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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91-100 订阅

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Passive athermalization of MWIR optical designs utilizing different infrared optical materials 23

Passive athermalization of MWIR optical designs utilizing di...

引用

conference on current developments in lens design and optical engineering XXIII Part of SPIE Optics and Photonics conference

作者： Kucukcelebi, Doruk Aydemir, Sukru Emre Roketsan Kemalpasa Mahallesi Sehit Yuzbasi Adem Kutlu Soka TR-06780 Ankara Turkey

ISBN: (纸本)9781510654198;9781510654181

In this paper, different optical designs, which are composed of different MWIR optical materials, are utilized for passive athermalization and their performance in athermalization are analyzed. The optical designs are carried out by preserving the athermal property as well as keeping the image quality at higher levels within the working temperature between -40 degrees C and +60 degrees C. The passive athermalization process begins with the calculation of athermalization conditions of candidate material properties. By considering these conditions, athermal material pairs are chosen. To reduce optical aberrations, aspherical surfaces are utilized during the optimization process. At the end of the design phase, the performance of different configurations of athermal optical material pairs, which are enclosed by aluminum alloy housing material, are presented.

关键词： Athermalization infrared optical design optical material pair Mid Wave Infrared (MWIR)

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Reflaxicon objectives for imaging

Reflaxicon objectives for imaging

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conference on current developments in lens design and optical engineering XIII

作者： Nadorff, Georg DeWitt, Frank CVI Melles Griot Rochester NY 14620 USA

ISBN: (纸本)9780819492036

We introduce a novel application of reflective axicon surfaces to high performance image-forming objectives. The reflective surfaces are arranged such that the optical and mechanical axes are collinear, yet have the potential to provide unobscured transmission. Offering the ability to compete with the performance of traditional diffraction-limited unobscured optical systems provides a design and fabrication alternative where demanding optical requirements must be met. There are four possible arrangements for construction, with the two outer reflectors always being concave and the two inner reflectors being either concave or convex. Multitudes of novel design forms are explored. We describe monolithic and two-piece solid, two- and three-piece reflective, and two- piece hollow-solid hybrids. We analyze the performance of such designs and compare to the performance of both refractive and reflective systems.

关键词： reflective axicon lens forms objective Schwarzschild obscuration-free obscured long working distance

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Saddle points in the merit function landscape of systems of thin lenses in contact

Saddle points in the merit function landscape of systems of ...

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conference on current developments in lens design and optical engineering V

作者： Bociort, F Serebriakov, A van Turnhout, M Delft Univ Technol Opt Res Grp NL-2628 CJ Delft Netherlands

ISBN: (纸本)0819454613

The merit function landscape of systems of thin lenses in contact, which are perhaps the simplest possible types of optical systems, shows remarkable regularities. It is easier to understand how the optimization parameter space of these simple systems is divided into basins of attraction for the various local minima if one focuses on the (Morse index 1) saddle points in the landscape rather than on the local minima themselves. The existence and the basic properties of these saddle points can be predicted by thin-lens theory, which is applied on a simplified model of the merit function containing only third-order spherical aberration. The predictions of this simplified model are confirmed by numerical results obtained with a typical merit function based on ray tracing.

关键词： global optimization saddle points thin lens theory spherical aberration optical system design

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Consumer Electronic Optics: How Small a lens Can Be Using Metasurfaces 20

Consumer Electronic Optics: How Small a Lens Can Be Using Me...

引用

conference on current developments in lens design and optical engineering XX

作者： Thibault, Simon Univ Laval Ctr Opt Photon & Lasers COPL Quebec City PQ Canada Immervis Inc Montreal PQ Canada

ISBN: (数字)9781510629028

ISBN: (纸本)9781510629028

Miniature optics are used in many applications and particularly in consumer optics for such products as webcams, mobile phones, automotive components, endoscopes, tablets, and many other connected devices. Mobile phone cameras are probably the ones that have driven the race for shorter TTL over the past 10 years. Ten years ago, cell phone cameras were composed of 3-4 optical plastic elements within one camera lens;today it takes more than 6 optical elements to obtain mega pixel resolution. But it is still not enough. The market has an insatiable appetite for greater optical performance. Consequently, the lens system has become more complex and now may require more optical elements with more complex optical functions. In this context, can the metasurface lens play a role? In this paper, we will try to address this question and discuss how metasurfaces promise to become a game changer in the consumer electronics market.

关键词： lens design Metasurface Dielectric Nanofin Aberration Cell Phone Camera Phone

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Caustic surface of a plane wavefront refracted by a smooth arbitrary surface 15

Caustic surface of a plane wavefront refracted by a smooth a...

