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Diffractive optical element for an electrooptical interface based on Photonic Mixer Device (PMD)

Diffractive optical element for an electrooptical interface ...

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conference on current developments in lens design and optical Systems engineering

作者： Tai, W Schwarte, R Buxbaum, B Univ Siegen Inst Nachrichtenverarbeitung D-5900 Siegen Germany

ISBN: (纸本)0819437387

With the development of free space interconnection and optical computing different optics for these approaches have been designed, which are usually difficult to realize with conventional optical systems. The concept of an electrooptical interface based on the Photonic Mixer Device (PMD), which detects and mixes an optical signal simultaneously, has been proposed in previous publications. An array of vertical cavity surface-emitting lasers (VCSELs) is driven by input signals from different channels. The optical signals are then transformed by a lens system and a diffractive optical element (DOE) to a PMD array for processing and multiplexing. In this paper the DOE to realize the optical transformation in the electrooptical interface is presented. The DOE is composed an array of small segments, which correspond to the VCSELs with a pitch of about 250 mum. The phase functions of the DOE are designed separately for each VCSEL to generate a shifted uniform distribution on the PMD-array. For compactness the segments on the edge work at a large diffraction angle, which leads to an equivalent quasiconstant phase gradient added to them and results in high frequency structure. Therefore, for simplification of the production of the DOE, a prism is combined with the DOE to generate the desired optical transformation. The optical transformation is investigated with the simulation tool ZEMAX. The simulation results show that the DOE with the designed phase function works well for the PMD based optical interface, and it is possible to realize a parallel multi-channel electrooptical interface for code division multiplex access (CDMA) communications.

关键词： diffractive optical element interconnection Photonic Mixer Device (PMD)

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Vision multiplexing: an optical engineering concept for low-vision aids

Vision multiplexing: an optical engineering concept for low-...

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conference on current developments in lens design and optical engineering Viii

作者： Peli, Eli Harvard Univ Sch Med Dept Ophthalmol Schepens Eye Res Inst Boston MA 02115 USA

ISBN: (纸本)9780819468154

The normal visual system provides a wide field of view apparently at high resolution. The wide field is continuously monitored at low resolution for navigation and detection of objects of interest. These objects are sampled using the high-resolution fovea, applying a temporal multiplexing scheme. Most vision impairments that cause low vision impact upon only one of the components;the peripheral low-resolution wide field or the central high-resolution fovea. The loss of one of these components prevents the interplay of central and peripheral vision needed for normal function and causes disability. Traditional low-vision aids improve the impacted component, but usually at a cost of a significant loss in the surviving component. For example, magnifying devices increase resolution but reduce the field of view, while minifying devices increase the field of view but reduce resolution. A general optical engineering approach - vision multiplexing - is presented. Vision multiplexing seeks to provide both the wide field of view and the high-resolution information in ways that could be accessed and interpreted by the visual system. The use of various optical and electro-optical methods in the development of a number of new visual aids, all of which apply vision multiplexing to restore the interplay of high-resolution and wide-angle vision using eye movements in a natural way, will be described. Vision-multiplexing devices at various stages of development and testing illustrate the successes and difficulties in applying this approach for patients with tunnel vision, hemianopia (half blindness), and visual acuity loss (usually due to central retinal disease).

关键词： bioptic telescope in-the-lens telescope IOL macular degeneration peripheral prisms retinitis pigmentosa

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Smart lighting using a liquid crystal modulator 18

Smart lighting using a liquid crystal modulator

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conference on current developments in lens design and optical engineering XViii

作者： Baril, Alexandre Thibault, Simon Galstian, Tigran Univ Laval Dept Phys Genie Phys & Opt Ctr Opt Photon & Laser 2375 Rue Terrasse Quebec City PQ G1V 0A6 Canada

ISBN: (纸本)9781510612082;9781510612075

Now that LEDs have massively invaded the illumination market, a clear trend has emerged for more efficient and targeted lighting. The project described here is at the leading edge of the trend and aims at developing an evaluation board to test smart lighting applications. This is made possible thanks to a new liquid crystal light modulator recently developed for broadening LED light beams. The modulator is controlled by electrical signals and is characterized by a linear working zone. This feature allows the implementation of a closed loop control with a sensor feedback. This project shows that the use of computer vision is a promising opportunity for cheap closed loop control. The developed evaluation board integrates the liquid crystal modulator, a webcam, a LED light source and all the required electronics to implement a closed loop control with a computer vision algorithm.

关键词： optical systems Illumination closed loop vision system spatial light modulator

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The design of the Prism Film on the optical Concentrator for Photovoltaic Applications 19

The Design of the Prism Film on the Optical Concentrator for...

