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检索条件"任意字段=Conference on Current Developments in Optical Design and Engineering V"

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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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optical design and analysis of a polarimeter for space applications

Optical design and analysis of a polarimeter for space appli...

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conference on current developments in Lens design and optical engineering v

作者： Deslis, A Petroy, S Kampe, T Ball Aerosp & Technol Corp Boulder CO 80301 USA

ISBN: (纸本)0819454613

Satellite-based remote sensing offers the best opportunity for studying the properties of atmospheric aerosols and their radiative effects on the global scale over extended periods Tropospheric aerosols represent the largest uncertainty in predicting the radiative forcing of climate (IPCC, 2001). A key question is whether atmospheric aerosols contribute to warming or cool the climate system. Since the sign of direct radiative forcing is controlled by the ability of aerosol particles to absorb light, the information on the single scattering albedo of different aerosol types and its variations with aerosol lifecycles is clearly very desirable. Furthermore, the wavelength-dependent values of single scattering albedo from the Uv to IR are important in retrieving aerosol optical depth from satellites passive remote sensing and for climate modeling. We describe the design of a space-borne polarimeter that was derived from the key science requirements. The performance of this candidate polarimeter, operating in the Uv/vIS/NIR spectral regions, is described. The optical design form and various optical performance parameters, including transmittance calculations of the polarimeter's spectral channels showing the "leakage" of polarization states, as well as the degree of polarization as function of wavelength and field of view are presented for the various wavelength regions. An overview of the instrument performance and driving operational parameters is presented.

关键词： polarimeter optical design atmospheric aerosols polarization

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design and realization of an innovative mount for calcium fluoride space optics

Design and realization of an innovative mount for calcium fl...

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conference on current developments in Lens design and optical engineering v

作者： Torrington, GK Clingan, DE Baker, RBM Montoya, MM Macke, BT Sandia Natl Labs Albuquerque NM 87185 USA

ISBN: (纸本)0819454613

Calcium fluoride is a desirable material for optical design of space systems in the ultraviolet, visible, and infrared bands. Modem calcium fluoride materials fabricated for the photolithography industry are highly resistant to space radiation. The wide wavelength band and low dispersion are also desirable properties. Unfortunately, calcium fluoride has a host of significant material property issues which hinder its use in the space environment. Low hardness, susceptibility to thermal and mechanical shock, and large coefficient of thermal expansion present significant challenges during development of opto-mechanical designs. Sandia National Laboratories Monitoring Systems and Technology Center has fielded a calcium fluoride based optical system for use in space. The Sandia design solution is based upon a spring-loaded mount which uses no volatile organic compounds. The theory of the Sandia solution is developed and design rules are presented. The Sandia design solution is illustrated for a specific example. Example design and margin calculations are shown. Finally, lessons learned from our design realization and qualification testing efforts are shared for the benefit of the community.

关键词： calcium fluoride space lens mount spring

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Including detector effects in the design of wide-field imaging systems

Including detector effects in the design of wide-field imagi...

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conference on current developments in Lens design and optical engineering v

作者： Harvey, JE Atanassova, M Krywonos, A Univ Cent Florida CREOL Orlando FL 32826 USA

ISBN: (纸本)0819454613

Most imaging systems today include a mosaic detector array in the focal plane. optical designers of astronomical telescopes typically produce a design that yields a superb on-axis aerial image in the focal plane, and detector effects are included only in the analysis of the final system performance. Aplanatic optical designs (corrected for spherical aberration and coma) are widely considered to be superior to non-aplanatic designs. However, there is little merit in an aplanatic design for wide-field applications because one needs to optimize some field-weighted-average measure of resolution over the desired operational field-of-view (OFOv). Furthermore, when used with a mosaic detector array in the focal plane, detector effects eliminate the advantage of the aplanatic design even at small field angles. For wide fields-of-view, the focal plane is frequently despaced to balance field curvature with defocus thus obtaining better overall performance. We will demonstrate that including detector effects in the design process results in a different optimal (non-aplanatic) design for each OFOv that is even superior to an optimally despaced aplanatic design.

