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

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PROPAGATION METHODS FOR THE ANALYSIS OF BISTABLE DEVICES AND SPATIAL LIGHT MODULATORS BASED ON NONLINEAR MOLECULAR MEDIA

PROPAGATION METHODS FOR THE ANALYSIS OF BISTABLE DEVICES AND...

引用

Conference on current developments in optical design and optical engineering iii

作者： SPEISER, S GROSWASSER, D ORENSTEIN, M TECHNION ISRAEL INST TECHNOL DEPT CHEMIL-32000 HAIFAISRAEL

ISBN: (纸本)081941249X

We already discussed the bistable behavior of a Fabry Perot resonator filled with molecular media as well as the characteristics of a spatial light modulator (SLM) based on the nonlinearity induced by excited state absorption. In the present paper we present two practical configurations. First we analyze a cavity-less bistable element which removes some of the realization problems related to high finess cavity. In this configuration the nonlinear medium is located in one arm of an optical interferometer. The scheme provides the required amount of positive feedback by the bistable mechanism -- but without a cavity. We applied the nonlinear eikonal approximation, a method which takes care of the detailed propagation effects, and obtained conditions for bistability, as well as optimizing the design parameters such as the output mirror reflectivity, etc.

关键词： optical fibers Nonlinear optics Spatial light modulators Bistability Interferometers Mirrors Absorption Reflectivity Beam propagation method Resonators

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New infrared optical systems using diffractive optics

New infrared optical systems using diffractive optics

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Conference on current developments in Lens design and optical engineering iii

作者： Bigwood, C Thales Opt Ltd St Asaph LL17 0LL Denbigh Wales

ISBN: (纸本)0819445347

A method for computing the polychromatic MTF of hybrid refractive - diffractive elements is described taking into consideration the effects of not only the primary diffraction order but also the effects of additional parasitic diffraction orders. The results of this approach are compared with the more conventional single order calculation and with actual measured performance. For certain markets and applications the cost of infrared lenses are critical in order to achieve customer expectations. Two possible methods of realising this requirement are the use of moulded optics or the use of multiple kinoform optics with no refractive power. Examples of such lenses are given along with discussion of the merits and limitations that each approach entails.

关键词： optical design infrared diffractive optics

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optical design ANALYSIS INCORPORATING ACTUAL SYSTEM INTERFEROMETRIC DATA

OPTICAL DESIGN ANALYSIS INCORPORATING ACTUAL SYSTEM INTERFER...

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CONF ON current developments IN optical engineering AND COMMERCIAL OPTICS

作者： WILLEY, G PATCHIN, R CAI a Division of RECON/OPTICAL INC. (United States)

ISBN: (纸本)0819402044

Interferometric measurements of real surfaces are combined with computed optical design analyses. To accomplish this, a special software interface driver was developed to accept serial optical Path Difference (OPD) data from a Zygo Mark iii interferometer, apply standard algorithms, and convert the measured data into a CODE V readable file. Analysis was conducted on a large aperture developmental optical system containing a fold mirror of eggcrate construction. MTF performance of the entire system was computed as were the contributions of individual surfaces to overall optical quality. Diffraction effects due to the rib structure of the eggcrate mirror were apparent in this analysis, as were the effects of gravity and figure components of the wavefront. This hybrid analysis demonstrates the usefulness of coupling interferometry with an optical design program in the analysis of complex optical systems.

关键词： Mirrors Modulation transfer functions Wavefronts Diffraction Interferometry Code v Computing systems optical engineering Data modeling Error analysis

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SOLID MODELING OF optical-COMPONENTS AND RAY-TRACING

SOLID MODELING OF OPTICAL-COMPONENTS AND RAY-TRACING

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Conference on current developments in optical design and optical engineering iii

作者： FINKLER, R OPTRAM LTD IL-43106 RAANANAISRAEL

ISBN: (纸本)081941249X

optical systems are traditionally represented by a sequential series of `optical surfaces' that are ordered in the same manner experienced by light traveling from an object to an image point through the system. The actual system is composed of 3-D components which include these `active optical surfaces' as the external surface of the component. Modern simulation technology is based on solid modeling which provides a very close representation to the actual system and enables computer integrated manufacturing by being accurate and comprehensive enough for fabrication. The classical method to analyze an optical system is based on ray tracing, a technique based on geometrical optics where light propagation is assumed to be simulated by rays from the object to the image point. Each ray is represented by a linear vector traveling through the system to the evaluation plane by iterations. Each step calculates the propagation between two successive surfaces in a sequential order. The shift from `sequential surfaces' representation to `solid models,' which changes the classical method of ray tracing, but offers a variety of new analytical opportunities, is discussed.

关键词： Ray tracing Solids Geometrical optics Optics manufacturing Solid modeling optical components 3D modeling Data modeling Systems modeling Visualization

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design of a dual field-of-view optical system for infra-red focal-plane arrays

Design of a dual field-of-view optical system for infra-red ...

