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

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design and testing of a refractive reshaping system

Design and testing of a refractive reshaping system

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current developments in optical design and optical engineering iiI

作者： Jiang, Wu Shealy, David L. Martin, James C. Univ. of Alabama/Birmingham Birmingham AL USA

ISBN: (纸本)081941249X

For many illumination applications, it is desirable for a laser beam to have a uniform irradiance distribution across its diameter. Refractive and reflective systems for reshaping a laser beam profile have been proposed and discussed for many years. One of the refractive systems consisting of two plano-aspherical lenses operates with high efficiency. Recently, a prototype of this two aspherical lens reshaping system has been made from CaF2. The performance of the prototype is presented in this paper. The optical design and analysis of this system also are discussed.

关键词： Laser beams

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design of a novel field-portable fluorescence spectrophotometer

Design of a novel field-portable fluorescence spectrophotome...

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current developments in optical design and optical engineering iiI

作者： Qing, Mao F. No. 3 Analytical Instrument Factory Shanghai China

ISBN: (纸本)081941249X

The two monochromators of this instrument (excitation monochromator and emission monochromator) have been designed with a specific optical system which has higher transfer energy. All the parts of this instrument have been placed in the inverse plane (33 × 21.5 cm), which makes the instrument compact and installment easy. The design also provides a novel idea to solve the contradiction between system energy and limited power, it only takes a little power to complete most of the fluorescence analyses. An internal microprocessor utilizes chemometric analysis techniques to determine the concentrations of target analyses in a complex chemical matrix. Typical analysis techniques include multivariate linear regression and principal components analysis.

关键词： Spectrophotometers

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LARGE optical-SYSTEM design INTEGRATING ACTIVE optical AND STRUCTURAL CONTROL II

LARGE OPTICAL-SYSTEM DESIGN INTEGRATING ACTIVE OPTICAL AND S...

引用

1993 SMART STRUCTURES AND MATERIALS : ACTIVE AND ADAPTIVE optical COMPONENTS AND SYSTEMS 2

作者： CROWE, D GIGLIO, F Eastman Kodak Co. (United States)

ISBN: (纸本)0819411531

designs for large lightweight spaceborne optical systems are evolving to configurations that utilize segmented apertures. optical quality and stability requirements for these systems are in general more stringent than today's best telescopes. These two factors require the use of high precision active control systems to correct and maintain optical performance. The Eastman Kodak Company is in the process of developing the technologies required to demonstrate that such systems are feasible. The chosen approach utilizes a structural control system to minimize high bandwidth disturbances and a low bandwidth optical control system to correct and maintain the optical quality of the telescope. An overview of this approach and a description of current progress is discussed.

关键词： Sensors Actuators Control systems Telescopes Mirrors Wavefronts Phase modulation optical components optical fabrication Scanning tunneling microscopy

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Modeling of diffractive optical elements for lens design

Modeling of diffractive optical elements for lens design

引用

current developments in optical design and optical engineering iiI

作者： Rayces, Juan L. Lebich, Lan OCA Applied Optics Inc. Laguna Niguel CA USA

ISBN: (纸本)081941249X

The use of a standard aspheric profile to describe conventional optical elements in lens design programs has advantages such as independent verification of lens system performance by different individuals, ease of interpretation by different manufacturers, etc. A model of diffractive optical element is proposed for consideration as a standard form to have similar benefits. Diffractive elements are characterized here by (1) the equation of the supporting surface (substrate), and (2) the phase function. The phase function itself consists of two terms: (a) the stigmatic phase term, and (b) the astigmatic phase term. The stigmatic phase term is a rotationally symmetric function and is related to the property of the diffraction element to image free from aberration one axial point onto another, as in holograms, at a specific (reference) wavelength. The astigmatic phase term is an arbitrary function of the space coordinates, it takes several forms: it can impart aspheric deformations (or corrections) to incident wave fronts or it can be used to model different types of gratings.

关键词： Lenses

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Automated testing of visual instruments and the problem of best focus

Automated testing of visual instruments and the problem of b...

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current developments in optical design and optical engineering iiI

作者： Mouroulis, Pantazis Z. Cheng, Xiaoxue Lyons, Kevin P. Rochester Inst. of Technology Rochester NY USA

ISBN: (纸本)081941249X

We discuss the problem of how to determine the optimum focus during MTF or similar observerless testing of visual instruments. We review the literature to show that the most commonly employed method, maximization of the response at a single spatial frequency, can lead to very large errors in predicting the visual quality of an instrument. We propose alternative criteria, and examine their behavior through focus and in the presence of aberrations. current data support the assertion that an appropriately defined radius of encircled energy, or an averaged MTF integral, are the best candidates to serve both as general image quality criteria and as a means for determining the optimum focus. We conclude by proposing an experiment that should resolve any remaining questions.

关键词： optical instruments

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RECENT developments IN STEPPER FOCUS AND OVERLAY CONTROL METROLOGY FOR SUB-HALF-MICRON MANUFACTURING APPLICATIONS 7

RECENT DEVELOPMENTS IN STEPPER FOCUS AND OVERLAY CONTROL MET...

