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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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design of a discrete scan laser focusing system with a ring grating scan element

Design of a discrete scan laser focusing system with a ring ...

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Conference on current developments in lens design and optical engineering ix

作者： Rodgers, J. Michael Opt Res Associates Pasadena CA 91107 USA

ISBN: (纸本)9780819472809

An optical system application required a high speed laser scanning subsystem that produced high quality extended images focused at 32 discrete separated positions along a line, rather than continuously varying positions along the line as in more familiar scanning systems. This paper describes the optical design trades and selection of a grating-based scan element that produces this unusual type of scan, and the optical design methods that corrected aberrations produced by the scan element. A variety of different grating-based scan element designs were explored, in a flat disk geometry, but these produced excessive aberrations, both in the absolute level and in the magnitude of variation with scan. A ring-shaped scan element geometry was identified, which greatly minimized the scan-varying aberrations and brought them to near acceptable levels. Additional cylindrical corrector elements were added near the ring scan element to reduce the astigmatism of the ring substrate, and cylindrical lenslets were placed near the focus to provide further independent correction of astigmatism in each scan position. The resulting design achieved diffraction limited wavefront quality across the scan range.

关键词： optical design gratings scanning systems

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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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lens design and system optimization for foveated imaging

Lens design and system optimization for foveated imaging

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Conference on current developments in lens design and optical engineering ix

作者： Curatu, George Harvey, James E. LightPath Technol 2603 Challenger Tech Ct Orlando FL 32826 USA Univ Cent Florida Orlando FL 32816 USA

ISBN: (纸本)9780819472809

Foveated imaging addresses the need for compact wide-angle imagers capable of high-resolution and compressed data transmission. The principle behind foveated imaging is to cover a wide field-of-view (FOV) with a relatively simple and compact low-resolution lens, and use a liquid crystal spatial light modulator (SLM) to correct wavefront aberrations at any selected field point. The SLM correction provides a high-resolution fovea that can be actively moved anywhere within the FOV. While most research has focused so far mainly on SLM performance, the general trend being to increase SLM resolution and modulation depth, the actual lens design and system optimization aspects were often neglected. In this paper, we propose a wide-angle lens design intended for foveated imaging applications, and discuss typical tradeoffs. Taking this design as an example, we present a method to estimate the smallest SLM resolution required to correct the wavefront error effectively, showing that with the appropriate design, this resolution can be reduced up to 10 times compared to current designs. Increasing the SLM resolution beyond this point and increasing the modulation depth above one wavelength is not necessary, and will actually reduce the performance of the imaging system. We also demonstrate the importance of fabrication tolerances, and we propose a method to calibrate the SLM in order to cancel out all additional wavefront aberrations introduced by fabrication and assembly errors.

关键词： foveated imaging adaptive optics wide-angle lenses aberration compensation spatial light modulators liquid crystal devices

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Correctly making panoramic imagery and the meaning of optical center

Correctly making panoramic imagery and the meaning of optica...

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Conference on current developments in lens design and optical engineering ix

作者： Johnson, R. Barry Alabama A&M Univ Dept Phys Normal AL 35762 USA

ISBN: (纸本)9780819472809

The production and viewing of panoramic scenes have fascinated people for over a millennium beginning with the camera obscura. With the advent of photography in the mid-1800s, techniques were developed to create panoramic scenes far larger than could be realized by a single camera. Making a panoramic scene from two or more images taken using a film camera was found to be challenging. Various advanced techniques for making panoramic images were developed during the 20(th) century and required specialized cameras and film processing. In recent years, digital cameras and powerful software programs have become readily available to aid in making panoramic imagery although often strange artifacts appears in the composite image. This is generally due to improperly locating the rotation axis of the camera. Interestingly, there is significant argument about where the axis of rotation should be for making proper panoramic imagery. The most common "answer" is the rotation axis should be about the second or rear nodal point, which will be shown in this paper to be incorrect. A second "answer" is to rotate the camera about its optical center. This is also incorrect;however, what actually constitutes the optical center of a lens and its applications will be briefly discussed. Examples of correctly and incorrectly produced panoramic image will be presented.

关键词： optical center cardinal points nodal imaging panoramic panorama Gauss Listing nodal planes

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Development and optical testing of the camera, hand lens, and microscope probe with scannable laser spectroscopy (CHAMP-SLS)

Development and optical testing of the camera, hand lens, an...

