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

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optical design of Low Glare Luminaire Applied for Tunnel Light 15

Optical Design of Low Glare Luminaire Applied for Tunnel Lig...

引用

Conference on current developments in lens design and optical engineering XV

作者： Tsai, M. S. Lee, X. H. Lo, Y. C. Sun, C. C. Natl Cent Univ Dept Opt & Photon Chungli 320 Taiwan

ISBN: (纸本)9781628412192

In this study, a low glare and high-efficient tunnel lighting design which consists of a cluster light-emitting diode and a free-form lens is presented. Most of the energy emitted from the proposed luminaire is transmitted onto the surface of the road in front of drivers, and the probability that the energy is emitted directly into drivers' eyes is low. Compared with traditional fluorescent lamps, the proposed luminaire, of which the optical utilization factor, optical efficiency, and uniformity are, respectively, 44%, 92.5%, and 0.72, performs favorably in traffic safety, energy saving, and glare reduction.

关键词： Light-emitting diodes Illumination design Nonimaging optics optical design and fabrication

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Using saddle points for challenging optical design tasks 15

Using saddle points for challenging optical design tasks

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Conference on current developments in lens design and optical engineering XV

作者： Livshits, Irina Hou, Zhe van Grol, Pascal Shao, Yifeng van Turnhout, Maarten Urbach, Paul Bociort, Florian Natl Res Univ Informat Technol Mech & Opt 16 Birzhevaya Line St Petersburg 199034 Russia Delft Univ Technol Optic Res Grp NL-2628CJ Delft Netherlands TNO Sci & Ind NL-2628CK Delft Netherlands

ISBN: (纸本)9781628412192

The present research is part of an effort to develop tools that make the lens design process more systematic. In typical optical design tasks, the presence of many local minima in the optical merit function landscape makes design non-trivial. With the method of Saddle Point Construction (SPC) which was developed recently ([F. Bociort and M. van Turnhout, Opt. engineering 48, 063001 (2009)]) new local minima are obtained efficiently from known ones by adding and removing lenses in a systematic way. To illustrate how SPC and special properties of the lens design landscape can be used, we will present the step-by-step design of a wide-angle pinhole lens and the automatic design of a 9-lens system which, after further development with traditional techniques, is capable of good performance. We also give an example that shows how to visualize the saddle point that can be constructed at any surface of any design of an imaging system that is a local minimum.

关键词： saddle points wide-angle lens

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Effect of Injection Molding Processing Conditions on optical Properties of Polyetherimide 15

Effect of Injection Molding Processing Conditions on Optical...

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Conference on current developments in lens design and optical engineering XV

作者： Zhao, Wei Wall, Christopher Maddikeri, Raghavendra May, Andy SABIC Innovat Plast LLC 1 Lexan Lane Mt Vernon IN 47620 USA SABIC Innovat Plast LLC Pittsfield MA 01201 USA

ISBN: (纸本)9781628412192

SABIC's ULTEM (TM) (polyetherimide) resin has been the choice of material for injection moldable micro lenses and lens arrays in optical communication components such as transceivers due to its unique combination of physical, thermal and optical properties including high refractive index, low absorption in near IR range, good dimensional stability and high heat performance. It's known that processing conditions affect properties of final parts. Often the processing conditions are optimized for best mechanical properties, while their effect on optical properties is sidelined. In this study, the effect of injection molding processing conditions on optical properties of polyetherimide resin is discussed.

关键词： Polyetherimide Injection Molding Processing Conditions optical Properties lens

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Caustic surface of a plane wavefront refracted by a smooth arbitrary surface 15

Caustic surface of a plane wavefront refracted by a smooth a...

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Conference on current developments in lens design and optical engineering XV

作者： Avendano-Aleja, Maximino Univ Nacl Autonoma Mexico Ctr Ciencias Aplicadas & Desarrollo Tecnol Mexico City 04510 DF Mexico

ISBN: (纸本)9781628412192

We study the formation of caustic produced by smooth arbitrary surfaces considering a plane wavefront propagating parallel to the optical axis and impinging on the refracting surface. We have already seen that the shape of the caustic surface can represent the monochromatic aberrations that we call image errors, furthermore the shape of the caustic can be modified by changing the parameters of the lens in such a way that if the caustic surfaces is vanished the optical system produces a perfect image, on the other hand for a caustic possessing a large area it could be applied to design no-imaging optical systems. The shape of the caustic depends only on the indices of refraction involved in the process of refraction, the refracting surface which is formed by smooth arbitrary plano-convex lens. We provide an analytic equation for the caustic surface after refraction of a plane wave from every rotationally symmetric surface.

