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

共 444 条记录，以下是141-150 订阅

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Studying the back-scattering of light for the development of acousto- optical filter with an improved spectral resolution 17

Studying the back-scattering of light for the development of...

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conference on current developments in lens design and optical engineering XVII

作者： Shcherbakov, Alexandre S. Arellanes, Adan Omar Chavushyan, Vahram Natl Inst Astrophys Opt & Elect INAOE Luis Enrique Erro 1 AP 51 & 216 Puebla 72000 Mexico

ISBN: (数字)9781510602861

ISBN: (纸本)9781510602854;9781510602861

We consider the collinear backward light scattering as one of potential physical mechanisms for creating an advanced collinear acousto-optical filter with significantly improved spectral resolution. Within co-directional crystalline collinear acousto-optical filters, the resolution is inversely proportional to the material's birefringence, which is similar to 0.1 in the best case of LiNbO3-crystal. For the backward light scattering this parameter is replaced by the twice refractive index, so that the gain achieves > 45 times in LiNbO3-crystal. Thus, one can expect the resolution similar to 0.002 angstrom instead of the val similar to 0.1 0.2 recently obtained by us experimentallor co-directional geometry in that crystal. Moreover, the collinear backward light scattering can be implemented in an extended amount of available materials. However, the main limitation for applying the phenomenon is the acoustic attenuation in ultra-high frequency range peculiar to the materials for acousto-optical filters. Linear acoustic attenuation reduces the length of acousto-optical interaction and limits the spectral resolution. At an initial stage, our studies are concentrated on physical aspects of this phenomenon as well as on possibilities of its application to creating the acousto-optical filters of a high resolution. In particular, the frequency band-shapes of the scattered light intensity exhibit a tendency to specific acousto-optical nonlinearity, i.e. to more and more rectangular profile as the acoustic power density grows. Results of this analysis confirm the above-noted estimations for a triplet of trigonal acousto-optical crystals, having possibly lower acoustic attenuation.

关键词： acousto-optics collinear acousto-optical filter backward light scattering improved spectral resolution astrophysical applications

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Tolerancing an optical freeform surface: an optical fabricator's perspective 16

Tolerancing an optical freeform surface: an optical fabricat...

引用

conference on current developments in lens design and optical engineering XVI

作者： Nelson, Jessica DeGroote Medicus, Kate Frisch, Gregory Optimax Syst Inc Ontario NY 14519 USA

ISBN: (纸本)9781628417449

Freeform optical shapes or optical surfaces that arc designed with non-symmetric features arc gaining popularity with lens designers and optical system integrators. Tolerances on a freeform optical design influence the optical fabrication process. Case studies and soft tolerance limits for easier fabrication will be discussed. This paper will also give a high level overview of a freeform optical fabrication process that includes generation. high speed VIBE polishing, sub-aperture figure correction and testing of freeform surfaces.

关键词： Freeform optics manufacturing tolerance fabrication asphere

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Recent experience with design and manufacture of cine lenses 16

Recent experience with design and manufacture of cine lenses

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conference on current developments in lens design and optical engineering XVI

作者： Thorpe, Michael D. Dalzell, Kristen E. Raytheon ELCAN Opt Technol Midland ON Canada

ISBN: (纸本)9781628417449

Modern cine lenses require a high degree of aberration correction over a large and ever expanding image size. At low to medium volume production levels, these highly corrected designs also require a workable tolerance set and compensation scheme for successful manufacture. In this paper we discuss the design and manufacture of cine lenses with reference to current designs both internal and in the patent literature and some experience in design, tolerancing and manufacturing these lenses in medium volume production.

关键词： lens design compensators manufacturability cine

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Ultra-compact hourglass lens for integrated cameras 16

Ultra-compact hourglass lens for integrated cameras

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conference on current developments in lens design and optical engineering XVI

作者： Rezaei, Mohsen Nia, Iman Hasani Bonakdar, Alireza Mohseni, Hooman Northwestern Univ Dept Elect Engn & Comp Sci Bioinspired Sensors & Optoelect Lab BISOL Evanston IL 60208 USA

ISBN: (纸本)9781628417449

An ultra-small telecentric lens with sub-millimeter thickness is proposed. This lens with 0.2 numerical aperture and high field of view is a good candidate to be used in multi-aperture super resolution imagers. Point spread function and the telecentricity of the lens is extracted numerically and measured experimentally. The ray-optics simulation results show nearly diffraction limited performance for the lens.

关键词： Cameras Imaging systems Point spread functions Silicon Image sensors lens design Infrared cameras Modulation transfer functions Super resolution Sensors

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Analysis of three-element zoom systems for laser beam expanders with tunable-focus lenses 16

Analysis of three-element zoom systems for laser beam expand...

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conference on current developments in lens design and optical engineering XVI

作者： Kulmon, Pavel Miks, Antonin Novak, Pavel Novak, Jiri Czech Tech Univ Fac Civil Engn Dept Phys Prague 16629 Czech Republic

ISBN: (纸本)9781628417449

Our work is focused on the problem of a theoretical analysis of imaging properties and an initial optical design of a three-element zoom optical system for laser beam expanders using lenses with a tunable focal length. Equations that enable to calculate basic paraxial properties and parameters of such optical systems are derived Finally, the derived equations are applied on an example of calculation of parameters of the three-element zoom system for the laser beam expander.

关键词： geometric optical design first-order optics zoom lenses laser beam expander Gaussian beam tunable-focus lenses

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Simulation of the optical performance of refractive elements to mimic the human eye focusing 16

Simulation of the optical performance of refractive elements...

