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检索条件"任意字段=Conference on Current Developments in Optical Design and Optical Engineering IV"

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The orbiting carbon observatory (OCO) instrument optical design

The orbiting carbon observatory (OCO) instrument optical des...

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conference on current developments in Lens design and optical engineering V

作者： Haring, R Pollock, R Sutin, B Crisp, D Hamilton Sundstrand Pomona CA 91701 USA

ISBN: (纸本)0819454613

The Orbiting Carbon Observatory (OCO) will measure the distribution of total column carbon dioxide in the Earth's atmosphere from an Earth-orbiting satellite. Three high-resolution grating spectrometers measure two CO2 bands centered at 1.61 and 2.06 mum and the oxygen A-band centered at 0.76 mum in the near infrared region of the spectrum. This paper presents the optical design and highlights the critical optical requirements flowed down from the scientific requirements. These requirements necessitate a focal ratio of f/1.9, a spectral resolution of 20,000, and precedence-setting requirements for polarization stability and the instrument line shape function. The solution encompasses three grating spectrometers that are patterned after a simple refractive spectrometer approach consisting of an entrance slit, a two-element collimator, a planar reflection grating, and a two-element camera lens. Each spectrometer shares a common field of view through a single all-reflective telescope. The light is then re-collimated and passed through a relay system, separating the three bands before re-imaging the scene onto each of the spectrometer entrance slits using an all-reflective inverse Newtonian re-imager.

关键词： infrared spectrometer greenhouse gases carbon dioxide oxygen A-band

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Fiber-optical system for visualization of inner pipe defects by microrobot.

Fiber-optical system for visualization of inner pipe defects...

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conference on current developments in Lens design and optical engineering V

作者： Gradetsky, V Krabchuk, L Kniazkov, M Solovtsov, V Tulaikova, T Simakova, M Russian Acad Sci Inst Prob Mech Moscow 119526 Russia

ISBN: (纸本)0819454613

The control systems of the miniature robots are suggested for their motion over internal surfaces inside of the small diameter tubes. The mechanical system information-measuring sensor and control systems are considered. Three versions of the mechanical systems are suggested: electromagnetic, triad wheels and conversion of rotation motion to translation one. The electromagnetic mechanism use push pull tipe method for translation motion realization. Developed schemes in the modules design of control systems were checked experimentally on the robot's prototypes. Some results of the computer simulation illustrate the multilink robot control motion along the internal diameters of the tubes. This work was fulfilled under financial support of the Russian Found of Fundamental researches N 01-01-00913 and in frames of Federal Multi Purpose Scientific and Technical Program of Ministry of Industry, Science and Technologies: "Researches and developments on priority directions of science and technology", "Knowledgeable basic investigations" block, "Basic investigations at the field of physics sciences" part Mechanics.

关键词： minirobot in-tube motion mechanical system control algorithms on-board microprocessor control schemes

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optical PCB using waveguide-embedded backplane

Optical PCB using waveguide-embedded backplane

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conference on current developments in Lens design and optical engineering V

作者： Yoon, KY Cho, IK Ahn, SH Kim, JT Elect & Telecommun Res Inst Taejon 305350 South Korea

ISBN: (纸本)0819454613

A practical optical printed circuit board (PCB) was demonstrated, using a waveguide-embedded optical backplane and processing boards. The polymeric waveguide was produced by means of a hot embossing technique then embedded following a conventional lamination processes. The core size of waveguide was 100 x 60 mum(2) (input section), 60 X 60 mum(2) (output section), and the propagation loss of tapered polymeric waveguide was approximately 0.1 dB/cm at 850 nm. We prepared a optical backplane with polymeric waveguide by using conventional multilayer board lamination processes. The transmission power and dimension of the optical backplane was same as those of waveguide before lamination. A metal optical bench was used as a packaging die for the optical devices and the integrated circuit chips in both the transmitter and the receiver processing boards. We used a 1 x 4 850 nm VCSEL array with 2 dBm of output power for the transmitter and a PIN photodiode array for the receiver. We successfully demonstrated 8 Gb/s of data transmission between the transmitter processing board and the optical backplane board.

关键词： polymeric waveguide hot embossing technique optical backplane optical printed circuit board waveguide-embedded backplane metal optical bench multilayer board lamination board-to-board interconnection

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International innovations in optical finishing

International innovations in optical finishing

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conference on current developments in Lens design and optical engineering V

