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optical performance budget for the Far Ultraviolet Spectroscopic Explorer 6

Optical performance budget for the Far Ultraviolet Spectrosc...

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current developments in optical design and engineering VI Conference

作者： Sahnow, DJ VanDyke, CM Gong, Q Bremer, J Kennedy, MJ Johns Hopkins Univ. (United States) Swales and Associates Inc. (United States)

ISBN: (纸本)0819422517

The Far Ultraviolet Spectroscopic Explorer (FUSE) satellite will make high spectral resolution (lambda/Delta lambda = 30,000) measurements in the 905-1195 Angstrom bandpass from low-earth orbit. The optical system of the instrument consists of four coaligned telescopes and gratings, which disperse their spectra onto two detectors;both the mirrors and slit assemblies will be adjustable in flight. Because of this complicated, coupled optical system, it is important to understand all of the effects which may affect performance. The ability of the FUSE instrument to maintain its high resolving power and effective area is dependent on many factors, including the optical design, manufacturing errors, the ability to coalign the system on orbit, and the stability of the structure holding the optical elements. In order to predict the on-orbit performance, a detailed optical performance budget has been developed. This budget includes all effects which affect the resolution and throughput. Included are shea term effects (such as the stability of the metering structure due to thermal variations during a single orbit);long term effects (such as moisture desorption from the graphite/cyanate ester structure and gravity release);and installation tolerances.

关键词： error budgets FUSE spectroscopy tolerance analysis

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A new design to measure the absolute spectral reflectivity 6

A new design to measure the absolute spectral reflectivity

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current developments in optical design and engineering VI Conference

作者： Chen, LY Su, Y Ma, HZ Zhou, SM Wang, Y Qian, YH Physics Department Fudan University Shanghai 200433 China

ISBN: (纸本)0819422517

A new type of the normal incidence scanning reflectometer has been designed and constructed. In the system design, instead of using a reference reflective sample or adjusting the optical path as did in the traditional design, we use a fixed M-type fused quartz prism to split the incidence light source beam into two ones by a total internal reflection configuration. Therefore, these two light beams have the same spot sizes, intensities and spectral response. One beam goes directly to the detector and is used as the incidence reference beam. The second sampling beam goes to the sample first, and then is reflected by the sample with the beam intensity measured finally by the same detector. A metal disk with three holes is driven precisely by a stepping motor and is used to control the reference beam, reflection beam and background signals to be measured in sequence. Afterwards, the absolute reflectivity of the sample at the certain wavelength can be determined immediately by the computer through calculating those three signals. The system is controlled automatically by the computer and worked in a wavelength range from 400 to 800nm under a 5-degree nearly normal incidence angle condition. In the paper, the details of the system design, optical element configuration and error reduction are given and discussed. The measured reflective spectral results for testing samples are also given and shown in good agreement with those measured by other optical method. The system designed in this work, however, is simpler and more reliable to be used in many optical measurements of the sample.

关键词： spectroscopy reflectivity optics

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Study on 3.39 mu m laser beam attenuator 6

Study on 3.39 mu m laser beam attenuator

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current developments in optical design and engineering VI Conference

作者： Xu, FY Chi, ZT Department of Basic Courses Shandong Architectural Engineering Institute JinanShandong 250014 China Department of Physics Qingdao University Qingdao Shandong 266071 China

ISBN: (纸本)0819422517

Light beam attenuator is one kind of optical element which has been widely used in optical technique. According to beam attenuation principle, it can be divided into two kinds, one is absorbing type attenuator, the other is non-absorbing type attenuator. There has been considerable attention paid to study visible attenuator, but there are few ways to attenuate 3.39 mu m laser beam. In this article we have introduced a series new type 3.39 mu m laser beam attenuator made by suing birefringent crystal. Some is absorbing type attenuator. the other is non-absorbing type attenuator. Such as: two calcite parallel plates type,two yttrium orthovanadate prism type, two yttrium orthovanadate parallel plates plus lambda/2 waveplate type etc.

关键词： attenuator birefringent crystal waveplate prism parallel beamsplitter

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Mirror mount performance for the COSTAR and STIS programs 6

Mirror mount performance for the COSTAR and STIS programs

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current developments in optical design and engineering VI 1996

作者： Cahill, Ray Ball Aerospace and Technologies Corporation BoulderCO United States

This paper describes the process used to verify that the mounts designed for the STIS and COSTAR program would perform as designed. The optics on these two programs were all fabricated to λ/100 rms surface figure. Some of the optics were bonded into mounts and others were mechanically mounted. All the mounts were designed to impart less than 0.005 X rms additional distortion with a goal of 0.003 λ rms. A series of tests showed that the mounts performed as designed. Stability, thermal performance, contamination, and survivability were also tested. © SPIE.

