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

共 445 条记录，以下是231-240 订阅

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Calculation of diffraction in the presence of aberrations by numerical methods based on critical points and semi-periodic zones

Calculation of diffraction in the presence of aberrations by...

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conference on current developments in lens design and optical Systems engineering

作者： Ferré-Borrull, J Bosch, S Univ Barcelona Dept Fis Aplicada & Opt E-08028 Barcelona Spain

ISBN: (纸本)0819437387

The numerical calculation of diffraction integrals in systems with aberrations is addressed from the point of view of a new geometrical interpretation of the diffraction phenomena. This interpretation is based on the division of the integration domain in semiperiodic zones that isolate the integrand oscillations. Moreover, the critical points of the aperture allow to identify the zones with a net contribution to the diffracted field. With the help of this interpretation it is possible to define methods for calculating the diffraction of a spherical wave incident on an aperture. We study the problems that arise when these methods have to be applied to waves in aberrated systems and we propose a solution based on the analysis of the behavior of the optical path of the wave incident on the exit pupil of the system.

关键词： diffraction integrals semi-periodic zones critical points aberrated optical systems

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Integral optical system design of injection molded optics

Integral optical system design of injection molded optics

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conference on current developments in lens design and optical engineering IV

作者： Bäumer, S Shulepova, L Willemse, J Renkema, K Philips High Tech Plast NL-5503 LP Veldhoven Netherlands

ISBN: (纸本)0819450464

Injection molded optics are frequently applied in many high volume applications. Bar code scanners.. CD / DVD systems, CMOS cameras are a few examples. In all of these applications cost effective and fast design cycles are essential. At Philips High Tech Plastics we developed a design system that touches on all different aspects of the system design. Starting with traditional lens design (sequential ray tracing) and tolerancing we transport the initial design into mechanical solid modeling. During mechanical modeling, tolerances, injection molding design rules and integration of mechanical features, reference marks, etc. are incorporated as well. Here the full advantage of injection molding can be utilized. After the opto - mechanical modeling the system is ported back to non - sequential ray tracing for ghost - and stray light analysis. Finally extended tolerancing is performed in order to come to a robust high volume product. If necessary all or several steps in this design process are repeated in order to arrive at the final design. As an additional requirement the metrology possibilities for the design are checked at an early stage. This integral system approach to optical design, including optical modeling (sequential and non-sequential) combined with mechanical solid modeling is presented using some recent examples.

关键词： injection molding imaging optics optics design

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Focusing regions evolution under linear transformations in the boundary condition 17

Focusing regions evolution under linear transformations in t...

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conference on current developments in lens design and optical engineering XVII

作者： Garcia-Guzman, A. De los Santos-Garcia, S. I. Torres, M. A. Munoz, J. Martinez-Niconoff, G. Inst Nacl Astrofis Opt & Elect INAOE Dept Opt Postal 51 & 216 Puebla Mexico

ISBN: (数字)9781510602861

ISBN: (纸本)9781510602854;9781510602861

The properties of optical surfaces generated by diffraction are studied analyzing the changes in the curvature function of the boundary condition. The study leads to establish a classification for the optical fields as elliptical, hyperbolical or parabolic. The elliptical regions are separated from hyperbolic regions by a region of parabolic type, which corresponds to optical focusing regions. The main result of the analysis leads us to describe and to control bifurcations and vortices effects allowing to geometrize and to control the topological properties of the optical field. For this feature is important to control the geometry of the parabolic region, obtained by controlling the curvature function in the boundary condition. The model is implemented experimentally applying a linear transformation in transmittances of zone plate type. The experimental results corroborate the theoretical predictions

关键词： Diffraction Zone plates Lead optical components Transmittance Fractal analysis optical design optical tweezers Particles Spectroscopy

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Procedures for speeding up the exact evaluation of diffraction integrals by semiperiodic-zone division of the integration domain

Procedures for speeding up the exact evaluation of diffracti...

