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检索条件"任意字段=Current Developments in Optical Design and Optical Engineering 1991"

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design of the hybrid refraction-diffraction lens with wavelength 10.6 mu m 6

Design of the hybrid refraction-diffraction lens with wavele...

引用

current developments in optical design and engineering VI Conference

作者： Chen, YS Li, DH Institute of Physics Chinese Academy of Sciences Beijing 100080 China

ISBN: (纸本)0819422517

In this paper, combining refractive and diffractive effects, a new kind of infrared lenses with wavelength 10.6 mu m was designed and produced for CO2 laser material processing. This refractive-diffractive lens (RDL) converts a CO2 laser beam into the rectangular shape with light intensity distribution in the concave shape at x-direction. A method which employs input aperture division and geometrical transformation technique for obtaining a better initial phase distribution of the iteration is presented. The experimental results show that the desired shape of the output light beam was obtained with a high efficiency in energy utilization.

关键词： binary optics diffractive optics infrared lens design

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Simulation of the optical performance of refractive elements to mimic the human eye focusing 16

Simulation of the optical performance of refractive elements...

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Conference on current developments in Lens design and optical engineering XVI

作者： Diaz-Gonzalez, G. Santiago-Alvarado, Agustin Cruz-Felix, Angel S. Univ Tecnol Mixteca Huajuapan De Leon 69000 Oax Mexico

ISBN: (纸本)9781628417449

Refractive optics has evolved and incorporated new elements in optical systems every day, such as conventional lenses, tunable lenses, GRIN lenses, diffractive lenses, intraocular lenses, etc. Some of these elements are reported in the literature together with different proposed models of the human eye. In this work, optical properties of some of these lenses will be studied, and simulations of their behavior will be done in order to analyze which one is better for imaging process. Such lenses will be incorporated in an optical system that mimics the human eye behavior. Analysis and obtained results are reported, as well as the proposed optical system. Finally, we present the conclusions of the work.

关键词： visual optics geometric optics matrix optics tunable lenses

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Diffraction efficiency evaluation of diffractive optical element (DOE) aberration corrector

Diffraction efficiency evaluation of diffractive optical ele...

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Conference on current developments in Lens design and optical engineering V

作者： Shen, MZ Huang, RH Chinese Acad Sci Inst Opt & Elect Chengdu 610041 Peoples R China

ISBN: (纸本)0819454613

A new way to evaluate the diffraction efficiency of the diffractive optical element (DOE), which serves as an aberration corrector in an infrared hybrid optical system, is proposed. The directly measured ensquared energy of the hybrid optical system is obtained through an experimental test. Then, the actual line spread function (LSF) of the system under test is measured, and the point spread function (PSF) is calculated from LSF based on the symmetric property of the system. The PSF is used to calculate the so-called derived ensquared energy. The ratio of the directly measured and the derived ensquared energy, defined as the diffraction efficiency of the DOE, represents the fraction of the energy focused onto the image point over the total input energy on the image plane, because the energy loss is caused by the scattering from the DOE corrector. The hybrid optical system, experimental setup, evaluation procedure, and the final results will be presented.

关键词： diffraction efficiency diffractive optical elements hybrid optical system radiometric measurement optical test infrared optical system

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Unique aspects of designing & tolerancing an optical testing system

Unique aspects of designing & tolerancing an optical testing...

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Conference on current developments in Lens design and optical engineering V

作者： Hadaway, JB Reardon, PJ Univ Alabama Ctr Appl Opt Huntsville AL 35899 USA

ISBN: (纸本)0819454613

The design & tolerancing of an optical testing system (OTS) presents a unique set of challenges not generally encountered during the typical optical design process. The authors have spent the past six years developing and using a series of optical systems designed to measure the surface figure & radius-of-curvature of various ultra-lightweight mirrors at 30 K. These mirrors were part of a technology development program to support NASA's James Webb Space Telescope (JWST). The design of these systems required consideration of the following: (i) potentially large figure errors in the test mirror (due to gravity sag & cryo-distortion), (ii) cryo-shrinkage of the aperture and radius-of-curvature, (iii) figure changes due to the use of mirror actuators, and (iv) vibration between the OTS & the test mirror. In addition, an exhaustive tolerancing process was required for each system in order to reach a set of alignment tolerances that were achievable using the equipment available and within the test environment. The authors found many aspects of the OTS design process to be significantly different from the norm;at the same time, however, viewing the process as a typical optical design problem often-times brought clarification. This paper will describe both the differences and the similarities observed between the design of an OTS as opposed to a traditional imaging system.