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conference on current developments in lens design and optical engineering XVI

作者： Diaz-Gonzalez, G. Santiago-Alvarado, Agustin Cruz-Felix, Angel S. Univ Tecnol Mixteca Huajuapan De Leon 69000 Oax Mexico

ISBN: (纸本)9781628417449

Refractive optics has evolved and incorporated new elements in optical systems every day, such as conventional lenses, tunable lenses, GRIN lenses, diffractive lenses, intraocular lenses, etc. Some of these elements are reported in the literature together with different proposed models of the human eye. In this work, optical properties of some of these lenses will be studied, and simulations of their behavior will be done in order to analyze which one is better for imaging process. Such lenses will be incorporated in an optical system that mimics the human eye behavior. Analysis and obtained results are reported, as well as the proposed optical system. Finally, we present the conclusions of the work.

关键词： visual optics geometric optics matrix optics tunable lenses

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Testing and alignment of freeform based multi-mirror telescopes 16

Testing and alignment of freeform based multi-mirror telesco...

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conference on current developments in lens design and optical engineering XVI

作者： Zhang, Xue-jun Hu, Hai-xiang Xue, Dong-lin Li, Ming Chinese Acad Sci Changchun Inst Opt & Fine Mech & Phys Changchun 130033 Jilin Peoples R China Univ Chinese Acad Sci Beijing 100049 Peoples R China

ISBN: (纸本)9781628417449

Three Mirror Anastigmat (TMA) systems including both on-axis and off-axis configurations have been widely used in space applications. In some designs, to correct for high order aberrations and realize large FOV, freeform surfaces are used to provide more design freedoms. This trend brings challenges to optical manufacturing and testing community Since testing is critical to make high accurate aspheres and freeform surfaces, the paper addressed Computer Generated Hologram (CGH) design and implement to measure large freeform mirrors. In particular, CGH assisted alignment procedure for TMA telescopes were discussed in detail.

关键词： TMA freeform mirror CGH testing optical alignment

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Integration design of rigid endoscope with different viewing angles 16

Integration design of rigid endoscope with different viewing...

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conference on current developments in lens design and optical engineering XVI

作者： Zhang, Lingyun Cheng, Dewen Wang, Yongtian Beijing Inst Technol Sch Informat Sci & Technol Dept Optoelect Engn Beijing 100081 Peoples R China

ISBN: (纸本)9781628417449

High definition and magnification rigid endoscope is a significant equipment in the examination and surgery. In this paper, the design of a high definition (HD) rigid endoscope with zero viewing direction is presented with a FOV of 70. The entrance pupil is 0.3 mm, achieved for the first time to our best knowledge. For the fabricated prototype, the theoretical resolution is 22.3 lp/mm at an object distance of 20 mm, and the depth of field (DOF) is 115 mm The performance is proved to be great for observation during diagnosis and surgery. Besides, the endoscope with non-zero viewing direction is more needful in some conditions such as observing and diagnosing lesions on inner walls of organs and tissues. In this paper, we present two designs with non-zero viewing direction for better applications.

关键词： optical design rigid endoscope high definition depth of field stray light

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Comparison of Geometrical and Diffraction optical Transfer Functions 16

Comparison of Geometrical and Diffraction Optical Transfer F...

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conference on current developments in lens design and optical engineering XVI

作者： Mahajan, Virendra N. Antonio Diaz, Jose Univ Arizona Coll Opt Sci Tucson AZ 85721 USA Univ Granada Dept Opt E-18071 Granada Spain

ISBN: (纸本)9781628417449

The geometrical and diffraction point-spread functions of an optical imaging system have been reviewed and compared in the past [V. N. Mahajan, "Comparison of geometrical and diffraction point-spread functions," SPIE Proc. 3729, 434-445 (1999)]. In this paper, we review and compare its corresponding optical transfer functions. While the truth lies with the diffraction OTF, it is considered easier and quicker to calculate the geometrical Oil, especially for large aberrations. We briefly describe the theory of the two OTFs, and explore the range of spatial frequencies and the magnitude of the primary aberrations over which the geometrical OTF may provide a reasonable approximation of the diffraction OTF.

关键词： optical transfer functions Monochromatic aberrations Spatial frequencies Diffraction Actinium Imaging systems Geometrical optics optical imaging Modulation transfer functions Fourier transforms

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Landsat-swath Imaging Spectrometer design 16

Landsat-swath Imaging Spectrometer Design

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conference on current developments in lens design and optical engineering XVI

作者： Mouroulis, Pantazis Green, Robert O. Van Gorp, Byron Moore, Lori Wilson, Daniel W. Bender, Holly A. CALTECH Jet Prop Lab Pasadena CA 91109 USA

ISBN: (纸本)9781628417449

We describe the design of a high-throughput pushbroom imaging spectrometer and telescope system that is capable of Landsat swath and resolution while providing better than 10 nm per pixel spectral resolution. The design is based on a 3200 x 480 element x 18 mu m pixel size focal plane array, two of which are utilized to cover the full swath. At an optical speed of F/1.8, the system is the fastest proposed to date to our knowledge. The utilization of only two spectrometer modules fed from the same telescope reduces system complexity while providing a solution within achievable detector technology. Predictions of complete system response are shown. Also, it is shown that detailed ghost analysis is a requirement for this type of spectrometer and forms an essential part of a complete design.

关键词： Imaging spectrometer Landsat Dyson spectrometer

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