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

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Linear decomposition of the optical transfer function for annular pupils 18

Linear decomposition of the optical transfer function for an...

引用

conference on current developments in lens design and optical engineering xviiI

作者： Schwiegerling, Jim Univ Arizona Coll Opt Sci 1630 E Univ Blvd Tucson AZ 85721 USA

ISBN: (纸本)9781510612082;9781510612075

A technique for decomposing the optical Transfer Function (OTF) into a novel set of basis functions has been developed. The decomposition provides insight into the performance of optical systems containing both wavefront error and apodization, as well as the interactions between the various components of the pupil function. Previously, this technique has been applied to systems with circular pupils with both uniform illumination and Gaussian apodization. Here, systems with annular pupils are explored. In cases of annular pupil with simple defocus, analytic expressions for the OTF decomposition coefficients can be calculated. The annular case is not only applicable to optical systems with central obscurations, but the technique can be extended to systems with multiple ring structures. The ring structures can have constant area as is often found in zone plates and diffractive lenses or the rings can have arbitrary areas. Analytic expressions for the OTF decomposition coefficients again can be determined for ring structures with constant and quadratic phase variations. The OTF decomposition provides a general tool to analyze and compare a diverse set of optical systems.

关键词： optical Transfer Function Modulation Transfer Function Annular Pupils Mathematics Decomposition

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Aspherical optics design for minimal spherical aberration in vision correction of human eyes

Aspherical optics design for minimal spherical aberration in...

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conference on current developments in lens design and optical engineering IX

作者： Jiang, Min-shan Lin, J. T. Zhou, Chuan-qing Ren, Qiu-shi Shanghai Jiao Tong Univ Inst Laser Med & Biophoton Shanghai Peoples R China Natl Taiwan Univ Inst Electroopt Taipei Taiwan

ISBN: (纸本)9780819472809

Using raytracing method (ZEMAX program), the reduction of SA of the whole human eye may be reduced via the combined effects of asphericity (Q) and the ratio of the front and back surface of an IOL. The overall SA for best image quality may be defined by Q* when the image position off axis is reduced to that of the paraxial. Our calculations show the following general features: (1) For a give Q value, the influence on the SA is proportional to the surface power;(2) for minimal whole eye SA, negative Q is needed in IOL;(3) for a given IOL power, the Q* is smaller when the front surface has a smaller power. All above features derived from numerical raytracing method are consistent with analytic formulas.

关键词： Spherical aberration raytracing huamn eye aspherical lens Q value LASIK surgery

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A water-polydimethylsiloxane liquid lens for variable focus experiments in an undergraduate laboratory 20

A water-polydimethylsiloxane liquid lens for variable focus ...

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conference on current developments in lens design and optical engineering XX

作者： Anonuevo, Johannes F. Guerrero, Raphael A. Ateneo Manila Univ Loyola Hts Sch Sci & Engn Dept Phys Quezon City 1108 Philippines

ISBN: (数字)9781510629028

ISBN: (纸本)9781510629028

Fluidic lenses offer tunability and flexibility that are not available with conventional solid lenses. The development of a variable focus lens has the potential for replacing bulky optical systems and allows the miniaturization of imaging optics used in digital cameras and mobile phone cameras. In this paper, a liquid lens platform for use in an undergraduate laboratory setting is presented. A variable lens is prepared by injecting water into bulk polydimethylsiloxane (PDMS) that remains uncured in its fluid state. We report the tunable focusing ability of this simple liquid lens system and analyze the change in focal length as a function of injected water volume. The water-PDMS interface acts as a diverging lens, in agreement with ray tracing analysis based on curvature and refractive indices. Variable focal lengths are measured with an optical set-up employing a helium-neon laser and a solid converging lens with focal length = 2.5 cm. By increasing the water volume from 0.05 to 0.30 ml, we are able to tune the focal length from -6.5 mm to -10.6 mm. lens geometry remains spherical as the curvature of the lens changes with the addition of water. Our experiments coincide with a simple theoretical framework for a thick lens immersed in a medium. The water-PDMS lens is a promising component of basic and advanced experiments in an undergraduate optics course.

