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检索条件"任意字段=Conference on Current Developments in Optical Design and Engineering V"

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III–v quantum dots for optoelectronic device applications

III–V quantum dots for optoelectronic device applications

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International conference on Computers and Devices for Communication (CODEC)

作者： L. Fu G. Jolley S. Mokkapati A. Majid H. F. Lu H. H. Tan C. Jagadish Department of Electronic Materials Engineering Research School of Physics and Engineering Australian National University Canberra ACT Australia

Quantum dots (QDs) grown by Stranski-Kranstanov method are of current interest for the application of high performance optoelectronic devices due to their unique three dimensional carrier confinement. However, one big limitation for the QD-based devices is the difficulties in predicting and controlling their operating wavelength accurately due to the extremely sensitive selforganized process of dot formation. In this talk, we will demonstrate the growth, fabrication and characterisation of two main optoelectronic devices, namely QD lasers and infrared photodetectors (QDIPs), by metal-organic chemical vapour deposition (MOCvD). various QD structural design, growth and processing schemes will be also presented for spectral tuning of the lasers and QDIPs, including the approach of selective area epitaxy (SAE), the use of dots-in-a-well (DWELL) structure as well as the postgrowth technique of QD intermixing (QDI). These methods are essential for achieving high quality quantum dot-based devices and photonic integrated circuits. Finally, we will also present some preliminary results on the investigation of employing QDs to form the so-called intermediate band (IB) structure in solar cells to further improve the efficiency of conventional single gap solar cells.

关键词： Quantum dots Optoelectronic devices Chemical lasers Laser tuning Quantum dot lasers Photovoltaic cells Carrier confinement optical device fabrication Photodetectors Chemical vapor deposition

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optical design of reflective wide-field cameras

Optical design of reflective wide-field cameras

引用

conference on current developments in Lens design and optical engineering IX

作者： Sasian, Jose Univ Arizona Coll Opt Sci Tucson AZ 85721 USA

ISBN: (纸本)9780819472809

This paper discusses some methodologies that apply to the optical design of reflective wide-field cameras. Among the methods considered are off-axis and eccentric pupil systems, concatenation of systems, tilted component systems, aberration theory, and confocal systems. The goal of the paper is to review design methods. In particular some systems are shown to illustrate two methodologies.

关键词： optical design mirror design wide-field reflective optics unobscured

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New tools for the lens designer

New tools for the lens designer

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conference on current developments in Lens design and optical engineering IX

作者： Dilworth, Donald C. Optical Systems Design Inc. (United States)

ISBN: (纸本)9780819472809

Several common impediments to successful lens design can be removed by application of new techniques. These involve using information that has long been calculated during the design process, but then discarded. Problems so addressed include the nuisance of discovering ray failures in the starting configuration, and that of tolerance desensitization, among others.

关键词： Lens optimization ray failures tolerance desensitization starting point stop position avoiding strain

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An optically passive athermal infrared optical system

An optically passive athermal infrared optical system

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conference on current developments in Lens design and optical engineering IX

作者： Li, Hua Shen, Mangzuo Chinese Acad Sci Inst Opt & Elect Chengdu 610041 Sichuan Prov Peoples R China

ISBN: (纸本)9780819472809

An optically passive athermal infrared optical system working in the 8 - 12 micron long wavelength infrared band was designed by using a special infrared optical material AMTIR (amorphous material transmitting infrared radiation). The design principle, design results are described in this paper. In addition, the optical system was incorporated with an infrared focal plane array forming an infrared camera. The thermal test of imaging quality of this camera is also presented

关键词： infrared optical system optical design athermal optical system

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Automated design and fabrication of ocular optics

Automated design and fabrication of ocular optics

引用

conference on current developments in Lens design and optical engineering IX

作者： Gutin, Mikhail Gutin, Olga Appl Sci Innovat Inc Troy NY 12180 USA

ISBN: (纸本)9780819472809

Automated computer-aided procedure for component selection, optical design, and optimization was developed and used to produce prototype ocular optics of a head-mounted display for biomedical imaging, with the field of view and resolution approaching those of normal human vision. The new display has the potential to dramatically increase the amount and fidelity of real-time visual information presented to the user. The selected approach was based on a tiled configuration and "optically stitched" virtual image, resulting in seamless imagery generated by multiple micro-displays. Several optical configurations were studied in the design stage, to arrive at the optimal optical layout. The automated procedure provided for extensive search of the best candidate stock components out of thousands of candidate lenses offered by different vendors. At each iteration, the candidate lens was "digitally inserted" in the optical layout, its position was optimized, and the achieved merit function characterizing the quality of the stitched image was stored, along with the design prescription. A few best designs were then closely evaluated in a traditional "manual" procedure. The design effort was followed by experimental demonstration and tests of a limited prototype optical system.

关键词： optical design lens design head mounted display HMD

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Modeling diffractive optical elements in hybrid systems with the effect of the material dispersion

Modeling diffractive optical elements in hybrid systems with...