关键词： detector effects wide-field imaging systems grazing incidence X-ray telescopes

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The orbiting carbon observatory (OCO) instrument optical design

The orbiting carbon observatory (OCO) instrument optical des...

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conference on current developments in Lens design and optical engineering v

作者： Haring, R Pollock, R Sutin, B Crisp, D Hamilton Sundstrand Pomona CA 91701 USA

ISBN: (纸本)0819454613

The Orbiting Carbon Observatory (OCO) will measure the distribution of total column carbon dioxide in the Earth's atmosphere from an Earth-orbiting satellite. Three high-resolution grating spectrometers measure two CO2 bands centered at 1.61 and 2.06 mum and the oxygen A-band centered at 0.76 mum in the near infrared region of the spectrum. This paper presents the optical design and highlights the critical optical requirements flowed down from the scientific requirements. These requirements necessitate a focal ratio of f/1.9, a spectral resolution of 20,000, and precedence-setting requirements for polarization stability and the instrument line shape function. The solution encompasses three grating spectrometers that are patterned after a simple refractive spectrometer approach consisting of an entrance slit, a two-element collimator, a planar reflection grating, and a two-element camera lens. Each spectrometer shares a common field of view through a single all-reflective telescope. The light is then re-collimated and passed through a relay system, separating the three bands before re-imaging the scene onto each of the spectrometer entrance slits using an all-reflective inverse Newtonian re-imager.

关键词： infrared spectrometer greenhouse gases carbon dioxide oxygen A-band

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Avoiding unstable regions in the design space of EUv mirror systems comprising high-order aspheric surfaces

Avoiding unstable regions in the design space of EUV mirror ...

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conference on current developments in Lens design and optical engineering v

作者： Marinescu, O Bociort, F Braat, J Delft Univ Technol Opt Res Grp NL-2628 CJ Delft Netherlands

ISBN: (纸本)0819454613

When Extreme Ultraviolet mirror systems having several high-order aspheric surfaces are optimized, the configurations often enter into highly unstable regions of the parameter space. Small changes of system parameters lead then to large changes in ray paths, and therefore optimization algorithms crash because certain assumptions upon which they are based become invalid. We describe a technique that keeps the configuration away from the unstable regions. The central component of our technique is a finite-aberration quantity, the so-called quasi-invariant, which has been originally introduced by H. A. Buchdahl. The quasi-invariant is computed for several rays in the system, and its average change per surface is determined for all surfaces. Small values of these average changes indicate stability. The stabilization technique consists of two steps: First, we obtain a stable initial configuration for subsequent optimization by choosing the system parameters such that the quasi-invariant change per surface is minimal. Then, if the average changes per surfaces of the quasi-invariant remain small during optimization, the configuration is kept in the safe region of the parameter space. This technique is applicable for arbitrary rotationally symmetric optical systems. Examples from the design of aspheric mirror systems for EUv lithography will be given.

关键词： mirror systems aspheres EUv lithography optimization relaxation

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Proceedings of SPIE - The International Society for optical engineering - current developments in Lens design and optical engineering

Proceedings of SPIE - The International Society for Optical ...

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current developments in Lens design and optical engineering v

The proceedings contain 40 papers from the Proceedings of SPIE - current developments in Lens design and optical engineering v. The topics discussed include: small catadioptric microscope optics;visible-NIR imaging optics for a Fourier transform spectrometer;optical design and analysis of a polarimeter for space applications;novel faceted mirror for pushbroom IR sensor;variable-focus liquid lens for portable applications;improving efficiency of beam splitter for DvD pickup;near infrared (NIR) achromatic phase retarder;passive fiber chip coupling of polymer PLC devices using hot embossing technique;optical state estimation using wavefront data;and temporal stability and performance of MR polishing fluid.

关键词： optical design

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The design of microscopic system using zoom structure with a fixed magnification and the independency on the variation of object distance

The design of microscopic system using zoom structure with a...

