achieved. If the number of 2 pi zone boundaries is increased by a factor of m the focal length is changed from f to f/m based on the digitized Fresnel zone equation: f = r(m)(2)/2m lambda, where r(m) is m(th) zone radius, and lambda is the wavelength. The lenses operate at very low voltage levels (+/- 2.5V ac input), exhibit fast switching times (20-150 ms), can have large apertures (> 10 mm), and small form factor, and are robust and insensitive to vibrations, gravity, and capillary effects that limit membrane and dielectrically actuated lenses. Several tests were performed on the LCDL including diffraction efficiency measurement, switching dynamics, and hybrid imaging with a refractive lens. Negative focal lengths are achieved by adjusting the voltages across electrodes. Using these lenses in combination, magnification can be changed and zoom lenses can be formed. The promising results make LCDL a good candidate for non-mechanical auto-focus and zoom lenses.

关键词： Diffractive lenses Liquid-crystal devices Active or adaptive optics Non-mechanical optical zoom Auto-focus Telescopes

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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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Proceedings of SPIE - The International Society for optical engineering 2010年 7786卷 ix-xii页

作者： Johnson, R. Barry Mahajan, Virendra N. Thibault, Simon

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current developments in lens design and optical engineering X

Current Developments in Lens Design and Optical Engineering ...

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current developments in lens design and optical engineering X

ISBN: (纸本)9780819477187

The proceedings contain 22 papers. The topics discussed include: optical design dependence on technology development;practical design considerations for modern photographic optics;display systems and registration methods for mixed reality applications;efficient design process for the evaluation and control of flare in opto-mechanical systems;finding order in the design landscape of simple optical systems;design and optimization of a collimating optical system for high divergence LED light sources;point symmetric design approach to a wide-field wide-wavelength cat's eye retro-reflector anastigmat;fast catadioptric optics with large field of view;thinking outside the barrel: what really matters in modern photographic lens design;calculation of optical forces on a dielectric bead in a geometrically aberrated trap;and relationships between lens performance and different sensor sizes in professional photographic still SLR cameras.

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Thinking outside the barrel: What really matters in modern photographic lens design

Thinking outside the barrel: What really matters in modern p...

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SPIE optical engineering + Applications

作者： Rockwell, Ken *** Post Office Box 8778 San Diego CA 92038-8778 United States

ISBN: (纸本)9780819477187

Because optical performance has increased so far with modern design software and aspherical manufacturing processes, optical performance is now the least important factor in modern photographic lens design. Far more important are ergonomic (usability) and systems-integration factors which determine a lens' acceptance by photographers, and ultimately, its commercial success. Common SLR cameras tend to have the most advanced systems and features, so they tend to be the focus of this paper simply because they offer the most to discuss. Inside-the-barrel optics and other design considerations have been covered in SPIE paper 7428-3. © 2009 Copyright SPIE - The International Society for optical engineering.

关键词： Bandpass filters

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optical design dependence on technology development

Optical design dependence on technology development

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Time and Frequency Metrology II

作者： Neil, Iain A. ScotOptix Via Miravalle 25A CH-6900 Massagno TI Switzerland

ISBN: (纸本)9780819477217

Specific developments in optical technology over the past thirty years including refractive materials, thin film coatings and surface profiles will be discussed. A large variety of optical designs which depend on some of these developments will be described. The optical design examples presented will cover the infrared, visible, ultraviolet and combinations of these wavebands. A novel multi-waveband optical system that utilizes many of these developments will be illustrated in several possible configurations to meet different application requirements. A summary of the technologies employed in all of the optical design examples will indicate whether or not there may be trends in optical technology development. The optical design examples will be taken from issued Patents or published Patent applications and hence their optical prescriptions will be available for detailed analysis. © 2009 SPIE.

关键词： Coatings

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Practical design considerations for modern photographic optics

Practical design considerations for modern photographic opti...

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SPIE optical engineering + Applications

作者： Rockwell, Ken *** Post Office Box 8778 San Diego CA 92038-8778 United States

ISBN: (纸本)9780819477187

In the 1950s, cameras and lenses didn't communicate. optical bench tests were sufficient to characterize lens performance completely. Today, optics are only one small factor in the much larger electro-optical systems which are today's cameras. Bench performance alone isn't enough. For a lens to be useful it must work in concert with modern cameras' focus, exposure and data systems. This paper explores these numerous issues and their influences on lens design. Outside-the-barrel ergonomic and systems issues are covered in SPIE paper 7428-19. © 2009 Copyright SPIE - The International Society for optical engineering.

关键词： Cameras

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