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conference on current developments in Lens design and optical engineering IX

作者： Zhang, Hu Liu, Hua Lu, Zhenwu Zhang, Hongxin Ni, Zhengguo Chinese Acad Sci State Key Lab Appl Opt Changchun Inst Opt Fine Mech & Phys Changchun 130033 Peoples R China Chinese Acad Sci Grad Sch Beijing 100039 Peoples R China Aviat Univ Air Force Changchun 130022 Peoples R China

ISBN: (纸本)9780819472809

The diffractive optical element (DOE) is always modeled as an ideal pure diffractive clement which neglects the refractive dispersion of the clement's material. In this paper, a new model of the diffractive optical element is proposed, in which the effect of the refractive dispersion of the DOE's material is considered. The new model is explained and compared with standard diffraction-order expansion with the help of a hybrid system example. The analytical results show that the new model has an important meaning for the exact analysis of the hybrid refractive-diffractive optical system.

关键词： Diffractive optical clement material dispersion hybrid optical systems optical design

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design of a discrete scan laser focusing system with a ring grating scan element

Design of a discrete scan laser focusing system with a ring ...

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conference on current developments in Lens design and optical engineering IX

作者： Rodgers, J. Michael Opt Res Associates Pasadena CA 91107 USA

ISBN: (纸本)9780819472809

An optical system application required a high speed laser scanning subsystem that produced high quality extended images focused at 32 discrete separated positions along a line, rather than continuously varying positions along the line as in more familiar scanning systems. This paper describes the optical design trades and selection of a grating-based scan element that produces this unusual type of scan, and the optical design methods that corrected aberrations produced by the scan element. A variety of different grating-based scan element designs were explored, in a flat disk geometry, but these produced excessive aberrations, both in the absolute level and in the magnitude of variation with scan. A ring-shaped scan element geometry was identified, which greatly minimized the scan-varying aberrations and brought them to near acceptable levels. Additional cylindrical corrector elements were added near the ring scan element to reduce the astigmatism of the ring substrate, and cylindrical lenslets were placed near the focus to provide further independent correction of astigmatism in each scan position. The resulting design achieved diffraction limited wavefront quality across the scan range.

关键词： optical design gratings scanning systems

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design Efficiency of 3188 optical designs

Design Efficiency of 3188 Optical Designs

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conference on current developments in Lens design and optical engineering IX

作者： Cakmakci, Ozan Rolland, Jannick P. Thompson, Kevin P. Rogers, John Univ Cent Florida CREOL Coll Opt & Photon Orlando FL 32816 USA Opt Res Associates Pasadena CA USA

ISBN: (纸本)9780819472809

In this study, we take a data-driven approach to study the design efficiency of a variety of optical designs. Efficiency is defined to be the number of resolvable spots across the image per lens element. 3188 designs were selected from a commercially available lens database. Each design was imported into a raytrace code, briefly optimized, and the number of resolvable spots was computed. Examples of efficient designs within this dataset are shown. Four design efficiency groupings are created and discussed separately: 1) all-spherical, monochromatic designs, 2) monochromatic designs with some aspheres, 3) all-spherical, polychromatic designs, and 4) polychromatic designs with some aspheres. Zoom lens systems were excluded from the dataset. The results of the analysis are intended to answer the question of "how many elements does it take, as a minimum, to deliver a certain number of resolved spots?"

关键词： optical system design efficiency database analysis

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design and fabrication of low-cost thermal imaging optics using precision chalcogenide glass molding

Design and fabrication of low-cost thermal imaging optics us...

引用

conference on current developments in Lens design and optical engineering IX

作者： Curatu, George LightPath Technol Orlando FL 32826 USA

ISBN: (纸本)9780819472809

Aspheric and diffractive surfaces in infrared materials are traditionally fabricated by single point diamond turning, which is a high-cost, low-throughput process, not suitable for low-cost, high-volume applications. Precision molding of chalcogenide glasses is a novel process we developed to allow the efficient fabrication of quality infrared optics in large volumes. In this paper we present the advantages and particularities of designing thermal imaging lenses for high-volume applications using precision molded chalcogenide glasses. As an example, we present a compact 19 mm F/1.1 infrared lens design for a 320 x 240 uncooled detector array operating from 8 to 14 microns. The excellent image quality and transmission of tested prototypes prove that precision molding of chalcogenide glasses is an ideal optical fabrication technology for the high-volume production of infrared optics.

关键词： infrared lens design thermal imaging precision glass molding chalcogenide glasses athermal design diffractive optics

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Day and Night Security Camera

Day and Night Security Camera

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conference on current developments in Lens design and optical engineering IX

作者： Laikin, Milton Kweon, Gyeong-il Choi, Young-ho Laikin Opt Corp 4314 Marina City Dr 930 Marina Del Rey CA 90292 USA Honam Univ Dept Optoelect Gwangju 506090 South Korea Honam Univ Dept Informat & Commun Engn Gwangju 506090 South Korea

ISBN: (纸本)9780819472809

We have designed a fisheye lens with a field of view of 190 degrees and F# of 2.8 The diameter of the circular image plane is designed to fit within the width of the image sensor plane, so that a 190 degrees horizontal field of view can be obtained. It is composed of 8 spherical lens elements and the overall length is 35mm from the first lens surface to the image sensor plane. This fisheye lens operates simultaneously in the visible and the near infrared wavelength regions.

关键词： Lens design near infrared visual wide-angle lens

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