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

共 1426 条记录，以下是1211-1220 订阅

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MATRIX REPRESENTATION OF MULTIMODE BEAM TRANSFORMATION

MATRIX REPRESENTATION OF MULTIMODE BEAM TRANSFORMATION

引用

5TH CONF ON current developments IN optical design AND optical engineering

作者： ALDA, J PORRAS, MA BERNABEU, E Univ. Complutense de Madrid (Spain)

ISBN: (纸本)0819406554

The transformation of laser beams passing through optical systems is analyzed using a TEM modal decomposition. The laser beam is decomposed and the optical system is described by a matrix that relates the modal composition of the input and output beams. The hard aperture and the parabolic and Gaussian soft apertures are given a typical examples. The matrices that characterize these apertures allow analysis of the losses of laser resonators, including finite and/or variable reflectivity mirrors. The modal decomposition is used for defining modified ABCD matrices that include any kind of apertures.

关键词： Resonators Gaussian beams optical design optical engineering Matrices Phase shifts Transmission electron microscopy Laser resonators Lithium Mirrors

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NEW TYPE OF LARGE-ANGLE BINOCULAR MICROTELESCOPES

NEW TYPE OF LARGE-ANGLE BINOCULAR MICROTELESCOPES

引用

5TH CONF ON current developments IN optical design AND optical engineering

作者： LU, KC ZHU, YF KANG, SG Harbin Institute of Technology (China)

ISBN: (纸本)0819406554

A new type of Galilean binoculars is presented. The objective lenses are composed of a cemented doublet and a positive meniscus, and the eyepiece is a negative thick meniscus. In addition, all of the surfaces except the gluing surface are concave toward the eye-side of the system. So the structure is suitable for both increasing the field of view and decreasing the dimensions. It increases the vision angle by 46.5% and reduced the dimensions approx 2.33 times. The characteristics are: the magnifying power, 2.3; the object vision angle, 32 deg when its interpupillary distance is 6 mm, 27,36 deg when its interpupillary distance is 8 mm; the total of the telescope 29 mm; and the full objective aperture, (Phi) 35 mm.

关键词： Telescopes Objectives Eye Image quality Modulation transfer functions Monochromatic aberrations optical engineering Space telescopes optical design Lenses

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TECHNIQUES FOR designING HYBRID DIFFRACTIVE optical-SYSTEMS

TECHNIQUES FOR DESIGNING HYBRID DIFFRACTIVE OPTICAL-SYSTEMS

引用

5TH CONF ON current developments IN optical design AND optical engineering

作者： BROWN, DM PITALO, SK Teledyne Brown Engineering (United States)

ISBN: (纸本)0819406554

The authors analyzed techniques for designing lenses consisting of conventional reflective or refractive elements used in conjunction with binary optical elements (BOEs), and reviewed the use of BOE correctors in systems with both rotational and bilateral symmetry. These systems add a large number of degrees of freedom, such that almost any arbitrary wavefront shape can be obtained. For this reason, automatic optimization with BOEs requires special considerations; especially, tilted or decentered systems, wide-waveband systems, or wide field-of-view systems. If caution is not exercised, one can easily consume large amounts of expensive cpu time only to converge on nonoptimal dead-end solutions. A typical situation that occurs is the convergence upon a solution where the performance is diffraction limited at the finite number of defined field points, but strongly aberrated at field points in between. The key to converging on an optimal solution is the proper use of user defined constraints. The authors studied how to select which BOE coefficients to vary and how to choose field points in order to increase the probability of converging on optimal solutions.

关键词： optical design Cameras Monochromatic aberrations Wavefronts optical engineering Lens design optical components Lenses Chemical elements Diffraction

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design AND FABRICATION OF LARGE FORMAT HOLOGRAPHIC LENSES

DESIGN AND FABRICATION OF LARGE FORMAT HOLOGRAPHIC LENSES

引用

5TH CONF ON current developments IN optical design AND optical engineering

作者： STOJANOFF, CG KUBITZEK, R TROPARTZ, S BRASSEUR, O FROHLICH, K RWTH Aachen (Germany)

