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

共 444 条记录，以下是191-200 订阅

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Development and Experimental Verification of an Intraocular Scattering Model

Development and Experimental Verification of an Intraocular ...

引用

conference on current developments in lens design and optical engineering XII/Advances in Thin Film Coatings VII

作者： Jiang, Chong-Jhih Jhong, Tian-Siang Chen, Yi-Chun Sun, Ching-Cherng Natl Cent Univ Dept Opt & Photon Jhongli 320 Taiwan

ISBN: (纸本)9780819487384

An intraocular scattering model was constructed in human eye model and experimentally verified. According to the biometric data, the volumetric scattering in crystalline lens and diffusion at retina fundus were developed. The scattering parameters of cornea, including particle size and obscuration ratio, were varied to make the veiling luminance of the eye model matching the CIE disability glare general formula. By replacing the transparent lens with a cataractous lens, the disability glare curve of cataracts was generated and compared with that of transparent lenses. The MTF of the intraocular scattering model showed nice correspondence with the data measured by a double-pass experiment.

关键词： intraocular scattering volumetric scattering veiling luminance disability glare cataractous lens double pass

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Spatial resolution of an optical microscope with oblique illumination 20

Spatial resolution of an optical microscope with oblique ill...

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conference on current developments in lens design and optical engineering XX

作者： Borovytsky, Volodymyr Natl Tech Univ Ukraine Igor Sikorsky KPI Opt Engn Dept Pr Peremogy 37 UA-03056 Kiev Ukraine

ISBN: (数字)9781510629028

ISBN: (纸本)9781510629028

This paper presents the theory for numerical evaluation of the spatial resolution along an optical axis of an optical microscope in case of oblique illumination. It considers the optical setup with a coherent light source, a microscope condenser, a grating located in a plane with an optical axis and with grating slits perpendicular to this axis and a microscope objective. It is proposed the analytical expression for calculation of the minimal resolvable period of this grating or the corresponded spatial cutoff frequency that characterizes the spatial resolution along the optical axis. It is demonstrated that this spatial cutoff frequency is not proportional to the angle of beam inclination. The proposed theory clearly explains why an optical microscope has the limited spatial resolution along an optical axis and how illumination can maximize this resolution.

关键词： Fourier optics image formation diffraction theory optical microscopy spatial resolution Abbe theory optics education spatial cutoff frequency spatial bandwidth

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Five lens corrector for Cassegrain-form telescopes.

Five lens corrector for Cassegrain-form telescopes.

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conference on current developments in lens design and optical engineering IX

作者： Ackenriann, Mark R. McGraw, John T. Zimmer, Peter C. Sandia Natl Labs Livermore CA 94550 USA Univ New Mexico Albuquerque NM 87131 USA

ISBN: (纸本)9780819472809

Refractive elements are commonly used on Cassegrain-form telescopes to correct off-axis aberrations and both widen and flatten the field. Early correctors used two lenses with spherical surfaces, but their performance was somewhat limited. More recent correctors have three or four lenses with some including at least one aspheric surface. These systems produce high resolution images over relatively wide fields but often require the corrector and mirrors to be optimized together. Here we present a new corrector design using five spherical lenses. This approach produces high image quality with low distortion over wide fields and has sufficient degrees of freedom to allow corrector to be optimized independent of the mirrors if necessary.

关键词： Survey telescope wide-field corrector Cassegrain Ritchey-Chretien

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Characterization of a tunable liquid-filled lens with minimum spherical aberration 17

Characterization of a tunable liquid-filled lens with minimu...

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conference on current developments in lens design and optical engineering XVII

作者： Diaz-Gonzalez, G. Santiago-Alvarado, A. Munoz-Lopez, J. Juarez-Salazar, R. Cruz-Felix, A. S. Jimenez-Barriga, N. Univ Tecnol Mixteca Carretera Acatlima Km 2-5 Mexico City 69000 DF Mexico Inst Nacl Astrofis Optic Elect Luis Enrique Erro 1 Puebla 72840 Mexico Inst Politecn Nacl CONACYT CITEDI Ave Inst Politecn Nacl 1310 Tijuana 22435 BC Mexico

ISBN: (数字)9781510602861

ISBN: (纸本)9781510602854;9781510602861

Tunable lenses have become very popular elements due their capacity of change their focal length by only modifying their shape. This characteristic is very useful in different applications in the field of optics. The development of tunable lenses consists on several phases: first, to find a suitable material, second, to obtain an optimal analysis and design, and third, to find the way to change the lens shape and characterization. In this work we present the characterization of a tunable lens, formed by spherical profiled elastic membranes and a liquid medium between them. The proposed liquid-filled tunable has a design such that the spherical aberration is the least to different focus. The development of an optomechanical system to change the lens shape is presented.

关键词： Tunable lens liquid filled lens opto-mechanical design

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Using a two-lens afocal compensator for thermal defocus correction of catadioptric system 18

Using a two-lens afocal compensator for thermal defocus corr...

