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

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Laser beam filtering by refractive or diffractive microstructures

Laser beam filtering by refractive or diffractive microstruc...

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current developments in lens design and optical engineering VI

作者： Kaempfe, T. Kley, E.-B. Tuennermann, A. Friedrich-Schiller-University Jena Institute of Applied Physics Max-Wien-Platz 1 07743 Jena

Lateral intensity fluctuations of laser beams can be removed by spatial frequency filtering using a pinhole. Beams with a high divergence have a very small and narrow focus, therefore the pinhole must be both very small and thin. Conventional pinholes, based on absorption or reflection of the unwanted parts of the beam, have several limitations in this case. Their disadvantages can be overcome by a new kind of pinholes that are based on microstructures. They are characterized by a higher laser damage threshold, only limited by the bulk material, and a constant visibility of the beam, making the adjustment process of the pinhole a lot easier. The microstructures can be circular, binary gratings working mainly in a diffractive way, as we described earlier 1. This paper will summarize and update the results for this diffractive, dielectric pinholes and introduce a new idea of using cone-like structures, working mainly in a refractive way. We present the design, fabrication and characterization of pinholes, realized with both of these new concepts and we asses their performance and their limitations.

关键词： optical filters

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Advances in Lenticular lens arrays for visual display

Advances in Lenticular lens arrays for visual display

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current developments in lens design and optical engineering VI

作者： Johnson, R. Barry Jacobsen, Gary A. SPIE CyberAir Development Corporation 3077-K Leeman Ferry Rd Huntsville AL 35801 United States LentiClear Lenticular Lens Inc. 105 East Irving Park Rd Itasca IL 60143 United States

Lenticular lens arrays are widely used in the printed display industry and in specialized applications of electronic displays. In general, lenticular arrays can create from interlaced printed images such visual effects as 3-D, animation, flips, morph, zoom, or various combinations. The use of these typically cylindrical lens arrays for this purpose began in the late 1920's. The lenses comprise a front surface having a spherical cross-section and a flat rear surface upon where the material to be displayed is proximately located. The principal limitation to the resultant image quality for current technology lenticular lenses is spherical aberration. This limitation causes the lenticular lens arrays to be generally thick (0.5 mm) and not easily wrapped around such items as cans or bottles. The objectives of this research effort were to develop a realistic analytical model, to significantly improve the image quality, to develop the tooling necessary to fabricate lenticular lens array extrusion cylinders, and to develop enhanced fabrication technology for the extrusion cylinder. It was determined that the most viable cross-sectional shape for the lenticular lenses is elliptical. This shape dramatically improves the image quality. The relationship between the lens radius, conic constant, material refractive index, and thickness will be discussed. A significant challenge was to fabricate a diamond-cutting tool having the proper elliptical shape. Both true elliptical and pseudo-elliptical diamond tools were designed and fabricated. The plastic sheets extruded can be quite thin (<0.25 mm) and, consequently, can be wrapped around cans and the like. Fabrication of the lenticular engraved extrusion cylinder required remarkable development considering the large physical size and weight of the cylinder, and the tight mechanical tolerances associated with the lenticular lens molds cut into the cylinder's surface. The development of the cutting tool and the lenticular engraved extr

关键词： optical instrument lenses

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New designs of corrected Dall-Kirkham-type telescopes

New designs of corrected Dall-Kirkham-type telescopes

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current developments in lens design and optical engineering VI

作者： Beach, David Rakich, Andrew KiwiStar Optics Industrial Research Limited POB 2225 Auckland New Zealand Applied Physics Ltd. 50 Birchs Rd Prebbleton Christchurch 8153 New Zealand EOS Space Systems Pty Ltd 111 Canberra Ave Griffith 2603 Australia

Improvement in the fabrication of large solid-state focal plane array photonic sensors has emphasized the need for telescopes with flat and wide angular fields of high resolution and with large spectral passbands. To increase the angular field of Cassegrain-like telescopes, various designs of correctors have been incorporated in the optical train. This paper compares specific designs based on the Dall-Kirkham format of prolate ellipsoid primary and spherical secondary mirrors, in which excellent correction is achieved over a significant field angle. The attraction of the Dall-Kirkham format is the relative ease of fabrication to a very high accuracy by simple null tests of the concave prolate-ellipsoid primary by specific separation of light source and knife-edge, and of the convex secondary by interference-matching with a previously null-tested concave spherical master. Null tests of the more common Ritchie-Chrétien design require the additional fabrication of two "Hindle spheres" or other auxiliary optics such as holograms for testing of the hyperboloidal primary and for the hyperboloidal secondary. If the Dall-Kirkham format is modified to include variants in which the "Cassegrain" image is imperfect or even afocal, it is possible to design simple corrector relays with exceptional final imaging characteristics. Examples are presented that provide distortionless, diffraction-limited, flat-field imaging over usefully wide fields and large passbands at speeds of f/5 - f/4, and having an unusually compact layout.

关键词： optical telescopes

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Off-axis scatter measurement of the Mars Reconnaissance Orbiter (MRO) optical Navigation Camera (ONC)

Off-axis scatter measurement of the Mars Reconnaissance Orbi...