关键词： optical design tolerancing optical testing cryogenic

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Modeling diffractive optical elements in hybrid systems with the effect of the material dispersion

Modeling diffractive optical elements in hybrid systems with...

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Conference on current developments in Lens design and optical engineering IX

作者： Zhang, Hu Liu, Hua Lu, Zhenwu Zhang, Hongxin Ni, Zhengguo Chinese Acad Sci State Key Lab Appl Opt Changchun Inst Opt Fine Mech & Phys Changchun 130033 Peoples R China Chinese Acad Sci Grad Sch Beijing 100039 Peoples R China Aviat Univ Air Force Changchun 130022 Peoples R China

ISBN: (纸本)9780819472809

The diffractive optical element (DOE) is always modeled as an ideal pure diffractive clement which neglects the refractive dispersion of the clement's material. In this paper, a new model of the diffractive optical element is proposed, in which the effect of the refractive dispersion of the DOE's material is considered. The new model is explained and compared with standard diffraction-order expansion with the help of a hybrid system example. The analytical results show that the new model has an important meaning for the exact analysis of the hybrid refractive-diffractive optical system.

关键词： Diffractive optical clement material dispersion hybrid optical systems optical design

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design and Prototyping of a Freeform Light-Guide for Automotive Lighting 19

Design and Prototyping of a Freeform Light-Guide for Automot...

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19th Conference on current developments in Lens design and optical engineering

作者： Brand, Audrey C. Alisafaee, Hossein Rose Hulman Inst Technol Dept Phys & Opt Engn 5500 Wabash Ave Terre Haute IN 47803 USA

ISBN: (数字)9781510620629

ISBN: (纸本)9781510620629

We have designed a light-guide for lighting applications, including automotive headlamps. The light-guide is designed based on a free-form slab. Our intention has been to optimize the design for creating legal patterns. One of our objectives has been to investigate how the changes in the shape of the freeform light-guide affects the light pattern, and how the light source geometry affects the design. For prototyping purpose, we use a particular polymer that exhibits optical performance close to acrylic (PMMA).

关键词： Automotive Lighting Lighting Light-guide optical design Illumination

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A METHOD TO ANALYZE optical WAVE-GUIDES WITH ARBITRARY INDEX PROFILES 4

A METHOD TO ANALYZE OPTICAL WAVE-GUIDES WITH ARBITRARY INDEX...

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Conference on current developments in optical design and optical engineering IV

作者： PALACIOS, SL CRESPO, RD RODRIGUEZ, J FERNANDEZ, S VIRGOS, JM FERNANDEZ, JM GUINEA, A OLIVARES, J UNIV OVIEDO DEPT APPL PHYSE-33007 OVIEDOSPAIN

ISBN: (纸本)0819415871

We present a theoretical method which makes it possible to analyze 3-D integrated optical waveguides with arbitrary refractive index profiles. With this method it is easy to obtain effective indexes, propagation constants and coupling/switching properties of planar and channel optical waveguides. This theoretical approach involves modelling the original optical waveguide by means of an Equivalent optical Waveguide whose effective index is evaluated by applying a technique that we call the Asymptotic Effective Index Method. The theoretical results show good convergence and accuracy for effectives indexes, propagation constants and coupling/switching characteristics. © 1994 SPIE. All rights reserved.

关键词： optical waveguides

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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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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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Mechanical design and analysis of a variable focal length lens

Mechanical design and analysis of a variable focal length le...

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Conference on current developments in Lens design and optical engineering VIII

作者： Gonzalez-Garcia, Jorge Cruz-Martinez, Victor Manuel Mendoza-Jasso, Alvaro Jesus Santiago-Alvarado, Agustin Vazquez-Montiel, Sergio Rayas-Alvarez, Juan Antonio Castro-Ramos, Jorge Univ. Tecnológica de la Mixteca (Mexico) Instituto Nacional de Astrofísica Óptica y Electrónica (Mexico) Ctr. de Investigaciones en Óptica (Mexico)

ISBN: (纸本)9780819468154

Studies on adaptive lenses, which are formed of two transparent elastic surfaces and have a transparent liquid medium between them, have focused mostly on the characterization, analysis and optical performance of the proposed lenses. No attention, however, has been given to the mechanical design that would allow the conception of a user-friendly functional mounting that is adaptable to conventional optical systems. This work, therefore, presents the design and manufacturing processes of the mounting for a 20 mm diameter biconvex adaptive lens. It also presents an analysis of the membranes used as elastic surfaces and the images formation of the proposed lens.

关键词： adaptive elastic surfaces liquid lens mounting design

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