关键词： Refraction Aspheric lenses Wavefronts Ray tracing optical design Geometrical optics Monochromatic aberrations Light Radon Wave propagation

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Analysis of double conjugate zoom lens using tunable-focus lenses 15

Analysis of double conjugate zoom lens using tunable-focus l...

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Conference on current developments in lens design and optical engineering XV

作者： Novak, Jiri Novak, Pavel Miks, Antonin Czech Tech Univ Fac Civil Engn Dept Phys Prague 16629 6 Czech Republic

ISBN: (纸本)9781628412192

The work is focused on an analysis and modeling of paraxial imaging parameters of an optical system with a variable magnification or focal length, which keeps the position of object and image planes and entrance and exit pupil planes fixed. This system does not move its elements during the change of the magnification or the focal length. Such an effect can be achieved using tunable-focus active lenses. The described double conjugate zoom lens with tunable-focus lenses satisfies the requirement that object, image and pupil planes are fixed during the change of magnification or focal length. The system must be composed of at minimum three optical elements. Formulas are derived, which enable to determine focal lengths of individual elements of the optical system in a general case, when an object is situated in a finite or infinite distance from the optical system. Such an optical system can be principally used in the design of riflescopes with a variable magnification. This design of the riflescope has the advantage of the fixed position of its optical components (tunable-focus lenses). Further, the position of the exit pupil does not change and stays fixed in a fixed distance from the eyepiece during the change of magnification.

关键词： zoom lens tunable-focus lenses optical imaging first order optics riflescope

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Nonimaging Achromatic lens design for LED Direct-lit Backlight Applications 15

Nonimaging Achromatic Lens Design for LED Direct-lit Backlig...

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Conference on current developments in lens design and optical engineering XV

作者： Tsai, Meng-Che Chen, Bo-Song Lee, Tsung-Xian Natl Taiwan Univ Sci & Technol Grad Inst Appl Sci & Technol 43Sec 4Keelung Rd Taipei 106 Taiwan Natl Taiwan Univ Sci & Technol Grad Inst Color & Illuminat Technol Taipei 106 Taiwan

ISBN: (纸本)9781628412192

Nowadays, light emitting diodes (LEDs) have been widely used in backlight module for display technology. Most of researches tend to improve optical performance in specific applications, such as sufficient efficiency, desired intensity distribution and high illuminance uniformity. However, most of phosphor converted white LEDs have the problem of inducing impure white light. The undesired phenomenon of yellow ring or blue ring becomes more serious through incorrect secondary optical design. In this paper, we emphasize on enhancing the spatial color and illuminance uniformity of LED direct-lit backlight using nonimaging achromatic lens design. We propose a new design method to re-distribute and uniform the ratio of blue and yellow light on the target surface. Moreover, we further apply it in direct-lit LED backlight lens design, in which the uniformity of illuminance on the out coupling surface can be as much as 83.7% and the color uniformity (Delta u'v') is improved to 0.0039. Therefore, the result of high color and illumination uniformity can be achieved simultaneously.

关键词： LED direct-lit backlight Achromatic lens design Illuminance uniformity Color uniformity

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LED Collimation Module for Time Sequential Back Light System 15

LED Collimation Module for Time Sequential Back Light System

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Conference on current developments in lens design and optical engineering XV

作者： Lin, Jou-Hui Lee, Chi-Hung Tai, An-Ching Chen, Yu-Hsuan Ma, Shih-Hsin Feng Chia Univ Dept Photon Wenhwa Rd Taichung 40724 Taiwan Feng Chia Univ Dept Elect Engn Taichung 40724 Taiwan

ISBN: (纸本)9781628412192

In this study, a collimated LED light source has been developed as a colorful liquid crystal display backlight, which is driven by a two-field driving scheme to display color. In each field, the angular rays of two colors from LEDs are collimated by a collimation lens, redirected by a light guide and converged by a cylindrical-lens array to map into corresponding sub-pixel positions for efficiently displaying color image. The simulation results of the backlight module and the corresponding experimental results will be discussed in detail.

