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optical design of ARIES: the new near infrared science instrument for the adaptive f/15 Multiple Mirror Telescope

Optical design of ARIES: the new near infrared science instr...

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8th conference on current developments in optical design and optical engineering

作者： Sarlot, RJ McCarthy, DW Burge, JH Ge, J Univ Arizona Steward Observ Tucson AZ 85721 USA

ISBN: (纸本)0819432652

Steward Observatory is building a deformable f/15 secondary mirror that will compensate for atmospheric turbulence for the 6.5 m Multiple Mirror Telescope conversion. With the proposed adaptive optics system, this new telescope is expected to resolve diffraction limited images (greater than 80% Strehl ratio at 2.2 mu m), approximately an order of magnitude better than present seeing. this improved visibility with a larger fight collecting area and low thermal background requires a new science instrument, diffraction limited for the 1 to 5 mu m region. this science instrument, presently in its early manufacturing stages, consists of four cameras (optimized for plate scales from 0.019 arcsec/pixel to 0.102 arcsec/pixel), low resolution spectroscopy with grisms (lambda/Delta lambda from 250 to 500), high resolution spectroscopy with a cross-dispersed Echelle grating (lambda/Delta lambda from 3,000 to 60,000) and an atmospheric dispersion corrector. the cameras will provide simultaneous slit viewing, differential imaging and two pixel sampling over the full wavelength band. Each camera will operate with a 1024x1024 HgCdTe array optimized for the spectral region of the camera. An infrared tip/tilt sensor is also incorporated into the instrument that will relay natural guide star motion to the adaptive secondary in a closed-loop approach. this paper is an optical design instrument overview.

关键词： adaptive optics infrared camera spectrograph atmospheric dispersion corrector MMT

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optical microscope for nuclear emulsion readout -: system design and results in application

Optical microscope for nuclear emulsion readout -: system de...

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8th conference on current developments in optical design and optical engineering

作者： Winkler, K Körner, L Gussek, P Balogh, I Breitfelder, S Schlichting, J Dupraz, JP Fabre, JP Panman, J Papadopoulos, IM Zucchelli, P Van de Vyver, B Syst GmbH Opt JENOPTIK Laser Jena Germany

ISBN: (纸本)0819432652

Experiments such as CHORUS at CERN require the inspection of a large amount of nuclear emulsion plates exposed to particle beams. Rare events need to be found, measured and analysed. their features are stored as grains in microscopic dimensions in a three-dimensional stack of plates. A new, fully automatic immersion microscope system was developed for this purpose. It features high resolution, small depth of focus, large working distance, large field of view and synchronization of illumination and detector. An additional requirement is given by variations in the refraction index and in the relative thickness of immersion oil and emulsion. the approach used here is an imaging system based on a vario objective lens (variable oil immersion) with extreme numerical aperture, large working distance and wide field, combined with a matched high-aperture Koehler illuminator. the light source is a mercury are lamp, combined with a filter package for the g-line. It includes liquid crystal elements for synchronized shuttering and variable attenuation. the theoretical resolution is less than 1 micron in x, y, z within a volume of 0.5mm diameter (x, y) times 1 mm scanning depth (z) in all situations within a predefined index range (1.49 to 1.54). three identical pieces of the system have been built. the experimentally measured resolution confirms the expectations and is better than 1 micron in all three dimensions. this is the result of a complex process of system design and manufacturing, unifying optical, opto-mechanical and optoelectronical contributions. this process spans from the early stages of feasibility and manufacturing up to the test and adjustment procedures. the three prototypes are operational since the fall of 1998 in the frame of the CHORUS project. Practical experience and application results are presented.

关键词： optical microscopy oil immersion nuclear emulsion readout variable immersion systems design

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design of a reflective/diffractive hybrid optical system

Design of a reflective/diffractive hybrid optical system

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conference on current developments in optical design and engineering VII

作者： Shen, MZ Guo, YH Lu, ZK Chinese Acad Sci Inst Opt & Elect Chengdu 610209 Peoples R China

In this paper we describe the design of a reflective / diffractive hybrid optical system, which features no obscuration, re-imagining system with 100% cold shield efficiency, 4 degrees of field of view, near diffracti... 详细信息

ISBN: (纸本)0819428841

关键词： infrared optical systems optical design hybrid optical system

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Review of the design and manufacturing procedures for large format holographic optical element

Review of the design and manufacturing procedures for large ...

