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

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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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Wide field-of-view imaging system using a liquid crystal spatial light modulator

Wide field-of-view imaging system using a liquid crystal spa...

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current developments in lens design and optical engineering vI

作者： Curatu, George Wick, David v. Payne, Don M. Martinez, Ty Harriman, Jamie Harvey, James E. University of Central Florida 4000 Central Florida Blvd Orlando FL 32816 Sandia National Laboratories MS 1188 PO Box 5800 Albuquerque NM 87185 Narrascape 3101 Hyder Ave. SE Albuquerque NM 87106 Naval Research Laboratory c/o AFRL/DEBI 3550 Aberdeen Ave. SE Kirtland AFB NM 87117 Boulder Nonlinear Systems 450 Courtney Way Lafayette CO 80026 LightPath Technologies 2603 Challenger Tech Court Orlando FL 32826

This paper presents the optical design and experimental demonstration of a compact, foveated, wide field-of-view (FOv) imaging system using two lenses and a liquid crystal spatial light modulator (SLM). The FOv of this simple doublet system is dramatically improved by the SLM, which can be programmed to correct all the geometrical aberrations at any particular field angle. The SLM creates a variation in the image quality across the entire FOv, with a diffraction-limited performance at the field angle of interest (similar to the foveated human vision). The region of interest can be changed dynamically, such that any area within the FOv of the system can be highly resolved within milliseconds. The wide FOv, compactness, and absence of moving parts make this system a good candidate for tracking and surveillance applications. We designed an f/7.7 system, with a 60° full FOv, and a 27 mm effective focal length. Only two lenses and a beam splitter cube were used along with a reflective SLM. The theoretical wavefront aberration coefficients were used to program the SLM, which was placed in the pupil plane of the system. A prototype was built and the system was experimentally demonstrated using monochromatic light and a CCD camera.

关键词： Imaging systems

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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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Microstructured fibres for sensing applications

Microstructured fibres for sensing applications

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Photonic Crystals and Photonic Crystal Fibers for Sensing Applications

作者： Petrovich, M.N. van Brakef, A. Poletti, F. Mukasa, K. Austin, E. Finazzi, v. Petropoulos, P. O'Driscoll, E. Watson, M. DelMonte, T. Monro, T.M. Dakin, J.P. Richardson, D.J. University of Southampton Southampton United Kingdom School of Chemistry and Physics University of Adelaide Adelaide SA Australia Furukawa Electric Co. Ltd. Fitel-Photonics Laboratory Ichihara Chiba Japan BAE SYSTEMS Advanced Technology Centre Sowerby Building Bristol United Kingdom

Microstructured fibres (MOFs) are among the most innovative developments in optical fibre technology in recent years. These fibres contain arrays of tiny air holes that run along their length and define the waveguiding properties. optical confinement and guidance in MOFs can be obtained either through modified total internal reflection, or photonic bandgap effects;correspondingly, they are classified into index-guiding Holey Fibres (HFs) and Photonic Bandgap Fibres (PBGFs). MOFs offer great flexibility in terms of fibre design and, by virtue of the large refractive index contrast between glass/air and the possibility to make wavelength-scale features, offer a range of unique properties. In this paper we review the current status of air/silica MOF design and fabrication and discuss the attractions of this technology within the field of sensors, including prospects for further development. We focus on two primary areas, which we believe to be of particular significance. Firstly, we discuss the use of fibres offering large evanescent fields, or, alternatively, guidance in an air core, to provide long interaction lengths for detection of trace chemicals in gas or liquid samples;an improved fibre design is presented and prospects for practical implementation in sensor systems are also analysed. Secondly, we discuss the application of photonic bandgap fibre technology for obtaining fibres operating beyond silica's transparency window, and in particular in the 3μ,m wavelength region, j.

关键词： optical fibers

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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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