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conference on current developments in lens design and optical engineering XV

作者： Avendano-Aleja, Maximino Univ Nacl Autonoma Mexico Ctr Ciencias Aplicadas & Desarrollo Tecnol Mexico City 04510 DF Mexico

ISBN: (纸本)9781628412192

We study the formation of caustic produced by smooth arbitrary surfaces considering a plane wavefront propagating parallel to the optical axis and impinging on the refracting surface. We have already seen that the shape of the caustic surface can represent the monochromatic aberrations that we call image errors, furthermore the shape of the caustic can be modified by changing the parameters of the lens in such a way that if the caustic surfaces is vanished the optical system produces a perfect image, on the other hand for a caustic possessing a large area it could be applied to design no-imaging optical systems. The shape of the caustic depends only on the indices of refraction involved in the process of refraction, the refracting surface which is formed by smooth arbitrary plano-convex lens. We provide an analytic equation for the caustic surface after refraction of a plane wave from every rotationally symmetric surface.

关键词： Refraction Aspheric lenses Wavefronts Ray tracing optical design Geometrical optics Monochromatic aberrations Light Radon Wave propagation

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optical design of LED Marine Beacons 19

Optical Design of LED Marine Beacons

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19th conference on current developments in lens design and optical engineering

作者： Lin, Shih-Kang Jen, Yung-Chang Lee, Xuan-Hao Yu, Yeh-Wei Yang, Tsung-Hsun Sun, Ching-Cherng Natl Cent Univ Dept Opt & Photon Chungli 32001 Taiwan Natl Cent Univ Opt Sci Ctr Taoyuan 32001 Taiwan

ISBN: (数字)9781510620629

ISBN: (纸本)9781510620629

Two optical designs for marine beacon based on Direct In-line Package (DIP) LED is proposed and demonstrated. The luminous intensity of the marine beacon using DIP LED can achieve to the IALA recommendation's requirement of 5 nautical miles. The measurement of color coordinates can also fit the IALA recommendation's requirement. By the surface-structured TIR lens, we successfully keep the divergence angle to 68 degrees in the horizontal direction and converge to 8 degrees in the vertical direction.

关键词： DIP LED optical design marine beacons IALA

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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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Development of methods for accurate modeling of optical equipment for three-dimensional printing 17

Development of methods for accurate modeling of optical equi...

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conference on current developments in lens design and optical engineering XVII

作者： Saitgalina, A. K. Tolstoba, N. D. Mitiushkin, A., V ITMO Univ Dept Appl & Comp Opt Kronverksky Ave 49 St Petersburg 197101 Russia

ISBN: (数字)9781510602861

ISBN: (纸本)9781510602854;9781510602861

The task of this research project is to define the extent of applicability of such 3D self-manufacture approach to the production of optical fastenings. The resulting lack of equipment, to be used for demonstration of simple experiments, which would be both competitive in performance and cheap to produce, led to the decision to research opportunities for self-manufacturing.

关键词： Three-dimensional printing Student Research Laboratory for optical engineering optical equipment printing capabilities 3D printers Accuracy optical instruments

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Aplanatic hybrid lenses

Aplanatic hybrid lenses

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conference on current developments in lens design and optical engineering VIII

作者： Garcia-Lievanos, O. Vazquez-Montiel, S. Inst Nacl Astrofis Opt & Electr Luis Enr Erro 1 Puebla 72000 Mexico

ISBN: (纸本)9780819468154

We propose a novel method to correct the spherical and coma aberration using a hybrid element (refractive-diffractive). The refractive surface is used to correct the coma, we obtain this condition curving the second principal plane and centred it on the axial point image. The diffractive element is used to correct the spherical aberration using an exact ray trace and the diffractive coefficients as variables. The optimization routine is no required. This method can be used for any conjugates position.

关键词： Monochromatic aberrations Ray tracing lenses lens design Refractive index Spherical lenses Diffraction gratings Distance measurement optical spheres Refraction

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Tunable refraction power by mutual rotation of helical lens parts 18

Tunable refraction power by mutual rotation of helical lens ...

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conference on current developments in lens design and optical engineering XVIII

作者： Sieber, Ingo Martin, Thomas Stiller, Peter Karlsruhe Inst Technol Inst Appl Comp Sci Hermann von Helmholtz Pl 1 D-76344 Eggenstein Leopoldshafen Germany

ISBN: (纸本)9781510612082;9781510612075

This paper presents a refractive optical system consisting of two lens bodies with helical surface structures, which allows for tuning the optical refraction power by means of a mutual rotation of the lens bodies around the optical axis. Thus, the refraction power can be tuned continuously in a certain range. The helical surfaces are shaped by changing the radius of curvature as a function of to the polar angle. Combination of such two surfaces results in an optics with refraction power being tunable by a mutual rotation. This optical system is multifocal with at least two sectors with different individually tunable refraction powers. To obtain a monofocal rotation optics, obscuration of one of the lens sectors is necessary. Conventional lens systems providing tunable refraction power do so by mutual axial or lateral shift of the lenses or the lens parts. Hence, additional space for lens movement is needed in the mechanical design. Since the rotational optics allows for adjustment of the refraction power by a mutual rotation of the lens parts, no displacement of lenses is needed and a more compact design is obtained.

关键词： Freeform optics varifocal optics rotation optics

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