引用

7TH ANNUAL CONF ON INTEGRATED CIRCUIT METROLOGY, INSPECTION, AND PROCESS CONTROL

作者： HOLLMAN, RF BISCHOFF, PM HELLEBREKERS, PP GCA a Unit of General Signal (United States)

ISBN: (纸本)0819411604

current generation of advanced IC's require sub-half-micron-resolution photolithography over large exposure fields, with device overlay tolerances of less than 100 nanometers. Achieving this performance in high-volume manufacturing will challenge the focus and overlay control capabilities of optical reduction steppers. This paper presents new metrological approaches to achieving the required focus and overlay control performance. A latent image focus measurement technique is described, which has been used extensively to characterize die levelling performance. To improve overlay capability on back end levels (especially metal), a combined bright field/dark field alignment system has been developed. Data on alignment performance, and optimization of alignment mark design for bright field, will be presented.

关键词： optical alignment Overlay metrology Semiconducting wafers Control systems Metals Metrology Tolerancing Error analysis Manufacturing Signal detection

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LOW-VOLTAGE SELECT DEFORMABLE MIRRORS II

LOW-VOLTAGE SELECT DEFORMABLE MIRRORS

引用

1993 SMART STRUCTURES AND MATERIALS : ACTIVE AND ADAPTIVE optical COMPONENTS AND SYSTEMS 2

作者： EALEY, MA Litton Itek Optical Systems (United States)

ISBN: (纸本)0819411531

The low voltage SELECT deformable mirror described herein provides sub-nanometer control of the optical wavefront and represents the culmination of 10 years of development. Due to the maturity of the PMN electrostrictive actuator technology, the mirror operating voltage has decreased from 3000 volts to 100 volts, the hysteresis has been reduced from near 20% to less than 1%, and the response uniformity is better than 3% over the entire actuator population. But more importantly, the deformable mirrors built today are unparalleled in terms of performance and reliability, even after millions of operational cycles. This paper will summarizes the actuator process developments and discuss the design features and measured performance of the low voltage SELECT deformable mirror family. In fact as the results will show, the SELECT DM's are not only good deformable mirrors, but are also among the most precise optics ever made, especially when operated under active control.

关键词： Actuators Deformable mirrors Mirrors Control systems Polishing Wavefronts Adhesives Glasses Reliability Adaptive optics

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current laser guide-star adaptive optics systems and concepts for the future

Current laser guide-star adaptive optics systems and concept...

引用

Lens and optical Systems design 1992

作者： Ellerbroek, Brent L. Fugate, Robert Q. Spinhirne, James M. Starfire Optical Range PL /LITE KAFBNM87117 United States Rockwell Power Systems AlbuquerqueNM United States

ISBN: (纸本)9780819409591

Laser guide star (LGS) adaptive optics systems can dramatically improve the resolution of ground-based astronomical telescopes but introduce a variety of novel optical engineering requirements. We describe how these requirements have been addressed in the Starfire optical Range (SOR) Gen ii adaptive optics system and review sample experimental results illustrating the degree of atmospheric turbulence compensation achieved with natural and laser guide stars. Although adequate for a 1.5 m aperture diameter telescope, the level of compensation possible with a single low altitude LGS is limited by anisoplanatism and will not be adequate for larger aperture telescopes operating at visible wavelengths. We evaluate these limitations numerically for a sample problem involving a four meter aperture diameter telescope and estimate the performance improvements possible through the use of mesospheric sodium guide stars, multiple guide stars, and multiple deformable mirrors. Implementing these advanced concepts introduces new challenges in the areas of laser guide star generation, wavefront sensing, and beam train optical design. © (1992) 2017 SPIE.

关键词： optical design

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System performance analysis for COSTAR design

System performance analysis for COSTAR design

引用

Space Astronomical Telescopes and Instruments ii

作者： Lightsey, Paul A. Gerber, John D. Kaplan, Michael L. Teusch, Dennis A. Ball Aerospace and Communications Group Boulder CO USA

ISBN: (纸本)0819411817

The Corrective Optics Space Telescope Axial Replacement (COSTAR) instrument is designed to provide optical correction for the current figure error in the Hubble Space Telescope (HST) primary mirror to three of the first generation instruments: Faint Object Camera (FOC), Faint Object Spectrometer (FOS), and the Goddard High Resolution Spectrometer. The FOC and FOS each have two optical channels and the GHRS one optical channel that are corrected. The optical correction is achieved by deploying a two mirror relay into the HST hub area in front of the optical Telescope Assembly (OTA) focal surface for each optical channel. Structural motion of the mirror support system will affect alignment producing changes in wave front error (wfe) and line-of-sight (los). Changes of los during an exposure will blur the image and degrade image quality in addition to alignment degradation of wfe. The system analyses used to perform image quality trades and allocate budgets in the design phase and to help define requirements for the integration and test phase will be presented. These analyses were an integrated and iterative process among the optical, structural, and thermal analysis disciplines. Results of these analyses predict COSTAR performance will meet the image quality requirements.

关键词： Airborne telescopes

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Recent developments for the AXAF CCD imaging spectrometer

Recent developments for the AXAF CCD imaging spectrometer

引用

EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy IV

作者： Lumb, David H. Bautz, Mark W. Burrows, David N. Doty, John P. Garmire, Gordon P. Gray, P. Nousek, John A. Ricker, George R. The Pennsylvania State Univ. University Park PA USA

ISBN: (纸本)0819412554

The recent restructuring of the AXAF program has necessitated a review of the design of the ACIS instrument. In this paper we report on the current status of these design activities. We concentrate on changes to the baseline CCD and its impact on aspects such as the operating modes. Also we review changes to the mechanical design with respect to the passive cooling scheme facilitated by the change to a highly eccentric deep earth orbit.

关键词： Astronomy

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