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conference on current developments in optical design and engineering VII

作者： Stojanoff, CG Schütte, H Schulat, J Fröning, P Aachen Tech Univ Rhein Westfal TH Aachen Lehr & Forsch Gebiet Hochtemp Thermodynam D-52056 Aachen Germany

ISBN: (纸本)0819428841

the objective of this research program was the development of the technology for the industrial manufacturing of HOEs for technical applications such as: holographic solar concentrators for utilization in photovoltaic energy conversion and solar photochemistry, and integrated holographic stacks for daylighting, glazing and shading in buildings. Some of the fabricated HOEs exhibit apertures in the order of 8 square meters. the accomplished technology facilitates the continuous fabrication of the holographic films on glass or plastic substrata. the standard holographic material we use for the fabrication of HOEs is dichromated gelatin (DCG) on glass or plastic film (PET) substrata the dichromated gelatin layer could be prepared with different compositions to accommodate the desired exposures and chemical processing procedures. At present we manufacture holographic plates on glass substrata in sizes of up to 1 meter square. the holographic film on plastic substratum is 20 cm wide and could be made in lengths of hundredths of meters. the inexpensive fabrication of such large formats is attained by automation of the entire process: film manufacturing, hologram copying, development and test. We present in this paper the design considerations and the developed manufacturing procedures. these comprise the fabrication of large format reflective holograms for concentrating mirrors and the copying of transmissive holograms, such as gratings and lenses, using in-plane contact copying in checkerboard arrangement or rotating drum continuous copying onto an endless plastic film.

关键词： holography HOE large aperture optics fabrication procedures optical materials solar concentrators

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High magnification zoom lenses for 3-5 μm applications

High magnification zoom lenses for 3-5 μm applications

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conference on current developments in optical design and engineering VII

作者： Sinclair, RL Wescam Inc Flamborough ON L9H Canada

ISBN: (纸本)0819428841

Over the past twenty years numerous papers and patents have reported on the design of infrared zoom lenses for a variety of civilian and military applications. the vast majority of these lenses have been afocal 8-12 mu m zoom lenses with magnification ratios of five to twenty. With the advancement of 3-5 mu m staring focal plane array technology a growing demand has emerged for a compact imaging 3-5 mu m zoom lens. To meet this demand a variety of such zoom lenses have been designed which support image formats of over 10 mm diagonal. In this paper the preliminary design of a high magnification 3-5 mu m zoom lens is described. Infrared system modeling, detailed lens performance and manufacturing issues are reviewed.

关键词： infrared lens zoom lenses diffractive optical elements lens design

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Infrared 8 to approximately 11.5 μm high efficiency antireflection coating on Germanium substrate

Infrared 8 to approximately 11.5 μm high efficiency antiref...

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Proceedings of the 1998 conference on current developments in optical Elements and Manufacturing

作者： Ye, Kefei Su, Zhaoxu Liu, Jiahuan Yang, Chongming Xian Inst of Applied Optics Shaanxi China

To increase the strength of infrared high efficiency antireflection coatings is a problem difficult to be resolved. A mixture of BaF2 and CeF2 has been used as a low refractive index material to design and prepare infrared 8 to approximately 11.5 μm high efficiency anti-reflection coating to acquire good strength of film layer. the processing conditions of the films deposition have also been introduced. the spectral transmittance measured, physical and chemical properties of the infrared anti-reflection coating are given.

关键词： Antireflection coatings

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AlGaAs/InGaAs PHEMT preamplifier for optical communication systems

AlGaAs/InGaAs PHEMT preamplifier for optical communication s...

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International conference on Solid-State and Integrated Circuit Technology

作者： Jinping Ao Shiyong Liu Qingming Zeng Yonglin Zhao Keli Cai Xianjie Li Xhixian Jiao Jianjun Gao Chunguang Liang Electronic Engineering Department Jilin University China National Key Laboratory of ASIC Hebei Semiconductor Research Institute Shijiazhuang Hebei China

the design, fabrication and characteristics of a AlGaAs/InGaAs PHEMT monolithic transimpedance preamplifier is described. the PHEMT material used here is based on /spl delta/-doped carrier supplying layer and GaAs/AlGaAs superlattice buffer. the transconductance and output conductance of a 1 /spl mu/m-gate PHEMT is 250 mS/mm and 8mS/mm respectively with threshold voltage of -1.2 v, the maximum saturation current density is 235 mS/mm. On-wafer network analysis with HP8510 network analyzer shows its cut-off frequency of 21 GHz and maximum oscillation frequency of 40 GHz. Transimpedance preamplifier its measured maximum transimpedance gain of 51.4 dB/spl Omega/ with -3 dB bandwidth no less than 5.05 GHz. the input equivalent-noise current density is 13 PA//spl radic/Hz.

关键词： Indium gallium arsenide PHEMTs Preamplifiers optical fiber communication current density Cutoff frequency optical device fabrication Conducting materials optical materials Gallium arsenide

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AIGaAs/InGaAs PHEMT Preamplifier For optical Communication Systems

AIGaAs/InGaAs PHEMT Preamplifier For Optical Communication S...

