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conference on current developments in lens design and optical engineering VII

作者： Malone, Robert M. Becker, Steven A. Dolan, Daniel H. Hacking, Richard G. Hickman, Randy J. Kaufman, Morris I. Stevens, Gerald D. Turley, William D. NSTec Los Alamos Operat 182 East Gate Dr Los Alamos NM 87544 USA NSTec North Las Vegas Operat Las Vegas NV 89193 USA Sandia Natl Labs Albuquerque NM 87185 USA NSTec Special Technol Lab Santa Barbara CA 93111 USA

ISBN: (纸本)0819463671

Thermal imaging is an important, though challenging, diagnostic for shockwave experiments. Shock-compressed materials undergo transient temperature changes that cannot be recorded with standard (greater than ins response time) infrared detectors. A farther complication arises when optical elements near the experiment are destroyed. We have designed a thermal-imaging system for studying shock temperatures produced inside a gas gun at Sandia National Laboratories. Inexpensive, diamond-turned, parabolic mirrors relay an image of the shocked target to the exterior of the gas gun chamber through a sapphire vacuum port. The 3000-5000-nm portion of this image is directed to an infrared camera which acquires a snapshot of the target with a minimum exposure time of 150 us. A special mask is inserted at the last intermediate image plane, to provide dynamic thermal background recording during the event. Other wavelength bands of this image are split into high-speed detectors operating at 900-1700 nm and at 1700-3000 nm, for time-resolved pyrometry measurements. This system incorporates 90-degree, off-axis parabolic mirrors, which can collect low f/# light over a broad spectral range, for high-speed imaging. Matched mirror pairs must be used so that aberrations cancel. To eliminate image plane tilt, proper tip-to-tip orientation of the parabolic mirrors is required. If one parabolic mirror is rotated 180 degrees about the optical axis connecting the pair of parabolic mirrors, the resulting image is tilted by 60 degrees. Different focal-length mirrors cannot be used to magnify the image without substantially sacrificing image quality. This paper analyzes performance and aberrations of this imaging diagnostic.

关键词： mid-IR imaging off-axis parabolic mirrors gas gun imaging IR camera pyrometry

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Mechanical fabrication of precision microlenses on optical fiber endfaces

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optical engineering 2005年第12期44卷 123402-1-123402页

作者： Milton, G Gharbia, Y Katupitiya, J Univ New S Wales Sch Mech & Mfg Engn Sydney NSW 2052 Australia

We present a purely mechanical means of producing highly concentric spherical lenses at the endfaces of optical fibers. The production process has two stages. First, conical lenses are produced in a grinding process that ensures excellent concentricity. Then, the conical lenses are transformed to spherical lenses using a novel process called loose abrasive blasting. The cone grinding is carried out on a microgrinding machine, which has a sophisticated control system that enables the production of precision conical lenses. The blasting is carried out on a diamond blasting machine. Plots showing automatic centering performance of the microgrinding machine and scanning electron microscopy images of the conical and spherical lenses are presented. (c) 2005 Society of Photo-optical Instrumentation Engineers.

关键词： microlens optical fiber endface cone grinding

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Mechanical fabrication of precision microlenses on optical fiber endfaces

Mechanical fabrication of precision microlenses on optical f...

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conference on current developments in lens design and optical engineering V

作者： Milton, G Gharbia, Y Katupitiya, J Univ New S Wales Sch Mech & Mfg Engn Sydney NSW 2052 Australia

ISBN: (纸本)0819454613

关键词： microlens optical fiber endface cone grinding

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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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optical state estimation using wavefront data

Optical state estimation using wavefront data

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conference on current developments in lens design and optical engineering V

作者： Redding, D Sigrist, N Lou, JZ Zhang, Y Atcheson, P Acton, S Hayden, W CALTECH Jet Prop Lab Pasadena CA 91109 USA

ISBN: (纸本)0819454613

The use of wavefront measurements to deduce the state of multiple optics in a telescope beam train - their misalignments and figure errors - can be confused by the fact that there are multiple potential sources for the same measured error. This talk applies Kalman filtering techniques as a tool for separating true telescope errors from artifactual testing errors in the alignment and testing of NASA's James Webb Space Telescope, a large segmented-aperture cryogenic telescope to be launched after 2010.

关键词： optical testing segmented mirror space telescope. wavefront control wavefront sensing state estimation

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Ultra-fast focal reducer design for ∼2m-class telescopes

Ultra-fast focal reducer design for ∼2m-class telescopes

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conference on current developments in lens design and optical engineering V

作者： Beach, D Appl Phys Ltd Christchurch 8153 New Zealand

ISBN: (纸本)0819454613

An ultra-fast focal reducer design originally intended for use with spherical primary mirrors (published in optical engineering, February, 2003), has been adapted for use as a retro-fit for existing telescopes of similar to2m pupil diameter that have aspheric mirrors. The focal reducer has only one aspheric surface, located at the aperture stop, and can provide speeds up to f/0.75 while maintaining a wide field with pixel-limited resolution and a broad spectral passband. Examples have been computed for Ritchie-Chretien, Dall-Kirkham and Cassegrain systems, and for use at the prime focus of mirrors with non-zero conic constants.

关键词： focal reducer high speed high resolution wide angle broad spectral passband retrofit telescopes

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