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

作者： Ying, Shang-Ping Chen, Bing-Mau Yang, Pao-Keng Jaing, Cheng-Chung Minghsin Univ Sci & Technol Dept Optoelect Syst Engn 1 Xinxing Rd Hsinchu 30401 Taiwan

ISBN: (数字)9781510620629

ISBN: (纸本)9781510620629

As an application of the PV technology, building integrated photovoltaic (BIPV) technologies have attracted an increasing interest in the past decade. One of these BIPV elements is the luminescent solar concentrators (LSCs). The LSC consists of a transparent plate embedded with luminescent dyes or inorganic particles, and the solar cells are attached on one or more sides. The incoming sunlight absorbed by the luminescent dyes or inorganic particles re-emits at a longer wavelength, and part of the re-emitting light trapped in the transparent plate reaches the PV cell attached on the LSC and convert it to electricity. However, the efficiency of the LSCs is still low at this stage. The surface loss on the top surface of the transparent plate is one of the main losses in LSCs. The prism film in liquid-crystal display (LCD) module is used to collimate the light in the module and enhance the overall brightness, and would be used in the LSCs to enhance the incoming sunlight to the solar cells attached on the end of the transparent plate. Then the design of the prism film is important. In this study, the ray-tracing simulation is used to investigate the optical characteristics of the LSC with the prism film covered on the top surface of the transparent plate. Different structure of the prism film will be considered to enhance the light reaches the PV cell attached on the LSC.

关键词： Prism film optical design optical Concentrator

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Method to determine refractive index by measurement of flat plates 20

Method to determine refractive index by measurement of flat ...

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conference on current developments in lens design and optical engineering XX

作者： Johnson, R. Barry Curley, Michael J. Alabama A&M Univ Dept Phys Chem & Math Coll Engn Technol & Phys Sci Huntsville AL 35811 USA Alabama A&M Univ Dept Elect Engn & Comp Sci Coll Engn Technol & Phys Sci Huntsville AL 35811 USA

ISBN: (数字)9781510629028

ISBN: (纸本)9781510629028

Minimal refractive index data in the near-infrared spectrum are available for optical plastics. Typically, refractive index measurements are made by fabricating a prism of candidate optical material and using appropriate metrology equipment. Few plastics are available in thicknesses adequate to fabricate appropriate size prisms;however, almost all optical plastics can be acquired in a flat plate form. The investigation considered two fundamental approaches to measure the refractive index by (i) rotating a flat plate and measure the beam displacement and ( ii) measuring the optical focal shift. The rotation method was determined not accurate enough. An optical focal shift method optical(n = t(optical)/t(mechanical)) was developed that utilized existing laboratory equipment. The shift of focus when the plastic plate sample was inserted was located by determining the position of maximum contrast of the projection of a Ronchi ruling target when illuminated by flux from a Cary Eclipse covering the spectral range of 550-975 nm. The instrumentation, data processing, and measurement performance are presented.

关键词： refractive index measurement metrology optical materials

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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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Two-axis, optical adjustment flexure mechanism

Two-axis, optical adjustment flexure mechanism

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conference on current developments in lens design and optical Systems engineering

作者： Bell, AD Cronin, SR ITT Ind Aerosp Commun Div Ft Wayne IN 46801 USA

ISBN: (纸本)0819437387

This technical paper describes an adjustment mechanism capable of producing microradian resolution rotational motion of an optical element. The mechanism rotates an optical element about two orthogonal axes utilizing flexure beam elements. The flexures facilitate frictionless rotation about the center of the optical element, in roll and tilt over a 1.5 degree range. The optical element is retained in an athermal mount to minimize distortion. The mechanism is constructed entirely of titanium. Integral to the mechanism is adjustment actuators to provide position adjustment of the optical element. Locking actuators retain the mechanism's final adjusted positions when exposed to severe vibration and thermal environments. The mechanism configuration may be scaled in size appropriate to the optical component requiring mounting. Although the flexure mechanism is patent pending(1), this paper presents an overview of the engineering principles utilized in precision mechanisms that the reader may be able to utilize in his or her design project.

关键词： opto-mechanical mechanism flexure roll and tilt adjustment optical component vibration stability

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Overview of Diffraction Gratings Technologies for Space-flight Satellites and Astronomy 15

Overview of Diffraction Gratings Technologies for Space-flig...