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Conference on current developments in lens design and optical engineering ix

作者： Mungas, Greg S. Guersel, Yekta Sepulveda, Cesar A. Anderson, Mark La Baw, Clayton Johnson, Kenneth R. Deans, Matthew Beegle, Luther Boynton, John CALTECH Jet Prop Lab 4800 Oak Grove Dr Pasadena CA 91109 USA NASA Ames Res Ctr Moffett Field CA 94035 USA

ISBN: (纸本)9780819472809

Conducting high resolution field microscopy with coupled laser spectroscopy that can be used to selectively analyze the surface chemistry of individual pixels in a scene is an enabling capability for next generation robotic and manned spaceflight missions, civil, and military applications. In the laboratory, we use a range of imaging and surface preparation tools that provide us with in-focus images, context imaging for identifying features that we want to investigate at high magnification, and surface-optical coupling that allows us to apply optical spectroscopic analysis techniques for analyzing surface chemistry particularly at high magnifications. The camera, handlens, and microscope probe with scannable laser spectroscopy (CHAMP-SLS) is an imaging/spectroscopy instrument capable of imaging continuously from infinity down to high resolution microscopy (resolution of similar to 1 micron/pixel in a final camera format), the closer CHAMP-SLS is placed to a feature, the higher the resultant magnification. At hand lens to microscopic magnifications, the imaged scene can be selectively interrogated with point spectroscopic techniques such as Raman spectroscopy, microscopic Laser Induced Breakdown Spectroscopy (micro-LIBS), laser ablation mass-spectrometry, Fluorescence spectroscopy, and/or Reflectance spectroscopy. This paper summarizes the optical design, development, and testing of the CHAMP-SLS optics.

关键词： Camera hand lens microscope microscopy spectroscopy Raman micro-LIBS Fluorescence laser ablation mass-spectrometry

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OPTIMIZATION OF ORIGINAL lens STRUCTURE TYPE FROM optical lens DATA-BASE

OPTIMIZATION OF ORIGINAL LENS STRUCTURE TYPE FROM OPTICAL LE...

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5TH CONF ON current developments IN optical design AND optical engineering

作者： YANG, DR JIANG, HL LI, GD YANG, HM Changchun Institute of Optics and Fine Mechanics (China)

ISBN: (纸本)0819406554

This paper presents a new idea for the optimization of an initial lens structure type from an optical lens database on the basis of introducing optical lens database (OLDB) and computer- aided optical design (CAOD) systems. Using image-quality target parameters as conditional search parameters of optimization of initial lens structure type from database, and evaluating selected lens quality with surface relative aperture (h/r), the authors were able to obtain a good effectiveness in practice.

关键词： Image quality optical design lens design optical engineering Databases Glasses Optics manufacturing Crystal optics Mechanics Objectives

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design and Implementation of Recording and Readout System for Micro-holographic optical Data Storage

Design and Implementation of Recording and Readout System fo...

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

作者： Takashima, Yuzuru Hesselink, Lambertus Stanford Univ Dept Elect Engn Stanford CA 94305 USA

A lens design having constant working distance while having variable recording depth for micro holographic data storage system has been proposed. Variation of focal length is suppressed for the entire depth within 1% ... 详细信息

ISBN: (纸本)9780819482822

关键词： Holographic Storage Aberrations lens design

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Man versus Machine: a lens design Challenge

Man versus Machine: a Lens Design Challenge

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Conference on current developments in lens design and optical engineering XIV

作者： Dilworth, Donald C. Shafer, David Optical Systems Design Inc. (United States) David Shafer Optical Design (United States)

After a generation of writing and improving lens design software, it is time to assess where we are. Specifically, can a modern program compete with, or surpass, the best human designers? Here we describe a friendly c... 详细信息

ISBN: (纸本)9780819496911

关键词： lens design global optimization optimization algorithms aberration theory

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25 years of progress in lithographic optics design methods 25

25 years of progress in lithographic optics design methods

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Conference on current developments in lens design and optical engineering XXV

作者： Shafer, David David Shafer Opt Design Fairfield CT 06824 USA

Several new optical design methods have been developed over the last 25 years for lithographic optics, leading to greatly improved designs.

ISBN: (纸本)9781510679221;9781510679238

Several new optical design methods have been developed over the last 25 years for lithographic optics, leading to greatly improved designs.

关键词： optical lithography aspherics lenses mirrors

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ALGEBRAIC APPROACH FOR OPTIMIZING A TRIPLET lens

ALGEBRAIC APPROACH FOR OPTIMIZING A TRIPLET LENS

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Conference on current developments in optical design and optical engineering III

作者： KASSIM, AM AL QUDS UNIV COLL SCI & TECHNOLDEPT PHYSJERUSALEMISRAEL

ISBN: (纸本)081941249X

Using the concept of matrix theory for lens design, a triplet lens can be replaced by a singlet lens which has an equivalent system matrix without changing its optical performance. Then, using third order Siedel's first aberration coefficient of the singlet lens is equal to zero, and the focal length and the physical length of the triplet lens are kept constant as constraints, an algebraic technique for optimizing a triplet lens is derived. Results show that this new optimizing technique is more effective than other conventional techniques for optimizing a triplet lens in the case of plane waves.

关键词： lens design Electronic filtering Monochromatic aberrations Refractive index Spherical lenses Geometrical optics optical design optical properties Physics Image quality

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