ISBN: (纸本)0819406554

Dichromated gelatin layers (DCG) facilitate the design and fabrication of large-format (1 m2) holographic optical elements (HOE) that exhibit high optical quality and diffraction efficiency. The subject matter of this report is the presentation of an optimized design and fabrication technique for the manufacturing of large-format diffractive optics. The emphasis is placed on the realization of homogeneous diffraction efficiency distribution across the aperture of the HOE. The nature of the holographic process requires precise control of the mechanical properties of the DCG layer such as moisture content, shrinking, swelling, hardness, and elasticity of the film, which specify the slant angle, the mean index of refraction, and the amplitude of the refractive index modulation. These properties ensure the attainment of the desired diffraction efficiency, bandwidth, and Bragg-shift. The results achieved in the development and fabrication of such layers are presented and their applicability as holographic solar concentrators is explained. The emphasis is also placed upon the development and realization of a novel copying technique for the batch reproduction and inexpensive manufacturing of large-format transmissive holograms that are used as focusing lenses in solar concentrators.

关键词： Holograms Holography Diffraction optical design Diffraction gratings Glasses Holographic optical elements Modulation Lenses Mirrors

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DEVELOPMENT OF HIGH-SPEED HIGH-PRECISION LASER PLOTTER

DEVELOPMENT OF HIGH-SPEED HIGH-PRECISION LASER PLOTTER

引用

5TH CONF ON current developments IN optical design AND optical engineering

作者： TACHIHARA, S MIYOSHI, T Asahi Optical Co. Ltd. 2-36-9 Maenocho Itabashi Tokyo 174 Japan

ISBN: (纸本)0819406554

A high-speed, high-precision laser plotter which is called Super Laser Photo Plotter, or S-LPP has been developed. S-LPP has a flat table so that both photographic plates and films can be used, and is capable of writing fine patterns for print circuit boards(PCBs), lead frames for IC, and so on over the area of 640mm X 819mm, with a minimum line width of 10μm, in 60 minutes. It has achieved more than fifty times faster speed than that of a conventional plotter which has almost the same specifications as S-LPP. Several important optical techniques that have given S-LPP its own features are described. © 1991 SPIE. All rights reserved.

关键词： Photographic films

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PLASTIC LENS ARRAY WITH THE FUNCTION OF FORMING UNIT MAGNIFICATION ERECT IMAGE USING ROOF PRISMS

PLASTIC LENS ARRAY WITH THE FUNCTION OF FORMING UNIT MAGNIFI...

引用

5TH CONF ON current developments IN optical design AND optical engineering

作者： TAKAHASHI, E TANJI, S TANAKA, A HAYASHI, Y Fujitsu Ltd. (Japan)

ISBN: (纸本)0819406554

An original plastic-lens array molded integrally as one block having a function of forming a unit-magnification erect image has been developed. The lens array consists of eight lens devices. The lens device has a roof prism, a reflecting v-groove, and a pair of convex-lens surfaces. A prototype of the lens arrays are arranged side by side. Thickness of the lens array is 4.5 mm, distance between object and image planes is 14.4 mm, array pitch is 1.3 mm, and the effective imaging region is 220 mm. The average modulation transfer function (MTF) at 41 p/mm of the lens array is 76% in the row direction (Y-direction) and 80% in the direction (X-direction) normal to Y-direction. The average F/NO in line-scanning is 1.8. The average irradience unevenness in line-scanning is 17%. The focal depth is +/- 0.6 mm in the area with the MTF being 60% or more. With this prototype a high-resolution image was attained. So, the lens arrays can be applied to imaging devices for use in a compact facsimile, image scanner, LED printer, and so on.

关键词： optical engineering Prisms Prototyping Modulation transfer functions optical design Lens design Fringe analysis Imaging arrays Imaging devices Scanners

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HIGH-PERFORMANCE 400DPI-A4-SIZE CONTACT IMAGE SENSOR (CIS) MODULE FOR SCANNER AND G4-FAX APPLICATIONS

HIGH-PERFORMANCE 400DPI-A4-SIZE CONTACT IMAGE SENSOR (CIS) M...