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conference on current developments in lens design and optical engineering XV

作者： Cotel, Arnaud Liard, Audrey Desserouer, Frederic Bonnemason, Francis Pichon, Pierre HORIBA Jobin Yvon SAS F-91165 Longjumeau France

ISBN: (纸本)9781628412192

The diffraction gratings are widely used in Space-flight satellites for spectrograph instruments or in ground-based telescopes in astronomy. The diffraction gratings are one of the key optical components of such systems and have to exhibit very high optical performances. HORIBA Jobin Yvon S.A.S. (part of HORIBA Group) is in the forefront of such gratings development for more than 40 years. During the past decades, HORIBA Jobin Yvon (HJY) has developed a unique expertise in diffraction grating design and manufacturing processes for holographic, ruled or etched gratings. We will present in this paper an overview of diffraction grating technologies especially designed for space and astronomy applications. We will firstly review the heritage of the company in this field with the space qualification of different grating types. Then, we will describe several key grating technologies developed for specific space or astronomy projects: ruled blazed low groove density plane reflection grating, holographic blazed replica plane grating, high-groove density holographic toroidal and spherical grating and transmission Fused Silica Etched (FSE) grism-assembled grating.

关键词： Holographic Ruled Blazed Diffraction Gratings optical Components Low stray light Diffraction Efficiency Reflection Grating

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Athermalizing Mounted Doublets With ALLVAR Alloys 25

Athermalizing Mounted Doublets With ALLVAR Alloys

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conference on current developments in lens design and optical engineering XXV

作者： Monroe, James A. Fehlberg, Olivia Zavislan, James M. ALLVAR 1201 East Fayette St Syracuse NY 13210 USA Tucson Adv Design & Assembly Ctr Edmund Opt 2650 E Elvira RdSte 102 Tucson AZ 85756 USA Univ Rochester Inst Opt 480 Intercampus Dr Rochester NY 14627 USA

ISBN: (纸本)9781510679221;9781510679238

Thermal requirements often constrain optical designs resulting in cost or performance compromises. Unless an optical system is designed from the start considering thermal requirements, effects including thermal defocus can become detrimental to the system's real-world performance. Novel negative thermal expansion ALLVAR Alloys enable a new degree of freedom during initial system design or can be used to passively athermalize an existing optical system without having to re-design. This work discusses the analysis and integration of ALLVAR Alloy 30 into an optomechanical housing to athermalize mounted commercial off-the-shelf (COTS) doublets. Calculations for the thermal defocus of the doublets and the requisite opto-mechanics to athermalize each system are first presented. The target athermalization of the doublets is also discussed. The ALLVAR Alloy 30 athermalized doublet assemblies are then manufactured, built, and tested. The results of the as-built data and testing are presented as compared to the thermal defocus analysis. This work demonstrates that an existing optical system design can be athermalized by utilizing an ALLVAR Alloy material in the optomechanical design.

关键词： Athermalization thermal Negative Thermal Expansion ALLVAR Alloy Doublet Optomechanics optomechanical design

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STABILITY OF THE optical-PROPERTIES OF ABNORMALLY DISPERSIVE LIQUIDS 4

STABILITY OF THE OPTICAL-PROPERTIES OF ABNORMALLY DISPERSIVE...

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conference on current developments in optical design and optical engineering IV

作者： PETROVA, MV PLYUKHIN, AG TOLSTOY, MN ROBB, P SIGLER, RD LEARY, DF VAVILOV STATE OPT INST ST PETERSBURGRUSSIA

ISBN: (纸本)0819415871

Abnormal dispersion is found in a large number of optical liquids. These liquids are quite useful in the design of apochromatic lens systems because they are inexpensive and are readily available compared to the expensive abnormal dispersion glasses and crystals more commonly used. Further, there is no practical upper limit on the size of a liquid optical element. However, because the use of these materials as optical elements is quite new, the long term stability of their optical properties after exposure to various environmental conditions must be determined. In this paper, we report on a series of tests performed to determine the optical stability of several abnormal dispersion liquids. The liquids were subjected to: (1) high intensity ultraviolet radiation, (2) high temperatures, and (3) long term exposure to air. Measurements of both optical transmission and refractive index were performed before and after each exposure. The tests were performed on four abnormal dispersion liquids that have been found to be quite useful in the design of apochromatic lenses. The results indicate that long term exposure to either intense ultraviolet radiation or air, produced only negligible changes in the index of refraction. Changes in optical transmission were observed, but they were largely confined to the ultraviolet spectral region. Prolonged exposure to temperatures of 60 degree(s)C did not produce any measurable change in the optical properties. The measurements were performed at the Vavilov State optical Institute, St. Petersburg, Russia, in collaboration with Lockheed Palo Alto Research Laboratory, Palo Alto, California.

关键词： Liquids Ultraviolet radiation Absorption Glasses lens design optical properties Refractive index Visible radiation Lamps optical components

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