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CONF ON LARGE-SCREEN-PROJECTION, AVIONIC, AND HAMLET MOUNTED DISPLAYS

作者： RUDOLPH, JD U.S. Precision Lens Inc. (United States)

ISBN: (纸本)0819405558

Recent focus on the development of HDTV systems worldwide has raised a critical concern--the economic viability of HDTV for the home marketplace. While projection systems performing at or above HDTV-quality levels exist today, they are designed for the institutional market and are priced far above the threshold for the individual consumer. Manufacturers will be under considerable pressure to significantly reduce the cost of HDTV projectors, as will the suppliers of key components such as lenses. Fortunately, recent developments have been made in the design, development and manufacturing technologies used to produce hybrid lenses for high-performance projection systems. This is particularly true for CRT-based front- and rear-projection systems for data and graphics applications. Extending these advances to HDTV would suggest that by the time HDTV is ready for high volume mass production, cost-effective projection lenses will be enhancing, not retarding, the market acceptance of HDTV.

关键词： Lenses Projection systems Video CRTs Modulation transfer functions Head-mounted displays Glasses optical filters Lens design Visualization

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optical distribution channel: An "almost-all" optical lan based on the fie1dcoding technique

Optical distribution channel: An "almost-all" optical lan ba...

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High-Speed Fiber Networks and Channels 1991

作者： Haas, Zygmunt ATandT Bell Laboratories Room 4F-501 HolmdelNJ07733 United States

Providing a single user with a very high (on the order of gigabit per second) bandwidth is a challenge that the research community is trying to address these days. The current commercially available (or available in the near future) networks, such as FDDI, can deliver on the order of hundred of Mbps to the end user. In some of these networks, the aggregate network bandwidth is much larger, but a single user can utilize only a small portion of the network capacity. We describe here a design of an "almost-All" optical local-Area network that is capable of providing Gbps directly to the user. The network design is based on the 802.6 topology, the 'field coding' technique that was reported by us earlier (in which the header and the data fields are encoded in different rates), and the principle of "almost all" optical switching. Several considerations guided us in our design, among them: cost, integration, and flexibility. By providing all of the above attributes, the optical Distribution Channel may be an example of future high-speed local area networks, in line with the FDDI-follow on (FDDI-FO) effort. © 1991 Proceedings of SPIE - The International Society for optical engineering. All rights reserved.

关键词： Local area networks

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optical LINK DEMONSTRATION WITH A LIGHTWEIGHT TRANSCEIVER BREADBOARD

OPTICAL LINK DEMONSTRATION WITH A LIGHTWEIGHT TRANSCEIVER BR...

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CONF ON FREE-SPACE LASER COMMUNICATION TECHNOLOGIES

作者： HEMMATI, H LESH, JR APOSTOLOPOULOS, J DELCASTILLO, H MARTINEZ, A Jet Propulsion Lab. (United States)

ISBN: (纸本)0819405078

A compact optical communications transceiver breadboard was constructed. In order to keep the mass of the breadboard as low as possible the design was made very simple. The entire package weighs less than 5 kg. The optical module uses a 40 mW diode laser and a two-axis voice coil actuator for beam steering. The breadboard is capable of locking onto a laser beacon within its field of view and transmitting the diode laser beam back toward the beacon. design of the breaboard, details of each component in the breadboard, and current experiments with the package are described.

关键词： Mirrors Semiconductor lasers Signal detection Sensors Laser applications Free space optical communications Free space optics Electronics Transceivers Transmitters

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Proceedings of SPIE - The International Society for optical engineering

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

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Infrared optical design and Fabrication: A Critical Review 1991

The proceedings contain 14 papers. The topics discussed include: history of infrared optics;lens design for the infrared;pacing elements of IR system design;optical materials for the infrared;athermalization of IR optical systems;narcissus in current generation FLIR systems;multimode IRST /FLIR design issues;key technologies for IR zoom lenses: aspherics and athermalization;analysis and performance limits of diamond -turned diffractive lenses for the 3 -5 and 8 -12 micrometer regions;design and specification of diamond -turned optics;robotic-based fabrication system for aspheric reflectors;refractive -index interpolation fit criterion for materials used in optical design;diamond windows for the infrared: fact and fallacy;and metal mirror review.