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conference on current developments in lens design and optical engineering V

作者： Ferré-Borrull, J Bosch, S Dept Engn Elect Elect & Automat E-43007 Tarragona Spain

ISBN: (纸本)0819454613

We develop a method for the calculation of the integrals arising in the diffraction theory of aberrations. This method is developed from in a previous one based in the division of the diffracting aperture in semiperiodic zones, which enabled the exact calculation of the Point-Spread Function of an optical system. By a careful analysis of the integration process and of the properties of the semiperiodic zones, we develop a set of formulae that give an approximate value of the result of the diffraction integrals. This permits to avoid the numerical calculation of the integrals, which is a computationally intensive procedure and enables a substantial reduction of the computation times. The method has been tested on aberration-free optical systems and real optical systems and has shown a good accuracy, although some minor problems require further investigation.

关键词： point-spread function diffraction theory of aberrations optical system evaluation calculation methods

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All-plastic optical design for NIR region

All-plastic optical design for NIR region

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8th conference on current developments in optical design and optical engineering

作者： Ivanov, CD Nikolov, ID Univ Sofia Opt & Spect Dept BG-1126 Sofia Bulgaria

ISBN: (纸本)0819432652

A number of optical plastic materials are examined. The indices of refraction are measured in the visible and near-infrared spectral regions from 435.8 nm to 1052 mn. Some obtained data and Abbe constants are presented. The glass libraries of the optical design software packages are updated. The spherochromatic aberration balancing is analyzed during the all-plastic doublet and tripler synthesis for a working wavelengths interval from 600 nm to 900 nm. Two achromatic triplets are designed intended for NIR region. Three all-plastic 3X magnifiers are developed for NV goggles. The optical configurations are given. The aberration corrections are evaluated. The obtained optical performance is illustrated. Some conclusions for the trends in all-plastic optical design are drawn.

关键词： optical plastics index measurements lens design achromatization NIR magnifiers NV goggles

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Locating the local minima in lens design with machine learning 22

Locating the local minima in lens design with machine learni...

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conference on current developments in lens design and optical engineering xxII

作者： Kononova, Anna, V Shir, Ofer M. Tukker, Teus Frisco, Pierluigi Zeng, Shutong Back, Thomas Leiden Univ LIACS Leiden Netherlands Tel Hai Coll Comp Sci Dept Upper Galilee Israel Migal Inst Upper Galilee Israel ASML BV Veldhoven Netherlands

ISBN: (数字)9781510644670

ISBN: (纸本)9781510644670

We applied an extended version of the Niching-CMA-ES heuristic to search for local minima of the Cooke triplet, a renowned photographic lens design, of which 21 local minima were already known. The considered problem is defined by 6 input (decision) variables, namely the curvatures of the three lenses present in the Cooke triplet, and is driven by a single objective function, that is the RMS spot size. The applied approach found: (i) 19 out of the 21 known minima in a single run;(ii) 540 new local minima with objective values lower/equal to those of the known 21 minima;(iii) a large number of infeasible designs.

关键词： Cooke triplet local minima niching evolution strategy machine learning multimodal search landscapes

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Mechanical fabrication of precision microlenses on optical fiber endfaces

Mechanical fabrication of precision microlenses on optical f...

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conference on current developments in lens design and optical engineering V

作者： Milton, G Gharbia, Y Katupitiya, J Univ New S Wales Sch Mech & Mfg Engn Sydney NSW 2052 Australia

ISBN: (纸本)0819454613

We present a purely mechanical means of producing highly concentric spherical lenses at the endfaces of optical fibers. The production process has two stages. First, conical lenses are produced in a grinding process that ensures excellent concentricity. Then, the conical lenses are transformed to spherical lenses using a novel process called loose abrasive blasting. The cone grinding is carried out on a microgrinding machine, which has a sophisticated control system that enables the production of precision conical lenses. The blasting is carried out on a diamond blasting machine. Plots showing automatic centering performance of the microgrinding machine and scanning electron microscopy images of the conical and spherical lenses are presented. (c) 2005 Society of Photo-optical Instrumentation Engineers.