关键词： optical testing

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Thermal Infrared Radiometer scan mirror optical performance 6

Thermal Infrared Radiometer scan mirror optical performance

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current developments in optical design and engineering VI 1996

作者： Roybal, Eloy A. Bill Hackman, Michael T. Kincade, John M. Ball Aerospace and Technologies Corporation PO Box 1062 BoulderCO80302 United States Tinsley Laboratories Inc. 3900 Lakeside Drive RichmondCA94806 United States

The optical design, test, and fabrication of a large ultra lightweight flat beryllium scan mirror is reported. The mirror is a key component for the (TIR) Thermal Infiared Radiometer instrument which is scheduled to compliment the (EOS) Earth Observation Satellite program. The unique optical design properties of the minor provide state of the art performance for scan operations and thermal imaging of the earth's surface in the 8.0 to 12.0 micron wavelength range. The mirror's optomechanical design provides a very stable non-deformed platform for the scan drive system. The mirror's optical figure, surface characteristics and protected gold coating have been tested and are well within the flight specifications. © SPIE.

关键词： Radiometers

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New optical mountings of the spectral devices with concave diffraction gratings and high entrance slit. 6

New optical mountings of the spectral devices with concave d...

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current developments in optical design and engineering VI Conference

作者： Sokolova, E Cortes, SDAR Univ. da Beira Interior (Netherlands) Univ. da Beira Interior (Portugal)

ISBN: (纸本)0819422517

The concave diffraction grating is both the dispersive and the focusing element at the same time. It can be the only optical unit of monochromator or polychromator. Using the concave diffraction gratings with nonequidistant and curved grooves gives the possibility for correction of the aberrations in the useful region of spectrum and provide the devices with determined focal surfaces. To increase the height of the entrance slit of the spectroscopic device we have to eliminate the first and the second - order astigmatism aberrations. Consideration of this type of aberration is very important now in view of the new types of spectral devices using fibre optics and multielement detectors being developed. These new elements allow us to register the spectrum of extended objects or a number of spectrums simultaneously. For the case of the double monochromator we noticed, that the second - order astigmatism can be completely eliminated if the second part of the double monochromator is equivalent to its first part, but the ray tracing is inverse. The experiment on the mathematical model of the double monochromator confirms this idea. For the case of polychromator or CCD spectrometer we can compensate that aberrations using the illumination system, consists of the spherical mirror. The angle of incidence of the light to the mirror is calculated such a way, that the astigmatism of the grating is compensated by the astigmatism of the mirror.

关键词： concave grating monochromator spectrometer astigmatism

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Double elements monochromatic light depolarizer 6

Double elements monochromatic light depolarizer

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current developments in optical design and engineering VI Conference

作者： Xu, FY Yan, WL Chi, ZT Shandong Architectural Engineering Institute (China) Qingdao Univ. (China)

ISBN: (纸本)0819422517

Nearly all light sources are partially polarization, the photomulciplier tube,photocell detector and grating have polarization sensitive effect. When we use natural light to do some experiment, the light from the light source must be depolarized. In order to reduce the polarization sensitive effect of the detector, we need fix a depolarizer in front of the detector. Since the times of 1928 year, there has been considerable attention paid to the study of polychromatic light depolarizer. But there are very limited number of ways to depolarize monochromatic light. We have ever introduced some kind of single element structure monochromatic light depolarizer made by using birefringent crystal. In this article we will introduce some kind of double elements structure monochromatic light depolarizer made by using some birefringent crystal and fused silica crystal. We will introduce their structure character, working principle and using specfication in detailed.

关键词： depolarizer monochromatic light birefringent crystal fused sidica

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Tailored edge-ray design for illumination with extended sources 6

Tailored edge-ray design for illumination with extended sour...

