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

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

引用

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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Diffractive phase screen for superresolution focal spot

Diffractive phase screen for superresolution focal spot

引用

Conference on current developments in optical design and engineering VII

作者： Zhai, JH Yan, YB Huang, DW Wu, MX Jin, GF Carnegie Mellon Univ Data Storage Syst Ctr Pittsburgh PA 15213 USA

ISBN: (纸本)0819428841

A new design of diffractive superresolution elements with surface-relief phase screen has been presented to improve the quality of the superresolved diffractive patterns. The diffractive phase screens have been designed by our proposed global optimization method, called Global/Local United Search Algorithm. The new algorithm combines the global exploration properties of Genetic/Annealing algorithms and the accurate exploitation power of the "hill-climbing" method, resulting in the characteristics of fast convergence, global search capability, and high performance diffractive patterns. The designed diffractive phase screens can improve the performance of the superresolved diffractive patterns from the view of Strehl ratio, reduction of the focal spot, and control of the sidelobe intensity. The results show that the diffractive phase screen can produce much small spot size and great lower sidelobe intensity while keeping an acceptable Strehl ratio, which has important applications in high density data storage.

关键词： optical superresolution techniques diffractive phase screen superresolved diffractive patterns Global/Local Unit Search Algorithm high density data storage

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Locking Lorentz Slides

Locking Lorentz Slides

引用

Conference on current developments in optical design and engineering VII

作者： Vranish, JM Germann, LM Lutter, DR Lawrence, DA NASA Goddard Space Flight Ctr Greenbelt MD 20771 USA

ISBN: (纸本)0819428841

The purpose of this paper is to introduce the concept of a Locking Lorentz Slide. Lorentz Slide actuators, which are based on the Lorentz force principal of physics and are also called Voice Coils, have earned wide-spread. use in the aerospace industry because of their superior performance (precision, force, stroke, wide temperature range including cryogenics, reliability and compactness). NASA has particularly favored these devices in their space telescopes and scientific instruments. Up to now "Voice Coils" have had to keep power on to hold position, which is limiting in many space applications. NASA, however, has found what promises to be a simple, innovative work-around with its Locking Lorentz Slide approach. This paper is an introduction to that concept and its possibilities, so, in this paper, the Locking Lorentz Slide is described, its principles of operation explained and its expected performance given. Since NASA is embarking on a development effort for this actuator more technical papers detailing hardware, tests and detailed analysis will follow.

关键词： Actuators Servomechanisms Space telescopes Aerospace engineering Cryogenics Magnetism Reliability Sensors Hardware testing Temperature metrology

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Minimizing tool marks in deterministic microgrinding

Minimizing tool marks in deterministic microgrinding

引用

Conference on current developments in optical design and engineering VII

作者： Li, Y Gracewski, S Funkenbusch, P Ruckman, J Univ Rochester Ctr Opt Mfg Rochester NY 14627 USA

ISBN: (纸本)0819428841

In deterministic microgrinding of glass optics with metal bond diamond ring tools, optical surfaces exhibit residual cutting tool marks that can significantly affect the efficiency of the finish polishing process;The tool marks for spherical surface generation appear as curves that follow contact lines between the tool and workpiece from the center to the edge of the workpiece. The tool marks are circumferentially periodic and the number is typically equal to the k-ratio, i.e. the ratio of grinding tool speed to workpiece speed. This paper describes the effect of the k-ratio, the tool cutting face width, and their interaction on tool mark generation. We introduce a new parameter equal to the ratio of tool cutting face width to the k-ratio spacing. Experimental results indicate that this ratio is the critical factor for tool mark generation. For ratios greater than a critical value, the amplitude of tool marks will be reduced to a level not detectable by interferometry. The influences of vibration and tool roughness are also discussed. The model presented provides new insight into the generation of tool marks and optimization of deterministic microgrinding processes.

关键词： grinding optical fabrication machine vibration tool marks tool cutting face width tool alignment

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design and fabrication of hybrid dichroic mirrors for light separation/recombination by using flat plate

Design and fabrication of hybrid dichroic mirrors for light ...

引用

Conference on current developments in optical design and engineering VII

作者： Park, JH Hwang, YM Kim, YH Kim, EH Jeong, SY Samsung Adv Inst Technol Display Mat Lab Mat & Devices Sector Suwon 440600 South Korea

ISBN: (纸本)0819428841

We report the design and fabrication of Hybrid Dichroic Mirrors (HDM) for the separation and the recombination of white laser beam by using small sized flat plate far a small Laser Projection Display (LPD) system. This small sized laser projection display system is consist of a white laser, hybrid dichroic mirrors, 3-channel AOM and a beam scanning part. Red, green and blue light beams are separated by one flat plate dichroic mirror and also modulated by the 3-channel AOM, are recombined to one beam by another flat plate dichroic mirror. These hybrid dichroic mirrors are designed to measure the separation and recombination of s-polarized light beams of 647, 515, 488nm wavelength from the white laser. Key element of the mirror design includes the quarter wavelength multilayers optimized to provide the best performance for the separation and recombination of light beams. The calculated values of the transmittance, which are pass through the hybrid dichroic mirror, are 95% for each separated/recombined color beams. The measured values of transmittance are over 90%.

关键词： Hybrid Dichroic Mirrors Laser Projection Display 3-channel AOM separation and recombination

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3-channel acousto-optic modulator for laser projection display system

3-channel acousto-optic modulator for laser projection displ...