关键词： microlens optical fiber endface cone grinding

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Progressive addition lens design by optimizing NURBS surface

Progressive addition lens design by optimizing NURBS surface

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

作者： Liu, Yen-Liang Hsu, Wei-Yao Cheng, Yuan-Chieh Su, Guo-Dong Natl Taiwan Univ Grad Inst Photon & Optoelect 1Sec 4Roosevelt Rd Taipei 10617 Taiwan Natl Appl Res Labs Instrument Technol Res Ctr Hsinchu 300 Taiwan

ISBN: (纸本)9780819487384

Progressive addition lenses (PAL) are used to compensate presbyopia, which is induced by losing accommodation of elder eyes. These eyes need different optical power provided by eye glasses while watching objects at different distance. A smaller optical power is required in further distance and a larger one in nearer zone. A progressive addition lens can provides different power requirements in one piece of lens. This paper introduces a whole process of PAL production, from design, fabrication, to measurement. The PAL is designed by optimizing NURBS surface. Parameters of merit function are adjusted to design lenses with different specifications. The simulation results confirm that the power distributes as expected and cylinders are controlled under an acceptable level. Besides, sample lenses have been produced by injecting polycorbonate to the molds. Finally, Ultra Accuracy 3D Profilemeter is used to measure the sample PALs. Practical examinations shows that our designs are achievable and feasible in practice use.

关键词： progressive addition lens NURBS precision machining ultrahigh accurate 3 dimensional profilemeter UA3P

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optical design of an athermalised dual field of view step zoom optical system in MWIR 18

Optical design of an athermalised dual field of view step zo...

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conference on current developments in lens design and optical engineering XVIII

作者： Kucukcelebi, Doruk Roketsan Kemalpasa Mahallesi Sehit Yuzbasi Adem Kutlu Soka TR-06780 Ankara Turkey

ISBN: (纸本)9781510612082;9781510612075

In this paper, the optical design of an athermalised dual field of view step zoom optical system in MWIR (3.7 mu m-4.8 mu m) is described. The dual field of view infrared optical system is designed based on the principle of passive athermalization method not only to achieve athermal optical system but also to keep the high image quality within the working temperature between -40 degrees C and + 60 degrees C. The infrared optical system used in this study had a 320 pixel x 256 pixel resolution, 20 mu m pixel pitch size cooled MWIR focal plane array detector. In this study, the step zoom mechanism, which has the axial motion due to consisting of a lens group, is considered to simplify mechanical structure. The optical design was based on moving a single lens along the optical axis for changing the optical system's field of view not only to reduce the number of moving parts but also to athermalize for the optical system. The optical design began with an optimization process using paraxial optics when first-order optics parameters are determined. During the optimization process, in order to reduce aberrations, such as coma, astigmatism, spherical and chromatic aberrations, aspherical surfaces were used. As a result, athermalised dual field of view step zoom optical design is proposed and the performance of the design using proposed method was verified by providing the focus shifts, spot diagrams and MTF analyzes' plots.

关键词： Dual field of view step zoom optical design paraxial optics athermalization Mid Wave Infrared (MWIR)

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Multifocal Contact lens HDR Image Simulation Showing Dysphotopsia 23

Multifocal Contact Lens HDR Image Simulation Showing Dysphot...

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conference on current developments in lens design and optical engineering xxIII Part of SPIE Optics and Photonics conference

作者： Cvarch, Ben Schwiegerling, Jim Univ Arizona James C Wyant Coll Opt Sci 1630 E Univ Blvd Tucson AZ 85721 USA

ISBN: (纸本)9781510654198;9781510654181

A system is developed for simulating the image quality and dysphotopsia of multifocal lenses. To achieve this, the simulation modifies a High Dynamic Range (HDR) photograph by blurring it with the lens' point spread function in MATLAB. Dysphotopsias are instances of unwanted or missing light within the eye. Common forms of dysphotopsia include glare, starburst (radial lines emanating from bright sources), and halo (rings of light surrounding bright sources) with the latter two typically occurring at night or in other high contrast settings. Dysphotopsia is considered the most common complaint of patients after successful cataract surgery and have thus earned significant attention in the context of intraocular lenses (IOLs). There have been fewer studies of multifocal contact lens dysphotopsia, but this is despite the documented impact dysphotopsia has on the image quality of multifocal lenses. This simulation is the first handling of dysphotopsia that combines HDR images and specifics of the lens design to predict how the dysphotopsia will appear to patients. Being able to show patients accurate simulations of dysphotopsia has the benefit of setting proper patient expectations before they begin using multifocal lenses. Furthermore, these simulated images can also potentially help diagnose patient problems by giving patients an accurate baseline to compare to.

关键词： Multifocal contact lenses presbyopia dysphotopsia HDR optical simulation vision

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