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1998 5th International conference on Solid-State and Integrated Circuit Technology

作者： Jinping Ao Shiyong Liu Qingming Zeng Yonglin Zhao Keli Cai Xianjie Li Zhixian Jiao Jianjun Gao Chunguang Liang Electronic Engineering Department Jilin University Hebei Semiconductor Research Institute National Key Laboratory of ASIC

the design,fabrication and characteristics of a AIGaAs/InGaAs PHEMT monolithic transimpedance preamplifier is *** PHEMT material used here is based onδ-doped carrier supplying layer and GaAs/AlGaAs superlattice *** transconductance and output conductance of a lμm-gate PHEMT is 250mS/mm and 8mS/mm respectively with threshold voltage of -1.2v,the maximum saturation current density is 235mA/***-wafer network analysis with HP8510 network analyzer shows its cut-off frequency of 21GHz and maximum oscillation frequency of 40GHz. the transimpedance preamplifier exhibits its measured maximum transimpedance gain of 51.4dBΩwith -3dB bandwidth no less than 5.05GHz. the input equivalent noise current density is 13PA/Film

关键词： PHEMT AIGaAs/InGaAs PHEMT Preamplifier For optical Communication Systems InGaAs

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Feasibility study for BNCT of skin melanoma with an accelerator-based neutron source

Feasibility study for BNCT of skin melanoma with an accelera...

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5th International conference on Applications of Nuclear Techniques - Neutrons in Research and Industry

作者： Agosteo, S Colautti, P Corrado, MG dErrico, F Monti, S Silari, M Tinti, R Tornielli, G Departimento di Ingegneria Nucleare Politecnico di Milano via Ponzio 34/3 Milano I-20133 Italy INFN Laboratori Nazionali di Legnaro via Romea 4 Legnaro Padova I-35020 Italy Università degli Studi di Milano Dipartimento di Fisica via Celoria 16 Milano I-20133 Italy Dipartimento di Costruzioni Meccaniche e Nucleari Università di Pisa via Diotisalvi 2 Pisa I-56126 Italy ENEA-ERG-FISS-FIRE via Martiri di Monte Sole 4 Bologna I-40129 Italy Consiglio Nazionale delle Ricerche ITBA via Ampère 56 Milano I-20131 Italy CERN Geneve 23 1211 Switzerland Dipartimento di Fisica Università di Padova via Marzolo 8 Padova I-35131 Italy

ISBN: (纸本)0819422630

the feasibility of an accelerator-driven thermal neutron source for Boron Neutron Capture therapy (BNCT) of skin melanoma is discussed, based on the design of an analogous source for BNCT of the explanted liver. Monte Carlo simulations were performed by introducing some variations in the moderator geometry of that source. Neutrons are generated by 7 MeV deuterons impinging on a thick beryllium target. the neutron moderator consists of a nuclear graphite structure containing a heavy water tank in turn enclosing the beryllium target. the moderator materials were chosen in order to minimize the production of prompt gamma rays. the requested neutron fluence (10(13) cm(-2)) can be achieved in three hours with a deuteron current in the range of 3-8 mA.

关键词： Moderators

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Raytheon FED technology update

Raytheon FED technology update

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4th conference on Cockpit Displays - Flat Panel Displays for Defense Applications

作者： Palevsky, A Visinski, JR Raytheon Co. (United States)

ISBN: (纸本)0819424722

the field emission display (FED) delivers all the advantages of the cathode ray tube (CRT) without the disadvantages. the FED presents the viewer with an unrestricted viewing angle, full-motion video bandwidth, wide operating (-54°C to +95°C) and storage (-62°C to +115°C) temperatures, and "instant on" anywhere in the operating temperature range. the FED does not have the CRT disadvantages of center to edge spot size variations, astigmatism, geometrical position errors, linear distortion, and misconvergence. Additional FED advantages include shallow package depth, fewer process steps than AMLCD, potential lower cost than AMLCD, 1000 times less peak anode current per pixel (FED turns on one row at a time) and inherent shock and vibration resistance provided by low mass internal elements. (See Figure 1 - Field Emission Display is a Flat CRT) Raytheon CRT products are currently installed in high performance military and commercial systems. these platforms include fixed wing aircraft: F-14, F-15, F-16, F/A-18, S-3A, B-1B, JAS-39, Tornado, EF-1 1 1 and B-52; rotary wing vehicles as Apache AH-64D and EH-1O1; shipboard applications SPA-25G and CCS-MKII Los Angeles class submarine fire control system; world-wide air traffic control programs as Canadian RAMP, OIDT, and in some of the other nineteen countries installing Raytheon air traffic control products. FED high power screen efficiency in a monochrome display can exceed 25 lumens per watt and 1 5 lumens per watt in full color applications. Average power dissipation is determined by the higher duty cycle of video content. the 8KV anode of the Raytheon FED yields the highest brightness of any flat panel display at 300 IL to 400 fL after 10% contrast filtering in a 10,000 fc ambient environment. "Instant on" full brightness is achieved within five seconds within the -54°C to +95°C operating range without heaters, ITO layers, anti-freeze or preheating or pre-cooling. the FED full viewing angle of 1600 x 1600 is usable in por

关键词： Plasma display panels Field emission displays CRTs Video Computer aided design Glasses optical fabrication equipment Manufacturing Flat panel displays optical filters

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