引用

Conference on current developments in optical design and engineering VII

作者： Kim, YH Park, JH Cha, SN Hwang, YM Samsung Adv Inst Technol Display Mat Lab Mat & Devices Sector Suwon 440600 South Korea

ISBN: (纸本)0819428841

A small laser projection display system is designed with a hybrid dichroic mirror for color separation, a hybrid dichroic mirror for color recombination, a 3-channel acousto-optic modulator(AOM) and a scanning part. The 3-channel AOM modulates red, green and blue laser breams. The wavelengths of red, green and blue beams are 647, 515 and 488 nm respectively. The carrier frequencies of each channel of AOM were adjusted to minimize the diffraction angle differences among red, green and blue laser beams. The carrier frequencies are 130, 168, 178 MHz for red, green and blue laser beams respectively. The measured diffraction angle after the carrier frequency control equals to the calculated diffraction angle. The transducer structure of AOM was optimized to get a high diffraction efficiency and to maximize isolation between adjacent channels by a slicing saw, which enhanced the electrical and acoustic isolation. The impedance matching-circuit of each electrode is housed in a separate compartment to suppress electrical crosstalk. The diffraction efficiency and risetime of the 3-channel AOM are over 85% and 50 nsec per each cell. The crosstalk between the channels is less than -30 dB.

关键词： 3-channel acousto-optic modulator hybrid dichroic mirrors laser projection display optical crosstalk electrical crosstalk

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Computational materials science: an increasingly reliable engineering tool (example: defects in HgCdTe alloys)

Computational materials science: an increasingly reliable en...

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Conference on Photodetectors - Materials and Devices iii

作者： Sher, A van Schilfgaarde, M Berding, MA SRI Int Menlo Park CA 94025 USA

ISBN: (纸本)0819427268

Computational materials science has evolved in recent years into a reliable theory capable of predicting not only idealized materials and device performance properties, but also those that apply to practical engineering developments. The codes run on workstations and even now are fast enough to be useful design tools. A review will be presented of the current status of this rapidly advancing field. As a demonstration of the power of the methods, predictions of the native point and complex defect, and impurity densities for the Hg-0.8 Cd0.2Te alloy as functions of external processing conditions will be treated. Where measurements have been done, the observed values agree well with the predictions. As an example, we fmd that As incorporates predominately on the cation sublattice, if the material is grown from the Te side of the existence curve las occurs in MBE growth), whereas it tends to reside on the anion sublattice in Hg-saturated growth. On the cation sublattice As is a donor. It is an acceptor on the Te sublattice. We have devised a post-MBE-growth processing method to encourage the transfer of As from the cation to the anion sublattice. Those aspects of the proposed process that have been tested work.

关键词： computational materials science defects in HgCdTe

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Optimized design on the light outlet of optical fibre large screen display

Optimized design on the light outlet of optical fibre large ...

引用

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

作者： Shen, Shuqun Yao, He Shen, Yuchao Fan, Rong Beijing Univ of Posts & Telecom Beijing China

optical fibre large screen display is a novel technique in the field of large screen display. The design of the optical fibre light outlet (polyvinyl rode shaped) should be optimized in consideration of the viewing field and the radiant intensity of the screen. The principal direction and the field distribution of the light output of the rode shaped outlet should be considered in designs. The conclusion of the computer simulation shows that the brightness of the screen will reach 4000 nit, the viewing angle will be 20° in meridian plane and 120° in sagittal plane.

关键词： Fiber optics

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design and fabrication of 256×256 diffractive microlens arrays on Si substrates

Design and fabrication of 256×256 diffractive microlens arr...

引用

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

作者： Li, Yi Yi, Xinjian Hao, Jianhua Huazhong Univ of Science and Technology Wuhan China

256×256 diffractive microlens arrays have been designed by considering the independent optical and processing parameters for 3-5 μm wavelength with a microlens size of 100 μm. The lens F number and array pitch are 1.5 and 100 μm, respectively. The diffractive microlens arrays have been fabricated on the surface of Si substrates by successive photolithography and Ar+ ion-beam-etching technique. The practical processes and fabrication method are discussed. The optical characteristics and measurements of the diffractive microlens arrays are presented.

关键词： optical instrument lenses

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GTC control system. An overview

GTC control system. An overview

引用

Telescope Control Systems iii

作者： Filgueira, José M. Rodríguez, Daniel Spain

The GTC project is in charge of the construction of an optical/IR 10-meter class telescope at the Observatorio del Roque de los Muchachos in Canary Islands. The GTC control system (GCS) will be responsible for the management and operation of the telescope, including its instrumentation. Its conceptual design has been completed in summer 1997. The continuous and rapid development of hardware, software and communications technology has permitted a greater complexity in control systems. In their turn, the development of active and adaptive optics, the new methods of optimizing available observing time and the continuous development programs to maintain telescope competitiveness present new challenges in the design of control systems. During its life-cycle, the GCS will be subject to continuous changes brought about by different factors, such as the advent of new technologies, the evolution of the requirements, the development of new instruments and fault correction. These factors must be taken on board with the minimum possible impact, not only on the project but also on the availability of the GTC once it enters into operation. This will only be possible through the selection and planning of an adequate technological framework that enables these changes to be assimilated throughout the life-cycle of the telescope. In this presentation the fundamental aspects of this framework along the current status of the control system design are outlined.

关键词： optical telescopes

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