关键词： Liquid lens PDMS Variable focus

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Cryogenic optical design and testing of the Focal Plane Opto-Mechanical Assembly for the Tropospheric Emission Spectrometer

Cryogenic optical design and testing of the Focal Plane Opto...

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conference on current developments in lens design and optical Systems engineering

作者： Crowther, BG Elwell, JD Anderson, RE Space Dynam Lab Logan UT 84341 USA

ISBN: (纸本)0819437387

The Tropospheric Emission Spectrometer (TES) is one of the instruments slated to fly on the EOS Aura satellite in 2003. TES is a Fourier transform spectrometer designed to measure the concentration of various tropospheric chemical species. The Focal Plane Opto-Mechanical Assemblies (FPOMAs) are situated at the end of the TES optical train and are comprised of cryogenic telescopes, reimaging optics, and focal planes. We present the cryogenic optical design of the FPOMA units and discuss optimization parameters and predicted performance. We present measured performance data and compare it with the predicted performance.

关键词： Tropospheric Emission Spectrometer TES Focal Plane Opto-Mechanical Assembly FPOMA optical design cryogenic performance

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design of Ultrashort Throw lenses with Catadioptric Relays for Curved Screens 22

Design of Ultrashort Throw Lenses with Catadioptric Relays f...

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conference on current developments in lens design and optical engineering XXII

作者： Nishikawa, Jun Nishiyama, Mariko Sony Grp Corp R&D Ctr Atsugi TEC 4-14-1 Asahi Cho Atsugi Kanagawa 2430014 Japan

ISBN: (数字)9781510644670

ISBN: (纸本)9781510644670

An ultrashort throw lens with a catadioptric relay (USTCR) for curved screens has a half-field angle greater than 110 degrees. The angle of the principal ray incident on the aspherical mirror increases according to the height of the ray emitted from the object surface. A larger field angle leads to larger sag amount. Thus, the degree of difficulty in precision machining increases. In this study, we examined how the tangent of the concave mirror surface can be reduced such that it can be manufactured while maintaining the half-field angle and its optical performance. It was found that the interval between imaging points reaching the screen can be made constant by suppressing the change in the principal ray incident on the concave mirror by +1- 1 degrees or less, particularly in the area of a half-field angle of 90 degrees or more, and making the change in the tangent of the concave mirror surface constant. As an index of distortion, we show that the perimeter ratio (Pr) of the frame length, which was equally divided by 5 x5 in the screen, improved from 0.26 to 0.73. As one possible application, a projection system that can be realized with only 8 projectors is proposed, as opposed to conventional systems consisting of approximately 20 projectors in omni-directional projection systems.

关键词： ultrashort throw lens aspheric mirror sag amount concave mirror catadioptric relay lens lens design curved screen omni-directional projection system

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design of ergonomic handpieces for a CO₂ laser system for surgical and cosmetological applications 19

Design of ergonomic handpieces for a CO<sub>2</sub> laser sy...

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19th conference on current developments in lens design and optical engineering

作者： Zavatskaia, Kseniia Voznesenskaya, Anna ITMO Univ Dept Appl & Comp Opt St Petersburg Russia

ISBN: (数字)9781510620629

ISBN: (纸本)9781510620629

The CO2 laser systems are widely used for different specialised surgery types and cosmetological procedures. The market is filled with various offers regarding the systems, however, every manufacturer supplies a very limited range of handpieces with the equipment. Thus, the work of surgeon or a medical worker is complicated by the discrepancy of a handpiece with the ergonomic/ technical requirements for a specific procedure. It may result in negative consequences of the procedure itself or a choice not in favor of laser technologies. The work presents the design of optical system and construction of specialised handpieces for CO2 laser system based on the discussion with medical workers of several hospitals that directly interact with the equipment and the technical requirements of medical procedures.