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current developments in lens design and optical engineering VI

作者： Stauder, John L. Lowman, Andrew E. Thiessen, Dave Day, Darryl Miles, D.O. Space Dynamics Laboratory Utah State University Logan UT 84321 Jet Propulsion Laboratory California Institute of Technology Pasadena CA 91109

The optical Navigation Camera (ONC) is part of NASA's Mars Reconnaissance Orbiter (MRO) scheduled for an August 2005 launch. The design is a 500 mm focal length, F/8.3 Ritchey-Chrétien with a refractive field corrector. Prior to flight, the off-axis performance of the ONC was measured at visible wavelengths in the off-axis scatter facility at the Space Dynamics Laboratory (SDL). This unique facility is designed to minimize scatter from the test setup to prevent data corruption. Testing was conducted in a clean room environment, and the results indicate that no detectable contamination of the optics occurred during testing. Measurements were taken in two time frames to correct an unanticipated stray light path, which occurred just outside of the sensor's field-of-view. The source of the offending path was identified as scatter from the edges of the field corrector lenses. Specifically, scatter from the interface between the flat ground glass and polished surfaces resulted in significant "humps" in the off-axis response centered at ± 1.5°. Retesting showed the removal of the humps, and an overall satisfactory performance of the ONC. The troubleshooting, correction, and lessons learned regarding the above stray light path was reported on in an earlier paper. This paper discusses the measurement process, results, and a comparison to a software prediction and other planetary sensors. The measurement validated the final stray light design and complemented the software analysis.

关键词： Light scattering

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Proceedings of SPIE - The International Society for optical engineering - current developments in lens design and optical engineering

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

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current developments in lens design and optical engineering V

The proceedings contain 40 papers from the Proceedings of SPIE - current developments in lens design and optical engineering V. The topics discussed include: small catadioptric microscope optics;visible-NIR imaging optics for a Fourier transform spectrometer;optical design and analysis of a polarimeter for space applications;novel faceted mirror for pushbroom IR sensor;variable-focus liquid lens for portable applications;improving efficiency of beam splitter for DVD pickup;near infrared (NIR) achromatic phase retarder;passive fiber chip coupling of polymer PLC devices using hot embossing technique;optical state estimation using wavefront data;and temporal stability and performance of MR polishing fluid.

关键词： optical design

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Variable-focus liquid lens for portable applications

Variable-focus liquid lens for portable applications

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Conference on current developments in lens design and optical engineering V

作者： Kuiper, S Hendriks, BHW Huijbregts, LJ Hirschberg, A Renders, CA van As, MAJ Philips Res Eindhoven NL-5656 AA Eindhoven Netherlands

ISBN: (纸本)0819454613

The meniscus between two immiscible liquids can be used as an optical lens. A change in curvature of this meniscus by electrowetting leads to a change in focal distance. We demonstrate that two liquids in a tube form a self-centered tunable lens of high optical quality. Several properties were studied, such as optical performance, electrical characteristics and dynamic behavior. We designed and constructed a miniature camera module based on this tunable lens and show that it is very well suited for use in portable applications.

关键词： variable lens tunable lens liquid lens electrowetting dynamics camera

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Visible-NIR imaging optics for a Fourier transform spectrometer

Visible-NIR imaging optics for a Fourier transform spectrome...

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Conference on current developments in lens design and optical engineering V

作者： Thibault, S Reecht, M Lavigne, JF Desnoyers, N INO Opt Design & Optomech Grp St Foy PQ Canada

ISBN: (纸本)0819454613

We present details of optical design, opto-mechanical design and testing of a visible-NIR imaging optical system for a Fourier transform spectrometer dedicated to astronomical application at the Mont Megantic Observatory (Observatoire du Mont Megantic, OMM, located south Quebec city, Canada). design considerations as well as testing and experimental results are presented.

关键词： astronomical instrumentation optical design opto-mechanical design imaging Fourier transform spectrometer

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design and fabrication of microlens by microfluidic deposition method

Design and fabrication of microlens by microfluidic depositi...

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Conference on current developments in lens design and optical engineering V

作者： Chen, CT Chiu, CL Horng, JB Ind Technol Res Inst Optoelect & Syst Labs Hsinchu 741 Taiwan

ISBN: (纸本)0819454613

The paper presents a new processing method for design and fabrication of microlens by microfluidic deposition, in which the lenses can be formed on the media with high precise location in the fabrication process. First we may apply physical vaporization deposition (PVD) or spin coating to fabricate a thin film;secondly, the hydrophilic pattern specified by the mask of lenses can be created by photolithography, where the special lens media is made herein. Finally, the liquid solution of lens material is deposited onto the predetermined location of the lens media by the drop-on-demand fluidic actuator;thus, the microlenses are consequently formed after the complete evaporation of solvent in the solution.

关键词： microlens fabrication microfluidic deposition ink-jet

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Small catadioptric microscope optics

Small catadioptric microscope optics

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Conference on current developments in lens design and optical engineering V

作者： Shafer, DR Chuang, YH Armstrong, JJ David Shafer Opt Design Fairfield CT 06430 USA

ISBN: (纸本)0819454613

New catadioptric objectives have been developed with large bandwidths in the DUV, high numerical apertures (NAs), and small size. This can be achieved using a single glass material. designs are specifically optimized for loose alignment tolerances and ease of manufacturability. Applications include broad band DUV imaging and high resolution immersion imaging for industrial microscopy and life sciences.

关键词： catadioptric DUV broadband microscope objective

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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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