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conference on current developments in lens design and optical engineering XVIII

作者： Ivanov, S. E. Romanova, G. E. Bakholdin, A. V. St Petersburg Natl Res Univ Informat Technol Mech 49 Kronverksky Prospekt St Petersburg 197101 Russia

ISBN: (纸本)9781510612082;9781510612075

The work associates with the catadioptric systems with two-component afocal achromatic compensator. The most catadioptric systems with afocal compensator have the power mirror part and the correctional lens part. The correctional lens part can be in parallel, in convergent beam or in both. One of the problems of such systems design is the thermal defocus by reason of the thermal aberration and the housing thermal expansion. We introduce the technique of thermal defocus compensation by choosing the optical material of the afocal compensator components. The components should be made from the optical materials with thermo-optical characteristics so after temperature changing the compensator should become non-afocal with the optical power enough to compensate the image plane thermal shift. Abbe numbers of the components should also have certain values for correction chromatic aberrations that reduces essentially the applicable optical materials quantity. The catalogues of the most vendors of optical materials in visible spectral range are studied for the purpose of finding the suitable couples for the technique. As a result, the advantages and possibilities of the plastic materials application in combination with optical glasses are shown. The examples of the optical design are given.

关键词： Afocal compensator athermalization catadioptric system optical material

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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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A hardware-based simulation platform for optical design and engineering

A hardware-based simulation platform for optical design and ...

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conference on current developments in lens design and optical engineering VII

作者： Ortiz, Fernando E. Durbano, James P. Sharkawy, Ahmed S. Shi, Shouyuan Curt, Petersen F. EM Photon 51 E Main StSuite 203 Newark DE 19711 USA

ISBN: (纸本)0819463671

optical lenses and systems have historically been of interest to the design and simulation community due to their extensive use in a variety of applications, including telecommunications and imaging. To simulate these systems, it is often possible to take advantage of symmetry or apply physical approximations, such as ray tracing and/or beam propagation, in order to avoid a rigorous solution of Maxwell's equations. However, in cases where these techniques are not applicable, such as when feature sizes become comparable to the wavelength of interest, full-wave electromagnetic simulations are required. Unfortunately, the time constraints and simulation sizes associated with many designs render this analysis infeasible or impractical, a problem that is aggravated by iterative design flows. Hence, a numerical platform capable of handling such computationally intense problems is necessary. In this paper, we present a hardware-based, full-wave simulation platform and demonstrate the advantages of hardware acceleration for the simulation of optical applications. Specifically, we will present a diffractive optical element (DOE) lens simulation, comparing results with previously published analytic and experimental data. We then modify the basic lens arrangement to produce an optical beam splitter. Because such a device cannot be analytically described using symmetry, this example will demonstrate the unique advantages of powerful hardware solvers for the analysis of DOE applications. Finally, we discuss how hardware-based solvers are critical for iterative designs by means of a 1-to-3 beam splitter example. This simulation system represents a new era in optical engineering, enabling the design of next-generation devices today.

关键词： optics lens DOE splitter design hardware simulation FDTD FPGA acceleration

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Accuracy and sensitivity analysis of the conical null-screen based corneal topographer 17

Accuracy and sensitivity analysis of the conical null-screen...

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conference on current developments in lens design and optical engineering XVII

作者： Cossio-Guerrero, Cesar Campos-Garcia, Manuel Univ Nacl Autonoma Mexico Ctr Ciencias Aplicadas & Desarrollo Tecnol Mexico Apdo Postal 70-186 Mexico City 04510 DF Mexico

ISBN: (数字)9781510602861

ISBN: (纸本)9781510602854;9781510602861

In every optical testing method, the time taken to process data, the precision of the results and the sensitivity are among the most relevant aspects to be taken into account when the viability of its implementation is been under consideration. An accuracy and sensitivity analysis of a topographer based on a conical null-screen with a semi-radial distribution of targets is presented. On the other hand, we proposed a custom evaluation algorithm in order to reduce the time in the calculation of the normal to the corneal surface. Finally, we perform some corneal topographical measurements.

关键词： Null-Screen optical Metrology Corneal Topography

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The importance of Petzval correction in generalized Offner designs 11

The importance of Petzval correction in generalized Offner d...

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conference on current developments in lens design and optical engineering XXI

作者： Rogers, John R. Rakich, Andrew Synopsys Inc 199 S Los Ro Bles Ave Pasadena CA 91101 USA Mersenne Opt Consulting 41 Rimu Rd Raumati Beach 5032 Paraparaumu New Zealand

ISBN: (数字)9781510637719

ISBN: (纸本)9781510637719

In this paper we examine the third-order aberrations of the "generalized Offner" family of designs comprising three concentric mirrors, with the first and third mirrors being not necessarily identical in radius and including the possibility that the object might be displaced from the common centers of curvature. We develop analytic expressions relating the first-order and third-order properties of the system to the radii of the three mirrors and to the object distance. Although one might expect a ring-field system to be relatively tolerant of field curvature, we show that the Petzval Sum affects the other aberrations in an extraordinary manner.

关键词： lens design aberration theory monocentric concentric

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Requirements for the design and production of high numerical aperture objectives for 4Pi confocal microscopy

Requirements for the design and production of high numerical...

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conference on current developments in lens design and optical engineering II

作者： Sure, T Wesner, J Heil, J Leica Microsyst GmbH D-35578 Wetzlar Germany

ISBN: (纸本)0819441554

We discuss the requirements on design and production regarding geometric and chromatic aberrations for objectives used in 4Pi confocal microscopy. We show that even the selection of a category 1/1 glass will not automatically assure that these requirements are met. due to residual variations in the Abbe number nu within the manufacturers tolerances. Consequently, the optical design has to take into consideration the possibility of balancing chromatic aberrations by varying selected air spacings in the final assembly of each individual objective. We also demonstrate. that for analyzing the influence of aberrations on the intensity distribution along the optical axis. a scalar diffraction theory is still applicable and very useful.

关键词： 4Pi confocal microscopy geometrical aberrations chromatic aberrations diffraction limited objectives scalar diffraction theory apodization depolarization Twyman-Green interferometer

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