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

共 1426 条记录，以下是1241-1250 订阅

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PHASE QUANTIZATION AND DISCRETIZATION IN DIFFRACTIVE OPTICS

PHASE QUANTIZATION AND DISCRETIZATION IN DIFFRACTIVE OPTICS

引用

CONF ON current developments IN optical engineering 4

作者： GOLUB, MA SISAKJAN, IN SOIFER, VA Central Design Institute of Un (Israel) Central Design Institute of Un (Russia) Central Design Institute of Unique Instrumentation (Russia)

ISBN: (纸本)0819403954

Theoretical description of phase discretization and quantization is provided for coaputer generated optical eleients (CGOK). Suitable estiiations of seanaquared and iaxiaui aberrations, Strehl nuaber and aean wavefront deviation are derived in dependence of discretization and quantization paraieters. A diffractive aberration corrector for thin len5 and also phase diffractive coipensator for aspheric wavefront foriation are investigated as exasples, 1 . PROBLEM OF CGOE D ISCRETI ZAT ION AND QUANTI ZAT ION. Wide-range possibilities of coaputer generated holograis and optical eleients1' are soietiies liiited by discretization of their phase transfer function. The known aethods for studying phase nonlinearities treat quantization as a superposition of iany diffraction orders but do not take discretization into account. In this paper coibined studying of discretization and quantization is perforied for siooth phase functions such as of zoned phase plates, coipensators, Fresnel lenses and siiilar type CGOK. Digital holography applications provide us coiputer generated optical elesents including kinoforis' with purely phase-type t'ransfer function r (t) exp{***25rrrt (p(a)] (1) where • : (u,v) are 2-D Cartesian coordinates in the CGOI's plane, 'f (ii) is the phase shift perforied in point IT, iod2,,,tf ) is the value of 'p the aodulo (2ira), 1:1 or another positive nuiber. Coiputer-aided design of CGOK includes calculation of digital saiples for 'P function brought to [O,2%a) interval, driving suitable nak generator to access grey-level or binary iasks. Grey-level iasks used in bleaching or photopolyaer technology yield a CGO with variable iicrorelief thickness. optical lithography with a set of binary aasks or iulti-stepped electron-beaw lithography yields aulti-level COOK described by quantization of 'P . Raster scanning iask generator set up all saska ii the field G fros so called resolution cells G7that are centered in i;point, enuierated by dou

关键词： Quantization Wavefronts optical engineering Ions Raster graphics Spatial resolution Aspheric lenses Binary data Diffraction Phase transfer function

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DISCUSSION OF REFLECTION MICROCIRCULATION MICROSCOPE design

DISCUSSION OF REFLECTION MICROCIRCULATION MICROSCOPE DESIGN

引用

CONF ON current developments IN optical engineering 4

作者： ZHENG, DY CHEN, RY GE, ZF JING, FQ HU, WF WANG, BM Zhejiang Univ. (China) Hangzhou Traditional Chinese Medicine Hospital (China)

ISBN: (纸本)0819403954

Reflection microcirculation microscope has wide application value in studyiny microcirculation and microrheology , and joining with different equipment can do many ways of the studies , So research and improvement the instrument and development advanced appendant technology will produce a active sence to the study of biomedicine. In this paper , We introduce mainly the design idea of reflection microcirculation microscope which was studied by us ,and discuss some prombles.

关键词： Microscopes Objectives Blood Capillaries optical engineering Organisms Photography Illumination engineering Image analysis Image transmission

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INVESTIGATION OF THE OPTOMECHANICAL PROPERTIES OF PMMA AND THEIR APPLICATIONS IN PRESSURE SENSORS .2. PLASTIC ELASTIC

INVESTIGATION OF THE OPTOMECHANICAL PROPERTIES OF PMMA AND T...

引用

CONF ON current developments IN optical engineering 4

作者： YOUSIF, RH HAJIM, KI NAIMEE, KS Univ of Baghdad Baghdad Iraq

ISBN: (纸本)0819403954

The optomechanical properties of poly(methyl methacrylate) (PMMA) blocks imposed to indentation pressure are investigated. The intensity of a He-Ne laser beam transmitted through the blocks is found to fade down to zero (cutoff point) in an oscillatory manner as the indentation enlarged. The indentation pressure at cutoff is independent of the specimen's thickness and length (optical path). This pressure can therefore be used to account for the specimens hardness in plastic-elastic regime.

