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

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Compact optical interconnect module

Compact optical interconnect module

引用

Conference on Microelectronic Structures and MEM for optical Processing iii

作者： Peters, BR Reardon, PJ Reardon, JV Bright Concepts Inc. (United States)

ISBN: (纸本)081942658X

The results of a design study for the development of an eye-safe (near-infrared wavelength), compact, multichannel optical interconnect system appropriate for integration with electronics and to be used for short distance communication are discussed. There are potential advantages to using optical interconnects instead of current hardwire interconnections for data transmission over short distances. This technology also has potential applications to data transmission for computing applications. This design study focused on the development of an optical interconnect module to function much like a conventional data cable. The module must be rugged, small, easily integrated into current data transfer, and must have the potential to be produced in volume and at low cost. The desired system level performance of the optical interconnects was evaluated and design specifications were determined for the optical design. Trade studies involving current technologies were performed to determine suitable hardware configurations. These requirements pointed toward the application of microfabrication technology and microoptics in order to accomplish the design goals. A pseudo-monolithic silicon-based optical system has been proposed involving diffractive and microrefractive optics along with integrated sensors and emitters. The device emphasizes the use of existing technologies gathered from different disciplines and integrated into one system.

关键词： diffractive optic diffuser laser diode interconnect microlens microoptic

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design of thin film filters for the monitoring of chemical reactions

Design of thin film filters for the monitoring of chemical r...

引用

Conference on optical Thin Films V - New developments

作者： Dobrowolski, JA Verly, PG Myrick, ML Nelson, M Aust, JF National Research Council of Canada (Canada) Univ. of South Carolina (United States)

ISBN: (纸本)0819425559

A new optical computation method for the monitoring of chemical reactions requires filters with spectral transmittance curves that vary in a complicated way with wavelength. In this paper we consider the design of two different sets of filters, one of which could be used to predict the degree of curing of a polymer from an analysis of its Raman spectra. The problem is not easy because the required filters have sharp spectral features in a narrow spectral region. Two different design methods are used. The performance of one set designed by conventional means is very close to the specifications. However, current thin film deposition methods are probably incapable of producing filters of such thickness. The second solution is based on the use of several filters placed in series. It should be possible to implement this particular solution, but its performance is not nearly as good. Nevertheless, calculations indicate that this filter pair should also result in a satisfactory control of the curing process.

关键词： thin films coatings filters multilayers design chemical reactions optical computing

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developments in autostereoscopic displays using holographic optical elements.

Developments in autostereoscopic displays using holographic ...

引用

Conference on Stereoscopic Displays and Virtual Reality Systems IV

作者： Trayner, D Orr, E Richmond Holographic Studios Ltd. (United Kingdom)

ISBN: (纸本)0819424234

The use of holographic optical elements (HOEs) in conjunction with LCDs to make high performance economical autostereoscopic displays is a new and promising development, The very first demonstrators showed that the technique can be used to produce very good quality 3D and 2D images, Our current work is directed at improving performance and exploring other opportunities opened up by the basic concept, These include improved optical design of the HOE and, possibility of using LEDs as light sources and that of using the HOE to generate 3D an at the same time provide colour separation to allow the display of full colour images on a monochrome LCD without the use of conventional colour filters. In addition the use of this technology to display two or more images on the LCD such that two viewers will each see different images on the one display.

关键词： autostereoscopic stereoscopic 3D holographic optical element LCD LED

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Improved performance iii-V quantum well IR photodetectors: review of current and potential focal plane technology

Improved performance III-V quantum well IR photodetectors: r...