引用

5TH CONF ON current developments IN optical design AND optical engineering

作者： YEH, LC WU, WC TANG, RS TSAI, YS CHIANG, E CHIAO, P CHU, CL WANG, WL Dyna Image Corp. (United States)

ISBN: (纸本)0819406554

Recent development ofG4 fax and scanner requires a high speed, high resolution, and high contrast second generation image sensor. This paper describes a silicon butting Contact Image Sensor (CIS) module which has been developed and produced to solve the problems encountered by using CCD image sensors. Due to the flexibility ofthe design, the CIS module can be made for the A6, A4 ,B4 or other paper sizes. This device can be operated at high speed (2 MHz or higher), high dynamic range (1000: 1) and high resolution (400DPI). By adding alayer ofcolor filter on top of the photosensor, it is also applicable for the color G4 facsimile and color scanner.

关键词： Image sensors Phototransistors Sensors Scanners Light emitting diodes Modulation transfer functions optical engineering Photodetectors optical design Silicon

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optical design of a high power fiber optic coupler

Optical design of a high power fiber optic coupler

引用

current developments in optical design and optical engineering 1991

作者： Edward English, R. Halpin, John M. House, F. Allen Paris, Robert D. Lawrence Livermore National Laboratory P. O. Box 808 LiyermoreCA94550 United States

We describe specifications, design, and operation of an optical system that couples a high-power copper vapor laser beam into a large core, multimode fiber. The approach used and observations reported are applicable t... 详细信息

关键词： Multimode fibers

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BRIGHTNESS ENHANCEMENT OF SOLID-STATE LASER-OSCILLATORS IN SINGLE-MODE LASING USING NOVEL INSIDE-RESONATOR optical-ELEMENTS WITH RADIALLY VARIABLE TRANSMISSION

BRIGHTNESS ENHANCEMENT OF SOLID-STATE LASER-OSCILLATORS IN S...

引用

5TH CONF ON current developments IN optical design AND optical engineering

作者： LUKISHOVA, SG MENDEZ, NRM TERMIKIRTYCHEV, VV TULAJKOVA, TV Institute of Radioengineering and Electronics (Russia) Hospital Lima Peru (Peru) Institute of General Physics (Russia)

ISBN: (纸本)0819406554

The results of intracavity application of soft or apodized apertures (AA) with smooth transmission profiles decreasing from the center to the edges are presented. Photooxidation (PhO) AA, made of CaF2:Pr crystals were used. The approximately 3-4 mm diameter of PhO AA with bell-like transmission profiles as placed inside the 2.94 micrometers and 1.06 micrometers resonators of master oscillators. The tendency of the order of magnitude of 1.3 - 1.8 times increasing in output energy and diminishing in beam divergence in single-mode lasing as compared with hard-edge aperture have been observed in the experiment described.

关键词： Oscillators Resonators Crystals Mirrors Physics Reflectivity optical components Absorption Nd:YAG lasers Solid state lasers

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ONLINE RAPID TESTING OF optical TRANSFER-FUNCTION

ONLINE RAPID TESTING OF OPTICAL TRANSFER-FUNCTION

引用

5TH CONF ON current developments IN optical design AND optical engineering

作者： XIANG, CX XIANG, Y Changchun Institute of Optics and Fine Mechanics Academia Sinica China

ISBN: (纸本)0819406554

A new simple method for on-line rapid testing of the optical transfer function (OTF) of camera lenses has been developed, in which the digital fast Fourier transform method is employed with using a linear array CCD for sampling the linear spread function (LSF) of the lens under test. The main advantage of our new method is that test of off-axis OTF need not to rotate the lens under test or the collimator. Obviously, this method is different from the present complicated test methods. Therefore, this method is simple and easy to accomplish on-line automatic test of OTF. The time required for testing nine-position OTF such as on-axis, ±0.7 and±l viewfields in both meridional and sagittal plane is less than 2-3 minutes. We also have established an OTF testing formula relative to the testing factors. Based on it, the testing accuracy of OTF is discussed with the idea of relative accuracy for the first time. The theoretical results are agreement with the experiments. Precision is 1-2%. The relative errors of both the modulation transfer function (MTF) and phase transfer function (PTF), which change with spatial frequency f, are about 10% and 3% at f=50c/mm, respectively. © 1991 SPIE. All rights reserved.

关键词： optical transfer function

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