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RECENT developments ON HOLOGRAPHY IN CHINA

RECENT DEVELOPMENTS ON HOLOGRAPHY IN CHINA

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1ST INTERNATIONAL SEMINAR ON DISPLAY HOLOGRAPHY - THREE-DIMENSIONAL HOLOGRAPHY : SCIENCE, CULTURE, EDUCATION

作者： HSU, DS JIAO, JZ TAO, HY LONG, P Beijing Institute of Posts and Telecommunications (China) Beijing Univ. of Posts & Telecommunications (Canada)

ISBN: (纸本)0819402826

Since the 1985 Lake Forest International Conference on display holography (USA) more developments have been made on holographic applications in China among which the important events and progress were: the International Conference on holography applications em bossing holography new holographic optical elements and equipments etc. . 1. INTERNATIONAL CONFEPENCE ON GRAPHY APPLICATIONS'' ( I CHA ''86. BEIJING) More than 280 holographers from 18 countries gathered in the Science Hall in Beijing from July 2 to for the International Conference on holography applications''86. The conference was sponsor ed by the Chinese optical Society the Chinese Theoretical Applied Mechanics Society and cosponsored by the Society of Photooptical Instrumentation Engineers the European Photonic Association in cooperation with the China Association for Science And Technology. It was chaired by Prof. Wang Daheng vice president of the China Association for Science Technology and president of the Chinese optical Society cochaired by DP. H. J. Caulfield of the Univ. of Alabama Dr. G. von Bally of the Munster Univ. in West Germany and Dr. J. Tsujiuchi of the Tokyo Institute of Technology. SPIE Vol. 1238 Three-Dimensional Holography: Science Culture Education (1989) / 13

关键词： Holography Holograms Cameras Telecommunications optical design optical filters Speckle Holographic interferometry Holographic optical elements Holography applications

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POLARIZATION CONTROL BY A TWIST REFLECTOR

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JOURNAL OF APPLIED PHYSICS 1991年第4期70卷 1952-1956页

作者： SESHADRI, SR Department of Electrical and Computer Engineering University of Wisconsin‐Madison Madison Wisconsin 53706‐1691

A twist reflector is idealized by a surface which supports electric current in one direction only. When a transverse electric mode or a transverse magnetic mode is incident on a twist reflector, both types of modes are reflected. This property of the twist reflector to generate the cross-polarized mode is used in the development of a device that can rotate the plane of polarization of the incident electromagnetic wave by the rotation of the twist reflector about an axis normal to its surface. A ray-tracing technique is used to deduce the angle of rotation of the plane of polarization as a function of the orientation angle of the twist reflector. Numerical results are provided to illustrate the characteristics of the polarizer.

关键词： REFLECTORS design POLARIZATION ELECTRO?optical EFFECTS optical SYSTEMS ROTATION NUMERICAL SOLUTION RAY TRACING

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INGAAS VERTICAL-CAVITY SURFACE-EMITTING LASERS

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IEEE JOURNAL OF QUANTUM ELECTRONICS 1991年第6期27卷 1359-1367页

作者： GEELS, RS CORZINE, SW COLDREN, LA Department of Electrical and Computer Engineering University of California Santa Barbara CA USA

In this paper we give theoretical and experimental results for verticla-cavity surface-emitting lasers (VCSEL's). The modeling is applied to the design of InGaAs VCSEL's. A simple method is introduced to calculate the reflectivity of semiconductor stack mirrors with graded interfaces and compound metal/semiconductor stack mirrors. The theoretical predictions are compared to results from actual device measurements. A novel technique is introduced to determine material parameters: fabrication of in-plane lasers from VCSEL material. The procedure used to determine the optical mode in such an in-plane laser is described. Using the insight gained from our modeling, we have increased our external efficiency to > 30% with a threshold current density of 1 kA/cm2. Linewidth measurments on very high reflectivity VCSEL's have indicated widths as low as 85 MHz and linewidth-power products of 5 MHz. mW.