引用

Photodetectors: Materials and Devices II

作者： Claiborne, Lewis T. Lockheed Martin Vought Systems Dallas TX USA

ISBN: (纸本)0819424102

The maturation of the iii-V materials technology has provided an opportunity for the development of a producible and affordable class of IR detector arrays. designs based on the GaAs compounds permit the realization of multiple quantum well IR photodetectors (QWIPs) which are useful for long wavelength focal plane arrays with sizes demonstrated up to 640 × 480. Similar designs using InP based materials can cover an even broader IR spectral region with lattice matched structures. QWIP demonstrations have been made for midwave detectors and very long wave detectors as well. New detector structures that improve optical performance and reduce bias current can lead to higher performance QWIPs which approach the performance of mercury cadmium telluride at moderate operating temperatures. These developments offer the possibility of practical, large, affordable IR focal plane arrays in the near future.

关键词： Infrared detectors

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developments at COAST

Developments at COAST

引用

optical Telescopes of Today and Tomorrow

作者： Warner, Peter J. Baldwin, John E. Boysen, Roger C. Burns, David Haniff, Christopher A. Lawson, Peter R. Mackay, Craig D. Rogers, John Scott, Tania R. Wilson, Donald M. Young, John S. Mullard Radio Astronomy Observatory and Inst. of Astronomy Cambridge Cambs UK

ISBN: (纸本)0819422681

The Cambridge optical aperture synthesis telescope (COAST) is a four element interferometer which measures visibility amplitudes and closure-phases. It produced its first images in 1995 and is now in a complete form, very similar to the original conception. In this paper we discuss the design and current status of the interferometer.

关键词： Telescopes

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Stabilization in an optical fiber interferometer using a semiconductor laser

Stabilization in an optical fiber interferometer using a sem...

引用

Micro-optical Technologies for Measurement, Sensors and Microsystems II and optical Fiber Sensor Technologies and Applications

作者： Lamela, Horacio Garcia, J.A. Leones, M. Santos, J.I. Vazquez, C. Univ. Carlos III de Madrid Leganes-Madrid Spain

ISBN: (纸本)0819425192

In this paper we present results of our stabilization scheme for an optical fiber Mach-Zehnder interferometer with a diode laser as light source. It is developed for compensating the drift path difference produced by external parameters as the environmental temperature. The optoelectronic setup in which the interference signal is fed back to the injection current of the laser diode is investigated in order to obtain a stabilized system. Details on parameter characterization, system design and the results observed are given.

关键词： Interferometers

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Development of a passive electrical-to-optical pulse converter for the production of high resolution fiducial signals

Development of a passive electrical-to-optical pulse convert...

引用

Conference on Laser Diode and LED Applications iii

作者： Paul, JD Hall, CR Mozzano, S Grant, S Los Alamos National Laboratory (United States) AlliedSignal Inc. (United States)

ISBN: (纸本)0819424110

The analysis of many high explosives (HE) involves the use of rotating-mirror cameras and high speed film. Fiducial timing spots are made on the film to provide temporal reference to the experimenter during subsequent evaluation. The writing speed of the ''streak'' camera is 10 millimeters per microsecond, thus, the optical fiducial pulse width must be on the order of tens of nanoseconds to generate a useful spot size. For this application, a useful spot size corresponds to a width of 200-300 micrometers. Present systems employ light-emitting diodes for this task, mounting them at the focal point of the camera. However, the size and clarity of the current timing spot on the film is less than optimum. Furthermore, experiments involving high explosives require the isolation of the electronic instrumentation from the experimental hardware and passive operation is always preferred if not required. This is due to safety requirements as well as instrumentation ground loop and EMP concerns. Another restriction is the diminished sensitivity of the high-speed film to wavelengths above 600 nanometers, which narrows the field of possible optical sources considerably. A passive, fiber-coupled system based upon a 635 nanometer laser diode has been developed and tested. The development process, final design and test results are presented and the improved signal resolution is compared with current technology.

关键词： fiber-coupled laser diode optical isolation saturable-core transformer low-jitter timing high-resolution fiducial streak cameras

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design and performance of a double hot arm polysilicon thermal actuator

Design and performance of a double hot arm polysilicon therm...