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Conference on current developments in Lens design and optical engineering iii

作者： Akram, MN Royal Inst Technol Dept Microelect & Informat Technol SE-16440 Stockholm Sweden

ISBN: (纸本)0819445347

In this paper, the design of a dual field-of-view optical system for 3-5 mum infra-red focal-plane arrays is described. Preliminary calculations are done to determine the first-order parameters of the narrow and the wide-field modes. To achieve a switchable dual field-of-view system, two different optical configurations, one based on the axial motion of a lens group and the other based on a rotate-in motion of two separated lens groups, are studied and compared. Diffractive and conic surfaces are used to control the color and the monochromatic aberrations with less number of total lenses used. Paraxial and real-ray modelling of the Narcissus effect is described. It is shown that the rotate-in scheme achieves better optical performance in both the narrow and the wide-field modes. The axial-motion scheme suffers from poor lateral color in the wide-angle mode. The final optical designs along with their aberrations curves and MTF plots are presented showing excellent performance.

关键词： lens design infrared optics diffractive optics dual field-of-view focal-plane-arrays (FPA)

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design of low jitter sensitive beam expander 3

Design of low jitter sensitive beam expander

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current developments in optical engineering iii 1988

作者： Shen, Gon-Yen Perkin-Elmer Corporation 100 Wooster Heights Road DanburyCT06810 United States

Beam expander optical and structural characteristics can be utilized to desensitize line of sight (LOS) jitter. The overall LOS jitter for a given disturbance spectrum is largely dependent on the optical alignment sensitivity and the resonance mode shapes of the beam expander. By properly selecting the beam expander configuration design, "nodes" can be generated in terms of the LOS where no, or minimum, participation can be expected for certain frequency bands. By adopting such a design approach, the overall LOS jitter for a given disturbance can be reduced significantly. © 1989 SPIE. All rights reserved.

关键词： Jitter

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design considerations for a compact infrared airborne imager to meet alignment and assembly requirements

Design considerations for a compact infrared airborne imager...

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Conference on current developments in Lens design and optical engineering iii

作者： Spencer, HM DRS Sensor Syst Torrance CA USA

ISBN: (纸本)0819445347

Helicopter mounted optical systems require compact packaging, good image performance (approaching the diffraction-limit), and must survive and operate in a rugged shock and thermal environment. The always-present requirement for low weight in an airborne sensor is paramount when considering the optical configuration. In addition, the usual list of optical requirements which must be satisfied within narrow tolerances, including field-of-view, vignetting, boresight, stray light rejection, and transmittance drive the optical design. It must be determined early in the engineering process which internal optical alignment adjustment provisions must be included, which may be included, and which will have to be omitted, since adding alignment features often conflicts with the requirement for optical component stability during operation and of course adds weight. When the system is to be modular and mates with another optical system, a telescope designed by different contractor in this case, additional alignment requirements between the two systems must be specified and agreed upon. Final delivered cost is certainly critical and "touch labor" assembly time must be determined and controlled. A clear plan for the alignment and assembly steps must be devised before the optical design can even begin to ensure that an arrangement of optical components amenable to adjustment is reached. The optical specification document should be written contemporaneously with the alignment plan to insure compatibility. The optics decisions that led to the success of this project are described and the final optical design is presented. A description of some unique pupil alignment adjustments, never performed by us in the infrared, is described.

关键词： Imaging systems Telescopes Sensors optical alignment Scanners Infrared radiation Objectives optical design Tolerancing Infrared imaging

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Mechanical design of a multielement lens system for space applications

Mechanical design of a multielement lens system for space ap...

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current developments in optical engineering iii 1988

作者： Gupta, R.K. Babu, N.J. Murthy, T.K. ISRO Satellite Centre Bangalore560017 India

The major problems faced in spaceborne multielement optical systems used for high resolution imagery and remote sensing applications are the stability of optical and mechanical configurations under Shock, Vibration and Thermal cycling environments. The critical parameters to be achieved in a housing design for such situations are the decentering limits and separation limits for temperature variations. In this paper, a new technique for mounting optical elements for such applications is discussed. © 1989 SPIE. All rights reserved.

关键词： Space applications

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Dynamic study of a Varioptic variable focal lens

Dynamic study of a Varioptic variable focal lens

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Conference on current developments in Lens design and optical engineering iii

作者： Gabay, C Berge, B Dovillaire, G Bucourt, S Ecole Normale Super Lyon F-69007 Lyon France

ISBN: (纸本)0819445347

We present real-time measurements of the wave front distortion induced by a variable focal lens. This lens, called Varioptic, is made of a transparent cell filled with twin liquids. We submit a 4.5mm in diameter lens upon a 110V voltage step inducing a optical power shift of about 25 dioptries (m(-1)). Characteristic response time is shown to be of the order of a few 1/100s, the lens recovering its full quality after 5/100s. We present a scaling analysis of this response time versus lens size.

关键词： Wavefronts Liquids Interfaces Wavefront distortions Spherical lenses CCD image sensors optical fibers Prototyping Solids Liquid crystals

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design of an optical input device for use by the visually-impaired

Design of an optical input device for use by the visually-im...

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current developments in optical engineering iii 1988

作者： Kipman, Yair 185 Albany Street CambridgeMA02139 United States

This paper describes the optical hand-held scanner designed for use as an input device to the Kurzweil reading machine for the blind and visually-impaired. This device has numerous advantages over other scanners, chief among which are its high resolution, one-inch field of view, bidirectional capabilities, and compact block-shape. The device allows the user to scan single sheets as well as bound books and magazines. During its three-year development, the major emphasis has been on refining the design to make the device easy to use. This paper addresses the technical issues associated with the human-factors considerations that led us to this design. © 1989 SPIE. All rights reserved.

关键词： Scanning

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