关键词： Polymethyl Methacrylates

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CORRECTING CHROMATIC ABERRATION IN HOLOGRAPHIC optical-SYSTEMS

CORRECTING CHROMATIC ABERRATION IN HOLOGRAPHIC OPTICAL-SYSTE...

引用

CONF ON current developments IN optical engineering 4

作者： YAMAGISHI, F KATO, M MAEDA, S INAGAKI, T Fujitsu Labs. Ltd. (Japan) Fujitsu Labs. Ltd. (Japan)

ISBN: (纸本)0819403954

A new method for correcting comatic aberration in holographic optical systems which uses constant optical path(COP) has been developed. The sum of the optical path lengths from an object wavefront to an image wavefront remains constant, and achromatic holographic systems can be easily calculated. Using COP, a new focusing triplet was designed with wavelength tolerance of 9 nm for entrance and exit numerical apertures of 0.5. This is 15 times larger than that for conventional single holographic lens.

关键词： Holography Chromatic aberrations Holograms Diffraction Lens design Spatial frequencies Wavefronts Tolerancing optical engineering Laser optics

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design CONSIDERATION OF CHINESE LONG BASE-LINE STELLAR INTERFEROMETER

DESIGN CONSIDERATION OF CHINESE LONG BASE-LINE STELLAR INTER...

引用

CONF ON current developments IN optical engineering 4

作者： ZHAO, PQ ZHOU, BF Acad Sinica Research Cent for Astronomical Instruments Nanjing China

ISBN: (纸本)0819403954

Many fundamental astronomical problems need much higher resolution than is afforded by atmospheric visibility or the diffraction limit of even the largest telescope being planned. The only way to meet these demands is by a distributed array of telescopes similar to those used in radio astronomy, or the long baseline stellar interferometry. China is planning to build a small-aperture long- baseline stellar optical interferometer for three purposes. One purpose is to clear up some problems before building a large and expensive interferometer. The second is to measure angular diameters of stars and angular distances between double stars. The third is to modify it for astrometry use in the future. In this paper, the design tolerance and specifications of the interferometer are discussed based on the astronomical requirements.

关键词： Interferometers

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design AND FABRICATION OF HIGH DAMAGE THRESHOLD TURNING MIRRORS FOR THE NOVA LASER

DESIGN AND FABRICATION OF HIGH DAMAGE THRESHOLD TURNING MIRR...

引用

CONF ON current developments IN optical engineering 4

作者： WOLFE, CR KOZLOWSKI, MR MARCHI, FT RAINER, F ENEMARK, E Lawrence Livermore National Lab. (United States) Optical Coating Lab. Inc. (United States)

ISBN: (纸本)0819403954

Laser induced damage to optical components severely limits the operating fluence of high peak power lasers used for fusion research such as the Nova laser at the Lawrence Livermore National Laboratory. In particular, surfaces and optical thin films often damage at a lower fluence than bulk materials in large aperture, high quality optics. We have designed and are fabricating new 94 cm turning mirrors for Nova as part of the "Precision Nova" program to improve beam quality. A new design has been optimized for updated optical performance specifications including increased damage resistance. The new mirror design will operate at all turning angles required by the ten Nova beamlines. This flexibility reduces mirror inventory and fabrication cost. A process of "conditioning" the mirror coating has been developed that is permanent and increases the damage threshold by as much as a factor of 2-3x.

关键词： Mirrors Laser damage threshold Coating Reflectivity Raster graphics Thin films optical engineering Laser induced damage Multilayers Objectives

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developments IN CRTS FOR HMD APPLICATIONS

DEVELOPMENTS IN CRTS FOR HMD APPLICATIONS

引用

CONF ON HELMET-MOUNTED DISPLAYS 2

作者： LEYLAND, JD WALTERS, F ETHERINGTON, DG Rank Brimar Ltd. (United Kingdom)

ISBN: (纸本)0819403415

The developtent of three hi4i resolution miniature cRT 's for the He1ut ?'bunted Display Alication is described with reference to the detailed construction. The design considerations for such tubes are discuss1 with reference to the trade offs in terms of display perfonrnce arxI physical parareters . current state of the art arxi future performance potential is indicated.