引用

3rd Conference on Micromachined Devices and Components

作者： Burns, DM Bright, VM Air Force Institute of Technology (United States)

ISBN: (纸本)0819426563

This paper presents a new polysilicon actuator design. In a typical thermally-driven actuator, the hot arm is thinner than the cold arm, so the electrical resistance of the hot arm is higher. When electric current passes through the device (both the hot and cold arms), the hot arm is heated to a higher temperature than the cold arm. This temperature increase causes the hot arm to expand in length, thus forcing the tip of the device to rotate about a flexure. The new thermal actuator design eliminates the parasitic electrical resistance of the cold arm through the use of an additional hot arm. The second hot arm results in an improvement in electrical efficiency by providing an active return current pass. Also, the rotating cold arm can have a thinner flexure than the flexure in a traditional device because it does not have to pass an electric current. The thinner flexure results in an improvement in mechanical efficiency. This paper compares single and double hot arm thermally-driven actuator designs, and demonstrates various devices constructed with the new thermal actuator design. Deflection and force measurements of both actuators as a function of applied electrical current are presented.

关键词： MEMS polysilicon actuator motor mirror

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design of a fluorescence-lifetime imaging microscope workstation

Design of a fluorescence-lifetime imaging microscope worksta...

引用

Advances in Fluorescence Sensing Technology iii

作者： Boddeke, Frank R. Van Geest, Lambertus K. Young, Ian T. Delft University of Technology Faculty of Applied Physics Pattern Recognition Group Lorentzweg 1 2628 CJ Delft Netherlands Lambert Instruments B.V. Turfweg 4 9313 TH Leutingewolde Netherlands

One of the promising recent developments in fluorescence microscopy is fluorescence lifetime imaging microscopy. This type of microscopy images the lifetime of fluorescence molecules (in the nano second range) rather than the amount of light emitted by these molecules. This physical property is of interest while it gives information about the local environment of the molecule, such as molecular concentration of O2, Ca2+, pH, and conjugation. Our goal is to design a affordable, robust and easy-to-use FLIM workstation which is completely automated and does not need any difficult calibration. Therefore we are developing a workstation which applies a homodyne detection scheme (frequency range: 1 - 100 MHz) with use of an intensity modulated laser-diode (635 nm) and a gain modulated intensified CCD camera to image fluorescence lifetimes in the range of 1 - 100 ns. Using these components it is possible to make a FLIM workstation based on a normal fluorescence microscope by just replacing the light source and image detector. The FLIM image acquisition procedure in software allows automatic optical measurements of fluorescence lifetimes in different ranges and mixtures of lifetimes by adjusting the modulation frequency. ©2005 Copyright SPIE - The International Society for optical engineering.

关键词： Molecules

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Computer-aided fit testing: An approach for examining the user/equipment interface

Computer-aided fit testing: An approach for examining the us...

引用

Conference on Three-Dimensional Image Capture

作者： Corner, B Beecher, R Paquette, S U.S. Army Natick Research Development & Engineering Ctr. (United States) Beecher Research (United States)

ISBN: (纸本)081942434X

developments in laser digitizing technology now make it possible to capture very accurate 3D images of the surface of the human body in less than 20 seconds. Applications for the images range from animation of movie characters to the design and visualization of clothing and individual equipment (CIE). In this paper we focus on modeling the user/equipment interface. Defining the relative geometry between user and equipment provides a better understanding of equipment performance, and can make the design cycle more efficient. Computer-aided fit testing (CAFT) is the application of graphical and statistical techniques to visualize and quantify the human/equipment interface in virtual space. In short, CAFT looks to measure the relative geometry between a user and his or her equipment. The design cycle changes with the introducing CAFT;now some evaluation may be done in the CAD environment prior to prototyping. CAFT may be applied in two general ways: 1) to aid in the creation of new equipment designs and 2) to evaluate current designs for compliance to performance specifications. We demonstrate the application of CAFT with two examples. First, we show how a prototype helmet may be evaluated for fit, and second we demonstrate how CAFT may be used to measure body armor coverage.

关键词： fit-testing visualization 3-D digitizing clothing equipment

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