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current developments in optical design and engineering VI Conference

作者： Rabl, A Gordon, JM Teng, OP Ries, H Winston, R Ecole des Mines (France) Ben-Gurion Univ. of the Negev (Israel) Defence Science Organisation (Singapore) Paul Scherrer Institut (Germany) Univ. of Chicago (United States)

ISBN: (纸本)0819422517

The goal of the optical design of luminaires and other radiation distributors is to attain the desired illumination on the target with a given source. Usually there are constraints that should be satisfied, such as avoiding glare, maximizing the optical efficiency and respecting practical size limitations (not to mention considerations of fabrication costs, availability of materials and esthetics). While the required design procedure is well known for situations where the source can be approximated as a point or as a line, the development of an explicit analytical design method (as opposed to numerical search) for extended sources has begun only a few years ago. A solution for extended isotropic sources can be obtained by establishing a one-to-one correspondence between target points and edge rays, using the tools of nonimaging optics. The designs are called TED (tailored edge-ray designs). Particular solutions have been found in separate papers by Res and Winston(1,2) and by Gordon, Rabl and Ong(3-6). The present paper presents a topological classification of all possible solutions in two dimensions and discusses their general characteristics. We show that any illumination distribution can be obtained exactly in the central region of the target, but in general there will be a certain amount of spillover outside this region. Some flexibility for tailoring designs to specific requirements (size, glare control, etc.) can be gained by the choice of the solution type, the choice of the boundary conditions, and by the use of hybrid configurations that combine several types of solution. The design method is illustrated with specific examples.

关键词： luminaire illumination nonimaging optics glare control reflector design edge-ray extended sources

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design and performance of a robust WDM network 6

Design and performance of a robust WDM network

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current developments in optical design and engineering VI Conference

作者： Vaishnav, C Nieberger, M Jayasumana, AP Sauer, J Colorado State Univ. (United States) Hewlett-Packard Co. (United States) Univ. of Colorado/Boulder (United States)

ISBN: (纸本)0819422517

Increasing number of bandwidth intensive applications demand introduction of concurrency among multiple user transmissions, using techniques such as time division multiplexing (TDM) or wavelength division multiplexing (WDM), to achieve higher aggregate bandwidth. Commercial exploitation of WDM networks, despite their immense potential and promise, find extreme reluctance due to their vulnerability to the wavelength instability of the transmitter sources, and budgetary concerns raised by the inordinate cost of stabilizing them. Robust WDM network uses an intelligent multichannel wavelength tracking receiver that is capable of dynamically accommodating the manufacturing and operating imperfections of the transmitter sources. This yields Robust WDM to be a lucrative option for cost sensitive computer networking markets. In this paper we present Token-based medium access control protocol and network node architecture designed for the demonstration testbed of Robust WDM network. Behavior of average waiting time for a typical connection request on the network is presented using computer simulation.

关键词： optical networks WDM medium access control protocol TDM-based signaling circuit switching node architecture performance simulation delay model

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Development of a three-channel SWIR camera, for ground-based astronomical imaging. Two Micron All Sky Survey, 2MASS 6

Development of a three-channel SWIR camera, for ground-based...

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current developments in optical design and engineering VI Conference

作者： Milligan, S Cranton, BW Skrutskie, MF Telic Optics Inc. (United States) Univ. of Massachusetts/Amherst (United States)

ISBN: (纸本)0819422517

The Two Micron All Sky Survey (2MASS) project, currently underway, requires a camera mated to a 1.3 meter Cassegrain telescope that will simultaneously image the J, H and Ks spectral bands onto three separate NICMOS3 HgCdTe detector arrays. Dichroic beamsplitters allow the three FPA's to view the same field simultaneously. This paper reviews the development of this camera, presents a detailed analysis of the optical design, and discusses the techniques used to align the instrument and evaluate its performance. The low irradiance of astronomical sources, combined with background limited performance of the detectors, mandated a reimaging configuration and the enclosure of the camera optics within the cold volume. Correcting chromatic aberrations, and minimizing ghost images were additional challenges imposed by program requirements. The key to achieving high performance was found to be the selection of lens materials. The final F/3.5 optical design uses fifteen CaF2 elements and four Infrasil elements in an all-spherical configuration. The design is diffraction limited over the full format in the Ks spectral band, and is nearly so in the J and H bands. The tolerance environment is benign, making the design well suited for use in a cryogenic environment. A single channel prototype has been built and extensively field tested at the 50-inch telescope at Kitt Peak National Observatory. Each channel in the multi-spectral camera uses the same optical design successfully demonstrated in the prototype. currently, the first of two three-channel cameras is undergoing lab tests for image quality and channel registration.

关键词： near infrared optical design astronomical imaging chromatic aberration cryogenic camera 2MASS sky survey

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