关键词： LED Backlight Collimation lens

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Employment of fluorescence for autofocusing in direct laser writing micro-/nano-lithography 15

Employment of fluorescence for autofocusing in direct laser ...

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Conference on current developments in lens design and optical engineering XV

作者： Malinauskas, Mangirdas Zukauskas, Albertas Belazaras, Kastytis Vilnius Univ Fac Phys Dept Quantum Elect Laser Res Ctr LT-10223 Vilnius Lithuania

ISBN: (纸本)9781628412192

Herein we present the implementation of autofocusing in multi-photon Direct Laser Writing (DLW) lithography. It is based on fluorescence occurring within the confined volume of a photopolymer/photoresin excitation resulting to a voxel generation. The proposed method is further successfully employed for the nanofabrication of large scale (500 nm in height, up to 25 mm(2) in area) Diffractive optical Elements (DOE). The produced structures are characterized using Scanning Electron Microscope (SEM) and confocal optical profilometry. The introduced technique is potential for a simple, price and effort efficient upgrade of currently existing DLW micro-/nano-lithography setups.

关键词： Direct laser writing femsosecond pulses two-photon polymerization multi-photon excitation nanolitography autofucusing photopolymers diffractive optical elements

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design and analysis of an adaptive lens that mimics the performance of the crystalline lens in the human eye 15

Design and analysis of an adaptive lens that mimics the perf...

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Conference on current developments in lens design and optical engineering XV

作者： Santiago-Alvarado, Agustin Cruz-Felix, Angel S. Iturbide-Jimenez, F. Martinez-Lopez, M. Ramirez-Como, M. Armengol-Cruz, V. Vasquez-Baez, I. Mixteca Technol Univ Huajuapan De Leon 69000 Oax Mexico

ISBN: (纸本)9781628412192

Tunable lenses are optical systems that have attracted much attention due to their potential applications in such areas like ophthalmology, machine vision, microscopy and laser processing. In recent years we have been working in the analysis and performance of a liquid-filled variable focal length lens, this is a lens that can modify its focal length by changing the amount of water within it. Nowadays we extend our study to a particular adaptive lens known as solid elastic lens (SEL) that it is formed by an elastic main body made of Polydimethylsiloxane (PDMS Sylgard 184). In this work, we present the design, simulation and analysis of an adaptive solid elastic lens that in principle imitates the accommodation process of the crystalline lens in the human eye. For this work, we have adopted the parameters of the schematic eye model developed in 1985 by Navarro et al.;this model represents the anatomy of the eye as close as possible to reality by predicting an acceptable and accurate quantity of spherical and chromatic aberrations without any shape fitting. An opto-mechanical analysis of the accommodation process of the adaptive lens is presented, by simulating a certain amount of radial force applied onto the SEL using the finite element method with the commercial software SolidWorks (R). We also present ray-trace diagrams of the simulated compression process of the adaptive lens using the commercial software OSLO (R).

关键词： Solid elastic lens tunable lens crystalline lens PDMS

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"Moth's eye" anti-reflection gratings on germanium freeform surfaces 15

"Moth's eye" anti-reflection gratings on germanium freeform ...

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Conference on current developments in lens design and optical engineering XV

作者： Liu, Meng Shultz, Jason A. Owen, Joseph D. Davies, Matthew A. Suleski, Thomas J. Univ N Carolina Ctr Optoelect & Opt Commun Charlotte NC 28223 USA Univ N Carolina Ctr Precis Metrol Charlotte NC 28223 USA

ISBN: (纸本)9781628412192

Germanium is commonly used for optical components in the infrared, but the high refractive index of germanium causes significant losses due to Fresnel reflections. Anti-reflection (AR) surfaces based on subwavelength "moth's eye" gratings provide one means to significantly increase optical transmission. As found in nature, these gratings are conformal to the curved surfaces of lenslets in the eye of the moth. Engineered optical systems inspired by biological examples offer possibilities for increased performance and system miniaturization, but also introduce significant challenges to both design and fabrication. In this paper, we consider the design and fabrication of conformal moth's eye AR structures on germanium freeform optical surfaces, including lens arrays and Alvarez lenses. Fabrication approaches and limitations based on both lithography and multi-axis diamond machining are considered. Rigorous simulations of grating performance and approaches for simulation of conformal, multi-scale optical systems are discussed.

关键词： biomimetic optics freeform surfaces conformal optics moth's eye gratings infrared optical modeling diamond machining interference lithography

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