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

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optical Systems for Large-aperture Phased Laser Array Including Diffractive Optics 20

Optical Systems for Large-aperture Phased Laser Array Includ...

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conference on current developments in Lens design and optical engineering XX

作者： Erlikhman, Jacob Krogen, Peter Srinivasan, Prashant Hettel, Will Meinhold, Peter Lubin, Philip Univ Calif Santa Barbara Dept Phys Broida Hall Santa Barbara CA 93106 USA

ISBN: (数字)9781510629028

ISBN: (纸本)9781510629028

Directed energy propulsion for interstellar travel has been proposed as an ideal method for reaching appreciable speeds relative to the speed of light: 0.2c. However, the amount of energy required necessitates a large aperture, on the order of kilometers, while mitigation of atmospheric perturbations requires a discretization of the aperture into many individual laser elements. The use of fiber lasers for these elements obligates mode-matching the fiber to the desired 10 cm aperture for a collimated beam. Various collimation systems were designed and compared. A 3-lens system with one achromat and two aspheric lenses, with two of the lenses used as a Keplerian telescope to achieve a system-shortening effect was analyzed. A similar system made with a plano-convex lens replacing the large-aperture aspheric lens with two additional compensating lenses was compared. A single diffractive optic operating at F/8 was likewise considered. The optical performance of these systems was compared, as was the cost-effectiveness. Scalability to millions of elements was required, so cost-per-system was a crucial consideration factor. Possible manufacturing processes for a diffractive system were investigated, and stamping processes for replication were analyzed to determine the possibility of replication of such an optic reliably, cheaply, and with acceptable results.

关键词： Directed energy optical design diffractive optical elements corrective optical elements laser propulsion

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The design of microscopic system using zoom structure with a fixed magnification and the independency on the variation of object distance

The design of microscopic system using zoom structure with a...

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conference on current developments in Lens design and optical engineering V

作者： Ryu, JM Jo, JH Jung, JH Chun, YS Kang, GM Hannam Univ Sch Nat Sci Taejon 306791 South Korea

ISBN: (纸本)0819454613

The multi-configurative microscopic system for inspecting the wire-bonding of reed frame is designed. Object rays is nearly collimated by a objective lens group which is a common lens group of x2 and x6 imaging lens systems and is splitted by two beam-splitters composed of a penta-prism and a refracting prism. And object rays started from the central region and the boundary region(reed frame region) on semiconductor chip(that is, the object) are imaged at the two different imaging planes by x2 and x6 imaging lens groups, respectively. The x6 imaging lens system with a constant object distance and a constant magnification is well designed by general imaging optics system design method. However, since the depth of wire structure on the reed frame has about +/-3 mm, in order to observe by a constant magnification and at a fixed imaging plane without the dependency on the variation of objective distance generated by the depth of wire structure on the reed frame, the imaging lens system is composed of two separated groups, which should be moved along nonlinear locus like mechanically compensated zoom lenses. The nonlinear equations for zoom locus are derived by using the Gaussian bracket. Refraction powers and positions of each groups are numerically determined by solving the equations, and initial design data for each groups is obtained by using Seidel third order aberration theory. The optimization technique is finally utilized to obtain this multi-configurative microscopic system.

关键词： lens design equivalent lens imaging system microscopic system multi-configurative system

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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 ...

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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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Proceedings of SPIE - The International Society for optical engineering

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

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1980 International Lens design conference

The proceedings contain 68 papers. The topics discussed include: distributed computing for optical design;current status of the synthesis of optical systems (SYNOPSYS) lens design program;new developments in CODE V optimization;optical design programs at imperial college;optical design using small dedicated computers;dedicated minicomputers in optical design;consideration for minicomputer applications to large optical design programs;microcomputers and optical design;easy to use optical program for commodore PET computer;new approach to the optimization of lens systems;ten years of lens design with Glatzel's adaptive method;aberration balancing criterion for nondiffraction-limited lenses;and application of Zernike polynomial lens sensitivity program ZEST to optimizing a lens design.

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Fielding of an imaging VISAR diagnostic at the National Ignition Facility (NIF)

Fielding of an imaging VISAR diagnostic at the National Igni...