关键词： Vertical cavity surface emitting lasers Indium gallium arsenide Surface emitting lasers Laser modes Laser theory Semiconductor lasers Mirrors optical materials Semiconductor materials Reflectivity

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INTRAVASCULAR ULTRASOUND IMAGING AND INTRACARDIAC ECHOCARDIOGRAPHY - RECENT developments AND FUTURE-DIRECTIONS

INTRAVASCULAR ULTRASOUND IMAGING AND INTRACARDIAC ECHOCARDIO...

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CONF ON DIAGNOSTIC AND THERAPEUTIC CARDIOVASCULAR INTERVENTIONS

作者： PANDIAN, NG Tufts-New England Medical Ctr. (United States)

ISBN: (纸本)0819405159

Recent advances in catheter-based ultrasound imaging technology have led to the clinical reality of imaging coronary arteries and other vasculature in a manner that was not possible in the past. For the first time dynamic cross-sectional views of blood vessels can be obtained in patients in real time. currently available instruments include catheters that contain a mechanically rotating ultrasound probe, catheters in which the ultrasound crystal is fixed but a rotating mirror transmits and receives ultrasound in a circumferential format and catheters with synthetic aperture array processing. Considerable amount of in vitro work has given a fundamental basis for interpreting intravascular ultrasound images and for using the technique in a quantitative manner to assess vascular anatomy. The feasibility studies, the current cited clinical applications and the areas where further work is required are reviewed.

关键词： Intravascular ultrasound Ultrasonography Arteries Echocardiography Visualization Angiography Diagnostics Surgery Tissues Ultraviolet radiation

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COMPUTATIONAL FLUID-DYNAMICS AND ITS APPLICATION TO TRANSPORT PROCESSES

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JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY 1991年第1期52卷 5-47页

作者： COLLINS, MW CIOFALO, M Thermo-Fluids Engineering Research Centre City University London EC1V 0BH UK

Fluid transport behaviour is of great importance within the chemical process industry and in biotechnology. The complexity of this behaviour, reflected in the nature of the fundamental partial differential equations which describe it analytically, means that it has to be treated by numerical methods. In this paper the basic equations are given, and the approaches necessary to treat laminar and turbulent flows are carefully explained. As digital computers have increased in size, so has the comprehensiveness of the problems which can be treated, and the development of typical computer programs is described. Problems of accuracy and experimental validation are also surveyed, and it is shown that recent developments in whole-field optical measurement methods, and image and data processing are all involved here. Then, a review of work at City University is shown to comprise typical examples of applications to engineering situations and biotechnology problems. Chosen instances of the former are flow and heat transfer behaviour for convective enhancement caused by roughness elements, and the design balancing of a thermosyphon. The latter include such diverse studies as blood flows in arterial bifurcations, and heat and mass transport in grain storage. They involve the three-dimensional and transient capabilities of current codes, and their applicability to non-standard geometries.

关键词： COMPUTATIONAL FLUID DYNAMICS CODE VALIDATION

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LASER PHOTOCATHODE DEVELOPMENT FOR HIGH-current ELECTRON SOURCE

LASER PHOTOCATHODE DEVELOPMENT FOR HIGH-CURRENT ELECTRON SOU...

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CONF ON SHORT-WAVELENGTH RADIATION SOURCES

作者： MOUSTAIZIS, SD FOTAKIS, C GIRARDEAUMONTAUT, JP Foundation for Research and Technology-Hellas and Univ. of Crete (Greece) Univ. Claude Bernard Lyon 1 (France)

ISBN: (纸本)0819406805

A short review of recent developments in laser photocathode is presented. The importance of different processes, such as the single and multiphoton photoelectric effects are analyzed on the basis of recent experimental results. The conditions for the formation of small divergence, short pulse duration, and high current density electron beam from metallic photocathodes are discussed. Other types of photocathodes can be used as the semiconductor (GaAs, chalcopyrite) in order to produce polarized electrons. The main steps and the diagnostics for applications in photoinjector development is discussed.

关键词： Electron beams Laser development Photoelectric effect Nd:YAG lasers Semiconductor lasers Gold Pulsed laser operation Semiconductors Diagnostics Picosecond phenomena

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