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conference on current developments in Lens design and optical engineering v

作者： Ryu, JM Jo, JH Jung, JH Chun, YS Kang, GM Hannam Univ Sch Nat Sci Taejon 306791 South Korea

ISBN: (纸本)0819454613

The multi-configurative microscopic system for inspecting the wire-bonding of reed frame is designed. Object rays is nearly collimated by a objective lens group which is a common lens group of x2 and x6 imaging lens systems and is splitted by two beam-splitters composed of a penta-prism and a refracting prism. And object rays started from the central region and the boundary region(reed frame region) on semiconductor chip(that is, the object) are imaged at the two different imaging planes by x2 and x6 imaging lens groups, respectively. The x6 imaging lens system with a constant object distance and a constant magnification is well designed by general imaging optics system design method. However, since the depth of wire structure on the reed frame has about +/-3 mm, in order to observe by a constant magnification and at a fixed imaging plane without the dependency on the variation of objective distance generated by the depth of wire structure on the reed frame, the imaging lens system is composed of two separated groups, which should be moved along nonlinear locus like mechanically compensated zoom lenses. The nonlinear equations for zoom locus are derived by using the Gaussian bracket. Refraction powers and positions of each groups are numerically determined by solving the equations, and initial design data for each groups is obtained by using Seidel third order aberration theory. The optimization technique is finally utilized to obtain this multi-configurative microscopic system.

关键词： lens design equivalent lens imaging system microscopic system multi-configurative system

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Recent development of Precessions polishing for larger components and free-form surfaces

Recent development of <i>Precessions</i> polishing for large...

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conference on current developments in Lens design and optical engineering v

作者： Walker, DD Beaucamp, ATH Brooks, D Doubrovski, v Cassie, M Dunn, C Freeman, R King, A Libert, M McCavana, G Morton, R Riley, D Simms, J UCL Dept Phys & Astron Opt Sci Lab London WC1E 6BT England

ISBN: (纸本)0819454613

Since the 2003 Annual Meeting, the Precessions process has become accepted as an efficient method for polishing and figuring moderate-sized axially-symmetric aspheric parts in industry. In this paper, we report on some very significant new advances beyond this capability. The first is the demonstration of the process on substantially larger diameter parts than worked hitherto - in particular, a precision-ground 500 mm diameter deeply-concave aspheric mirror. We describe the consequences of polishing large parts with the axis of the part vertical, in contrast to the horizontal axis of the smaller machines. Issues include slurry puddling and settlement in concave forms, process-uniformity, adequate support of the part and handling. We then report on recent work developing the Precessions process for non axially-symmetric surfaces including free-form. The correct relationship of the process with metrology has proved to be complex on several fronts, one example being differing descriptions of form either along a surface or its projection. We present our experience using profilometry and interferometry on precision-ground and polished surfaces, and in achieving absolute form with known base radius. Finally, we remark on the potential power of a priori predictions of achievable surface quality when optimizing optical system designs.

关键词： Polishing

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Methods for rapid evaluation of the stray light in optical systems

Methods for rapid evaluation of the stray light in optical s...

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conference on optical design and engineering

作者： Perrin, JC JCPC F-71640 Mellecey France

ISBN: (纸本)0819451339

Quantitative analysis of stray light in optical system is often a burden for optical designers. Ghost images due to multiple reflections on the surfaces of lenses and mirrors must be minimized during the design and optimization phases. Stray light in general must be controlled also during the optomechanical drawings. Already presented at the ICSO 2000 conference (Ref 1), the CODE v macro software PARASIT makes it possible to have a complete quantitative analysis of the ghost in a few minutes. The possibilities of PARASIT are summarized with emphasis given to recent developments and comparison are given with LightTools. To make a full evaluation of the stray light in general, the possibilities of LightTools, MATLAB and EXCEL interacting together using the Microsoft Active X protocol are unbeatable, as long as methods and corresponding macros written in EXCEL vBA and MATLAB in are at the disposal of the optical designer. A short overview of these possibilities are demonstrated in this paper.

关键词： Stray light MATLAB Excel Code v optical design Reflection Quantitative analysis Interfaces Ray tracing Stray light analysis

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