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conference on current developments in Lens design and optical engineering V

作者： Malone, RM Bower, JR Capelle, GA Celeste, JR Celliers, PM Frogget, BC Guyton, RL Kaufman, MI Lare, GA Lee, TL MacGowan, BJ Montelongo, S Ng, EW Thomas, TL Tunnell, TW Watts, PW Bechtel Nevada Los Alamos NM 87544 USA Lawrence Livermore Natl Lab Livermore CA 94551 USA

ISBN: (纸本)0819454613

The National Ignition Facility (NIF) requires diagnostics to analyze high-energy density physics experiments. As a core NIF early light diagnostic, this system measures shock velocities, shock breakout times, and shock emission of targets with sizes from I to 5 mm. A 659.5 nm VISAR probe laser illuminates the target. An 8-inch-diameter fused silica triplet lens collects light at f/3 inside the 33-foot-diameter vacuum chamber. The optical relay sends the image out an equatorial port, through a 2-inch-thick vacuum window, and into two VISAR (Velocity Interferometer System for Any Reflector) interferometers. Both streak cameras and CCD cameras record the images. Total track is 75 feet. The front end of the optical relay can be temporarily removed from the equatorial port, allowing for other experimenters to use that port. The first triplet can be no closer than 500 mm from the target chamber center and is protected from debris by a blast window that is replaced after every event. Along with special coatings on the mirrors, cutoff filters reject the NIF drive laser wavelengths and pass a band of wavelengths for VISAR, for passive shock breakout light, or for thermal imaging light (bypassing the interferometers). Finite Element Analysis was performed on all mounting structures. All optical lenses are on kinematic mounts, so that the pointing accuracy of the optical axis can be checked. A two-color laser alignment scheme is discussed.

关键词： VISAR optical relay interferometer National Ignition Facility (NIF) streak camera

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design of nano-pattern reflectors for thin-film solar cells based on three-dimensional optical and electrical modeling 4

Design of nano-pattern reflectors for thin-film solar cells ...

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conference on Physics, Simulation, and Photonic engineering of Photovoltaic Devices iv

作者： Hsiao, H. H. Chang, H. C. Wu, Y. R. Natl Taiwan Univ Grad Inst Photon & Optoelect Taipei 10617 Taiwan

ISBN: (纸本)9781628414486

The optical and electrical properties of a photonic-plasmonic nanostructure on the back contact of thin-film solar cells were investigated numerically through the three-dimensional (3D) finite-difference time-domain method and the 3D Poisson and drift-diffusion solver. The focusing effect and the Fabry-Perot resonances are identified as the main mechanisms for the enhancement of the optical generation rate as well as the short circuit current density. However, the surface topography of certain nanopattern structures is found to reduce the internal electrostatic field of the device, thus limiting charge collection. The optimized conditions for both optics and electronics have been analyzed in this paper.

关键词： Thin-film solar cells nanostructure amorphous silicon

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Development of a three-channel SWIR camera, for ground-based astronomical imaging. Two Micron All Sky Survey, 2MASS 6

Development of a three-channel SWIR camera, for ground-based...

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current developments in optical design and engineering VI conference

作者： Milligan, S Cranton, BW Skrutskie, MF Telic Optics Inc. (United States) Univ. of Massachusetts/Amherst (United States)

ISBN: (纸本)0819422517

The Two Micron All Sky Survey (2MASS) project, currently underway, requires a camera mated to a 1.3 meter Cassegrain telescope that will simultaneously image the J, H and Ks spectral bands onto three separate NICMOS3 HgCdTe detector arrays. Dichroic beamsplitters allow the three FPA's to view the same field simultaneously. This paper reviews the development of this camera, presents a detailed analysis of the optical design, and discusses the techniques used to align the instrument and evaluate its performance. The low irradiance of astronomical sources, combined with background limited performance of the detectors, mandated a reimaging configuration and the enclosure of the camera optics within the cold volume. Correcting chromatic aberrations, and minimizing ghost images were additional challenges imposed by program requirements. The key to achieving high performance was found to be the selection of lens materials. The final F/3.5 optical design uses fifteen CaF2 elements and four Infrasil elements in an all-spherical configuration. The design is diffraction limited over the full format in the Ks spectral band, and is nearly so in the J and H bands. The tolerance environment is benign, making the design well suited for use in a cryogenic environment. A single channel prototype has been built and extensively field tested at the 50-inch telescope at Kitt Peak National Observatory. Each channel in the multi-spectral camera uses the same optical design successfully demonstrated in the prototype. currently, the first of two three-channel cameras is undergoing lab tests for image quality and channel registration.