作者： Jacobs, SD Univ Rochester Ctr Opt Mfg Rochester NY 14623 USA

ISBN: (纸本)0819454613

Every few years new polishing technologies attempt to make the transition from the research laboratory into the commercial sector. Success awaits any process that is well controlled and predictable (e.g., deterministic), rapid, capable of smoothing to sub-rum rms roughness levels while removing damage from grinding, affordable, and easily implemented. Applicability to different optical materials and a variety of part sizes and shapes is extremely important, but may not be required for a new technology to succeed in a niche market. This paper reviews six innovations in polishing of precision optics: Canon's Super-Smooth Polisher (CSSP) that uses a sub-aperture pitch lap - a relatively mature but important base-line technology;Nikon/Osaka University's RF Plasma Chemical Vaporization Machining (CVM);Epion's Gas Cluster Ion Beam (GCIB) Process;the IOM University of Leipzig/NTGL Ion Beam Finishing (IBF) Technology;Zeeko's "Precessions" Process with a sub-aperture section of an inflatable pad;and QED Technology's Magnetorheological Finishing (MRF) with a magnetic fluid ribbon. The removal mechanism and some recent achievements for each process are discussed.

关键词： optical finishing pitch polishing sub-aperture lap computer numerical control ion beams magnetic fluids

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Avoiding unstable regions in the design space of EUV mirror systems comprising high-order aspheric surfaces

Avoiding unstable regions in the design space of EUV mirror ...

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conference on current developments in Lens design and optical engineering V

作者： Marinescu, O Bociort, F Braat, J Delft Univ Technol Opt Res Grp NL-2628 CJ Delft Netherlands

ISBN: (纸本)0819454613

When Extreme Ultraviolet mirror systems having several high-order aspheric surfaces are optimized, the configurations often enter into highly unstable regions of the parameter space. Small changes of system parameters lead then to large changes in ray paths, and therefore optimization algorithms crash because certain assumptions upon which they are based become invalid. We describe a technique that keeps the configuration away from the unstable regions. The central component of our technique is a finite-aberration quantity, the so-called quasi-invariant, which has been originally introduced by H. A. Buchdahl. The quasi-invariant is computed for several rays in the system, and its average change per surface is determined for all surfaces. Small values of these average changes indicate stability. The stabilization technique consists of two steps: First, we obtain a stable initial configuration for subsequent optimization by choosing the system parameters such that the quasi-invariant change per surface is minimal. Then, if the average changes per surfaces of the quasi-invariant remain small during optimization, the configuration is kept in the safe region of the parameter space. This technique is applicable for arbitrary rotationally symmetric optical systems. Examples from the design of aspheric mirror systems for EUV lithography will be given.

关键词： mirror systems aspheres EUV lithography optimization relaxation

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Improving efficiency of beam splitter for DVD pickup

Improving efficiency of beam splitter for DVD pickup

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conference on current developments in Lens design and optical engineering V

作者： Chen, WJ Chen, CH Shieh, HPD Natl Taiwan Univ Sci & Technol Dept Elect Engn Taipei 106 Taiwan

ISBN: (纸本)0819454613

The majority of the beam splitters for three beam tracking in commercial DVD pickup employ lamellar phase gratings, which already provides sufficient efficiency. However, for a pickup with all diffractive elements, the power budget becomes more critical, and a higher efficiency of the beam splitter is required. In this paper, we have investigated and will present the influence of the desired energy ratio between the zeroth order central beam to the first order side beam on the total efficiency of the beam splitter. The simulation based on scalar diffraction theory shows that the total efficiency of a lamellar phase grating will drop as the ratio decrease, which can be improved by employing a more sophisticated surface relief. The equal-side triangular profile has been investigated as a solution and the geometrical size of the profile has been optimized for several desired energy ratio. For a low cost fabrication process with photolithography, the total efficiency loss due to quantization with different quantization levels of the triangular surface relief has been estimated with scalar diffraction theory. This paper is concluded with a table of optimal phase level for a given energy ratio and desired minimum total efficiency with the consideration of fabrication cost.

关键词： DVD pickup beam splitter diffractive optical element

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The design of microscopic system using zoom structure with a fixed magnification and the independency on the variation of object distance

The design of microscopic system using zoom structure with a...

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conference on current developments in Lens design and optical engineering V

作者： Ryu, JM Jo, JH Jung, JH Chun, YS Kang, GM Hannam Univ Sch Nat Sci Taejon 306791 South Korea

ISBN: (纸本)0819454613

The multi-configurative microscopic system for inspecting the wire-bonding of reed frame is designed. Object rays is nearly collimated by a objective lens group which is a common lens group of x2 and x6 imaging lens systems and is splitted by two beam-splitters composed of a penta-prism and a refracting prism. And object rays started from the central region and the boundary region(reed frame region) on semiconductor chip(that is, the object) are imaged at the two different imaging planes by x2 and x6 imaging lens groups, respectively. The x6 imaging lens system with a constant object distance and a constant magnification is well designed by general imaging optics system design method. However, since the depth of wire structure on the reed frame has about +/-3 mm, in order to observe by a constant magnification and at a fixed imaging plane without the dependency on the variation of objective distance generated by the depth of wire structure on the reed frame, the imaging lens system is composed of two separated groups, which should be moved along nonlinear locus like mechanically compensated zoom lenses. The nonlinear equations for zoom locus are derived by using the Gaussian bracket. Refraction powers and positions of each groups are numerically determined by solving the equations, and initial design data for each groups is obtained by using Seidel third order aberration theory. The optimization technique is finally utilized to obtain this multi-configurative microscopic system.