关键词： CO2 laser handpiece laser surgery optical design

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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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Diffractive optical systems adapted for the outer space operation

Diffractive optical systems adapted for the outer space oper...

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conference on current developments in lens design and optical Systems engineering

作者： Constantinov, B Pasechnic, T Sircu, S State Univ Moldova Dept Phys MD-2009 Chisinau Moldova

ISBN: (纸本)0819437387

Present paper considers a technique of diffraction element microminiaturization in the process of optical data recording onto photothermoplastic films (PTPFs) by using the photothermoplastic recording (PTPR) equipment adapted for outer space. It has been found that the application of surface - active substances (SAS) onto the free surface of PTPF facilitates the appearance and evolution of microdiffraction optical systems (whose period doesn't exceed 1 mum) on the profile of basic diffraction elements (with a period < 5 m). Miniature dimensions of microdiffraction elements provide high resolution without loss in diffraction efficiency, as the dimensions, shape (depth) of a diffraction element actually depend not only on the thickness of the visualising layer but also on SAS properties, namely on the dielectric and physical - chemical properties and, particulary, on the ability of SAS to influence onto the surface tension. The shift in the flow point of the visualising layer material provides the increase both in the diffraction efficiency and resolution at the expense of discretization of the surface diffraction elements into 2, 4, 6, ... microdiffraction elements.

关键词： photothermoplastic films surface - active materials resolution diffraction efficiency

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The design of a four-mirror anti-astigmatism astronomical telescope 20

The design of a four-mirror anti-astigmatism astronomical te...

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conference on current developments in lens design and optical engineering XX

作者： Huang, Jiun-Woei Taiwan Instrument Res Inst Natl Appl Labs 20 R&D 6 Rd Hsinchu 30076 Taiwan Natl Taiwan Univ Inst Appl Mech 1 Roosevelt Rd4 Sec Taipei 10617 Taiwan

ISBN: (数字)9781510629028

ISBN: (纸本)9781510629028

The design of four mirrors anti-astigmatism astronomical telescope is carried out for low earth orbit satellite. By integrating with Cassagrain and Schwartzschild configurations, the telescope is design. It contains four mirrors with conic surface, to form an aberration free. The system contains two parts: first part is the Cassagrain type telescope for pick up the ground object to the stop position, and the second part is Schwartzschild configurations as relay optics, which is to relay the image to high resolution CCD sensor to provide 0.5 ground space distance image. The system is symmetric with aberration free within a one cubic size fitted for small satellite. The optic mechanical is simple easy to assemble for optical calibration, while the body is rigid in space.

关键词： four mirrors anti-astigmatism astronomical telescope small satellite

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Exact ray tracing for an adaptive liquid lens with elastic surfaces

Exact ray tracing for an adaptive liquid lens with elastic s...

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conference on current developments in lens design and optical engineering VII

作者： Gonzalez-Garcia, J. Santiago-Alvarado, A. Vazquez-Montiel, S. Cordero-Davila, A. Castro-Gonzalez, G. Vera-Diaz, E. Lopez-Lopez, E. A. UTM Inst Fis & Matemat Huajuapan Leon Oaxaxo 6900 Mexico INAOE Inst Opt Puebla Mexico Benemerita Univ Autonoma Puebla Fac Ciencias Fis Matemat Puebla 72570 Mexico

ISBN: (纸本)0819463671

This study presents results obtained from the exact tracing of rays of an adaptive lens, that is, a liquid lens with transparent elastic surfaces. Because the elastics surfaces are deformed by a liquid, they acquire different curvatures depending on the difference in pressures of the liquid and of the environment. Images generated by this type of lens are simulated with a ray-tracing computer program, considering that each surface can be modeled with concentric spherical rings with different curvatures;this is because the elastic coefficients of the plastic materials used are non-linear.

关键词： adaptive elastic surfaces liquid lens refractor system

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