关键词： near infrared optical design astronomical imaging chromatic aberration cryogenic camera 2MASS sky survey

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design of compact fisheye lens with slope-constrained Q-type aspheres

Design of compact fisheye lens with slope-constrained Q-type...

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conference on current developments in Lens design and optical engineering Xiv

作者： Xu, Chen Cheng, Dewen Song, Weitao Wang, Yongtian Wang, Qingfeng Beijing Inst Technol Sch Optoelect Beijing 100081 Peoples R China

ISBN: (纸本)9780819496911

Two types of fisheye lenses for automobile navigation are designed with slope-constrained Q-type aspheres. Special requirements have been considered in the design process, and Q-type surfaces are introduced by converted from other kinds of aspheric description with only coefficients of low-order terms retained. A possible problem of imaging the first surface onto the sensor has also been analyzed. As a result, as for the six-element fisheye lens, MTF is greater than 0.3 at 45lp/mm, f-theta distortion is less than 0.03 when the focal length is calibrated, field of view is 230 degrees and full field relative illumination is greater than 0.4. For the four-element fisheye lens, MTF is greater than 0.4 at 45lp/mm, f-theta distortion is less than 0.16, field of view is 190 degrees and full field relative illumination is greater than 0.6. The design results show that the Q-type surfaces employed in fisheye lenses can make the system more compact, lightweighted and easier to manufacture.

关键词： fisheye lens Q-type asphere distortion evaluation tolerance analysis image quality analysis

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High speed and high definition technology by multi-beam scanning in laser printing

High speed and high definition technology by multi-beam scan...

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conference on current developments in Lens design and optical engineering II

作者： Hayashi, Y Amada, T Ricoh Co Ltd Ricoh Imaging Technol Div Tokyo Japan

ISBN: (纸本)0819441554

Multi-beam scanning is the effective method for high speed and high definition in Laser Printing, and there are three systems for this method as fellows. 1) Laser Diode (LD) Array system 2) System for dividing a single light source 3) System for combining beams of multiple LDs by optical devices Each of these systems has both advantage and disadvantage, and which one to use among these three depends on application requirements. The third system above allows for the use of conventional LDs and therefore it is low cost and offers a large degree of freedom in selecting light sources. We have already developed a Two LD Prism-based Light Source Unit that uses a C, prism to combine the beams emitted by two LDs. This system achieves stable optical characteristics with any conventional scanning optical elements. We have further enhanced this system. We have determined an optimum design that includes scanning lens and have developed the Two LD Beam-crossing Light Source Unit which performs multi-beam scanning using two LDs without a prism. In this paper, we report on recent multi-beam-scanning technologies and introduce our newly developed the Two LD Beam-crossing Light Source Unit.

关键词： Light sources optical scanning systems Mirrors Prisms Monochromatic aberrations Nonimpact printing optical components optical fibers Temperature metrology Semiconductor lasers

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Wide Band Transimpedance Amplifier using Class AB FVF 3

Wide Band Transimpedance Amplifier using Class AB FVF

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3rd International conference on Recent developments in Control, Automation and Power engineering (RDCAPE)

作者： Singh, Nidhi Niranjan, Vandana Indira Gandhi Delhi Tech Univ Women Dept Elect & Commun Engn New Delhi India

ISBN: (纸本)9781728120683

CMOS technologies have swiftly ameliorated across the past few years. To meet the demand of high performance applications like compact disc players, high definition television (HDTV), radar, medical imaging etc., this employs info conversion system for processing at later stages. Accuracy is highly desirable in many functional systems like optical communication, military surveillance etc. In optical communication system, transimpedance amplifier (TIA) is the fundamental part of optical receiver which is required to convert the low level current signal from the photodiode to an operable output voltage for further processing. Here in this paper, we propose a CMOS TIA using class-AB flipped voltage follower having less output resistance. Simulation results of the proposed circuit in 0.18 mu m technology depicts that the bandwidth and the transimpedance gain obtained are increased by 3.3 times and 1.03 times respectively.

关键词： Flipped voltage follower (FVF) optical Receiver Transimpedance amplifier (TIA) low voltage low power design

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