关键词： lens design equivalent lens imaging system microscopic system multi-configurative system

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Fielding of an imaging VISAR diagnostic at the National Ignition Facility (NIF)

Fielding of an imaging VISAR diagnostic at the National Igni...

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conference on current developments in Lens design and optical engineering V

作者： Malone, RM Bower, JR Capelle, GA Celeste, JR Celliers, PM Frogget, BC Guyton, RL Kaufman, MI Lare, GA Lee, TL MacGowan, BJ Montelongo, S Ng, EW Thomas, TL Tunnell, TW Watts, PW Bechtel Nevada Los Alamos NM 87544 USA Lawrence Livermore Natl Lab Livermore CA 94551 USA

ISBN: (纸本)0819454613

The National Ignition Facility (NIF) requires diagnostics to analyze high-energy density physics experiments. As a core NIF early light diagnostic, this system measures shock velocities, shock breakout times, and shock emission of targets with sizes from I to 5 mm. A 659.5 nm VISAR probe laser illuminates the target. An 8-inch-diameter fused silica triplet lens collects light at f/3 inside the 33-foot-diameter vacuum chamber. The optical relay sends the image out an equatorial port, through a 2-inch-thick vacuum window, and into two VISAR (Velocity Interferometer System for Any Reflector) interferometers. Both streak cameras and CCD cameras record the images. Total track is 75 feet. The front end of the optical relay can be temporarily removed from the equatorial port, allowing for other experimenters to use that port. The first triplet can be no closer than 500 mm from the target chamber center and is protected from debris by a blast window that is replaced after every event. Along with special coatings on the mirrors, cutoff filters reject the NIF drive laser wavelengths and pass a band of wavelengths for VISAR, for passive shock breakout light, or for thermal imaging light (bypassing the interferometers). Finite Element Analysis was performed on all mounting structures. All optical lenses are on kinematic mounts, so that the pointing accuracy of the optical axis can be checked. A two-color laser alignment scheme is discussed.

关键词： VISAR optical relay interferometer National Ignition Facility (NIF) streak camera

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Measurement of lens focal length using multi-curvature analysis of Shack-Hartmann wavefront data

Measurement of lens focal length using multi-curvature analy...

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conference on current developments in Lens design and optical engineering V

作者： Neal, DR Copland, J Neal, DA Topa, DM Riera, P WaveFront Sci Inc Albuquerque NM 87123 USA

ISBN: (纸本)0819454613

The lens is one of the most commonly used optical elements. Yet it is sometimes difficult to make accurate effective focal length and pupil position measurements, especially for long focal length lenses. Many measurement methods rely on a mechanical measurement to determine the back focal length, or may require careful operator discrimination in determining the best focus position. Aberrations may confuse an automatic focal length measurement system. However, an accurate determination of the optical properties of a lens is often critical for building an accurate system model. We have developed a method for measurement of the focal length, pupil plane and collimation positions of positive lenses using a Shack-Hartmann wavefront sensor. The SHWFS uses a micro-optic lens array to separate the incoming wavefront into a pattern of focal spots. The position of these focal spots is related to the local wavefront slope. Wavefront reconstruction allows the complete incident wavefront to be retrieved. A Zernike decomposition reconstructor is used to separate the effects of lens focal power from other aberrations. The lens under test is illuminated by a point source on a computer-controlled stage. The transmitted wavefront was recorded by the SHWFS while the source was translated over a few mm range. By analyzing the Zernike coefficient associated with defocus, we were able to extract the focal length, pupil plane and collimation positions using a least squares fitting procedure. This procedure was tested for a variety of lenses of varying focal lengths, from 10 to 1000 mm focal length, and showed excellent repeatability and accuracy. These measurements were compared to knife-edge, manufacturer's specification, and ray-tracing analysis for verification testing.

关键词： focal length wavefront sensor Shack-Hartmann Hartmann-Shack lens testing optical testing optical metrology lens testing focal length measurement lens power vergence

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Proceedings of SPIE: current developments in Lens design and optical engineering iv

Proceedings of SPIE: Current Developments in Lens Design and...

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current developments in Lens design and optical engineering iv

The proceedings contains 15 papers from the Proceedings of SPIE: current developments in Lens design and optical engineering iv. Topics discussed include: Zernike polynomials and aberration balancing;optical design for imaging spectroscopy;integral optical system design of injection molded optics;structured design method for automotive lamp reflectors;optical systems for free-space laser communications;and current status and future direction of sensors in Earth observing satellites.

关键词： optical systems

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