关键词： Head-mounted displays Particles CRTs Raster graphics Fourier transforms Fiber optics Electron beams Luminous efficiency Manufacturing Packaging

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FABRY-PEROT TUNABLE FILTER FOR THE VISIBLE AND NEAR IR USING NEMATIC LIQUID-CRYSTALS

FABRY-PEROT TUNABLE FILTER FOR THE VISIBLE AND NEAR IR USING...

引用

CONF ON current developments IN optical engineering 4

作者： BONACCINI, D CASINI, L STEFANINI, P Osservatorio Astrofisico di Ar (Germany) Osservatorio Astrofisico di Arcetri (Italy) Osservatorio Astrofisico di Ar (Italy)

ISBN: (纸本)0819403954

A nematic liquid crystal Fabry-Perot interferometer (NLC-FPI) based on nematic material in a parallel configuration is described, for applications in astronomy. This device allows spectral chopping for an efficient removal of background radiation, when the source is embedded in a strong background such as the solar corona or IR sources. The primary design is intended for two-dimensional spectroscopic imaging. This method is also very useful for precision spectropolarimetry. The NLC-FPI is a tunable, double-channel filtec we present some theoretical and experimental results obtained on a first generation pmtotype.

关键词： Fabry–Perot interferometers Refractive index Liquid crystals Prototyping optical engineering Molecules Reflectivity Crystals Polarization Tunable filters

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design OF SHACK-HARTMANN PLATE WITH GRIN ROD LENSES

DESIGN OF SHACK-HARTMANN PLATE WITH GRIN ROD LENSES

引用

CONF ON current developments IN optical engineering 4

作者： ZHAO, PQ ZHOU, BF Acad Sinica Research Cent for Astronomical Instruments Nanjing China

ISBN: (纸本)0819403954

The Shack-Hartmann (S-N) wavefront sensor, which is derived from the classical Hartmann testing method, is one of the most convenient methods available for the optimal testing of telescopes on site on natural stars. It also has many applications in adaptive optics, active optics and CAM of optical mirror. The principle of the method is explained. Light from the tested source and from a reference source is collimated by a lens and incides upon an S-H plate which is a lens array. Each lenslet forms two point images. The distance between each pair of images reflects the angular aberration of the tested wavefront over the subaperture. A method of producing S-N plates with GRIN rod lenses is described. The experimental S-H plate has 10x10 GRIN rod lenses.

关键词： Image Sensors

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current developments in optical engineering IV

Current Developments in Optical Engineering IV

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current developments in optical engineering IV

The Proceedings of the Conference contains 27 papers representing the very latest developments in the optical and optical engineering subject areas not covered in the other conferences at the annual San Diego meeting. This Proceedings includes papers on basic optical design and engineering, e.g. the optomechanical laboratory hardware, its organization, terminology and devices;a precision dual positioning system;a Wollaston polarizer in imaging systems;a 20-element long focal length zoom lens;photolithographic lenses;a reflection microcirculation microscope. The session on optical fabrication and testing includes papers on computer simulation of interferometer performance;adaptive optics wavefront corrector using addressable liquid crystal retarders;microlens array manufacture;design of Shack-Hartmann plate with GRIN rod lenses;Chinese adaptive astronomical telescope. The session on waveguide and diffractive optics and microlithography comprises papers on the fabrication of ion-exchanged glass channel waveguides with etched and diffused grating taps;modular fiber optic assembly technique;forward photorefractive multibeam mixing in BaTiO3;correcting chromatic aberration in holographic optical systems. Miscellaneous topics include articles on optomechanical properties of PMMA and their applications in pressure sensors and on a Fabry-Perot tunable filter for visible and near IR using nematic liquid crystals.

关键词： optical Systems

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