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optical design and tolerances of wide field imagers for astronomical survey

Optical design and tolerances of wide field imagers for astr...

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conference on current developments in lens design and optical engineering IV

作者： Thibault, S Lacoursière, J Doucet, M Wang, M Reecht, J INO St Foy PQ G1P 4S4 Canada

ISBN: (纸本)0819450464

We present three designs and tolerances of wide-field imagers (30x30 arc-minutes or larger) for astronomical surveying. Two infrared cameras (CPAPIR and PANORAMIX II) were designed for the 0.8-2.4 mum band and a third one (WIRCAM) for the visible and near-infrared band extending from 410 nm to 950 nm. The cameras are installed on the telescopes of the Canada-France-Hawaii (Hawaii, USA) and Mont Megantic Observatories (Quebec, Canada). The three cameras are compact, use only spherical refractive components and have an internal pupil accessible for insertion of filtering components. A Lyot stop must be used in the infrared camera for background rejection. For PANORAMIX II, a set of filters is used at the internal pupil. Correction of the large off-axis aberrations generated by the telescopes, wide spectral coverage, material choices, cryogenic temperature and alignment were the main design challenges. Also, tolerancing was particularly critical for the infrared cameras because they are cryogenically cooled, thus forbidding adjustment of internal components. The cameras theoretical performances are presented in terms of point-spread function, encircled energy and distortion.

关键词： optical design wide field focal reducer broadband astronomical survey catadioptric

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The high contrast performance of an optical vortex coronagraph

The high contrast performance of an optical vortex coronagra...

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conference on current developments in lens design and optical engineering VII

作者： Palacios, David M. Swartzander, G. A., Jr. CALTECH Jet Prop Lab 4800 Oak Grove Dr Pasadena CA 91109 USA Univ Arizona Sch Opt Sci Tucson AZ 85721 USA

ISBN: (纸本)0819463671

The goal of the Terrestrial Planet Finder Mission is to detect and characterize Earth-Re planets. Detection of these faint objects, which appear very close to their parent stars, requires a coronagraph capable of achieving better than 100 starlight suppression within a few Airy rings of the stellar image. The coronagraph is also required to maintain this high stellar extinction over a 100nm spectral bandwidth. To ease requirements on the telescope, a high planet light throughput and low sensitivity to wave front aberrations are also desirable features. An optical vortex coronagraph is a promising candidate architecture, which makes use of a spiral phase plate placed in an intermediate image plane to null out the stellar signal. This architecture has the advantage of high stellar extinction, high planet light throughput, and low sensitivity to wave front aberrations. Here we report the high contrast performance of an optical vortex coronagraph limited by the manufacturability of the spiral phase plate.

关键词： coronagraphs terrestrial planets optical vortices

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design of a radiance meter with predicted size of source and distance effects 17

Design of a radiance meter with predicted size of source and...

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conference on current developments in lens design and optical engineering XVII

作者： Suarez-Romero, J. G. Solorio-Leyva, J. C. Hurtado-Ramos, J. B. Tecnolo Nacl Mexico lnst Tecnolo Queretaro Tecnolo SN Esq Escobedo Queretaro 76000 Qro Mexico Tecnol Nacl Mexico Inst Tecnol Piedad Tecnol 2000 La Piedad 59370 Michoacan Mexico Inst Politecnico Nacl Centro Invest Ciencia Aplicada Tecnol Cerro Blanco 141 Queretaro 76090 Qro Mexico

ISBN: (数字)9781510602861

ISBN: (纸本)9781510602854;9781510602861

In a previous work, we described the theoretical fundamentals for the design of radiance meters. There, we observed that the length between the first and the second aperture of the instrument plays an important role in the performance of the meter. Such a length is a parameter related with the instrument response to variations of the size of the source and of the distance between the instrument and the source. Such dependences are not predicted by the theory of geometrical optics, normally used in the instrument design. Even the approximation of wave optics gives a partial understanding of the propagation of optical radiation. A more general treatment, based in the theory of partial coherence, gives a better description of the propagation.

关键词： Radiometry Radiance meter Partial Coherence Diffraction Lambertian Source Distance Effect Size of Source Effect Diffraction Corrections

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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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optical transmittance of high-efficiency cavity with photon recycling

Optical transmittance of high-efficiency cavity with photon ...

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conference on current developments in lens design and optical engineering XII/Advances in Thin Film Coatings VII

作者： Lin, Che-Chu Lee, Xuan-Hao Chien, Wei-Ting Chen, Hen-Xiang Sun, Ching-Cherng Natl Cent Univ Dept Opt & Photon Inst Lighting & Display Sci Chungli 320 Taiwan

ISBN: (纸本)9780819487384

A planar-exit lighting surface is not only used in the luminaires but also useful in the display backlights and other illumination systems. Most planar-exit lighting surfaces are made by edge-lit with line light source or 1-D LED array. If it is not edge-lit type, the light source can be two-dimensional, but a cavity is required. In this paper, a high-efficiency cavity providing extremely high energy transmittance with photon recycling is reported and demonstrated. The cavity contains a diffuser and the high reflectivity surfaces. The optical efficiency of the cavity is calculated by a formula with considering photon recycling. Furthermore, various kinds of diffusers are applied to change the optical transmittance as well as the light pattern. When the reflectivity of the inner wall of the lighting cavity is about 96 %, the optical efficiency of the cavity is higher than 90 % with several diffusers. The experimental measurement as well as the calculation is demonstrated in the paper.

关键词： Lighting cavity photon recycling optical efficiency diffuser

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Macro optical system for biological application

Macro optical system for biological application

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conference on current developments in lens design and optical Systems engineering

作者： Kawano, Y Abe, C Abe, K Hayashi, K Hatta, Y Tamura, K Olympus Amer Inc Sci Equipment Grp Melville NY 11747 USA

ISBN: (纸本)0819437387

currently, the requirement of wide field view fluorescence observation is increasing in the biological field, but the existing microscopes have difficulty in imaging lower magnification fluorescence images. It is very easy to image in higher magnification with higher resolution and brightness using existing microscopes, but it is very difficult to image in lower magnification that are also bright. We focused on two applications in which a macro lens would be useful. The first application is DNA array reading. The second application is In Vivo imaging. Both applications require wide observation areas and bright images which are needed to lower magnification and fluorescence capability. The macro lens needs to have high numerical aperture (N..) and low magnification. We also believe if the macro lens can be attached to the existing microscopes, it will be quite useful to various applications because the scientists can then observe fluorescence images from low magnification to high magnification. To fulfill these needs, we designed macro objective lenses. Listed bellows are our macro lens' unique features. 1. Specification for the macro objective lenses are 2X, N. A. 0.14 and 4X, N. A. 0.28. These N. A. is higher than the existing microscope objective lenses of equal magnifications. 2. The 4X and 2X macro lens can be attached to existing microscopes. 3. These macro lenses can be used with the video lens such as 0.5X.

关键词： macro objective lens 4X 2X fluorescence

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design of an imaging VISAR diagnostic for the national ignition facility (NIF)

Design of an imaging VISAR diagnostic for the national ignit...

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conference on current developments in lens design and optical engineering IV

作者： Malone, RM Frogget, BC Kaufman, MI Watts, PW Bell, PM Celester, JR Bechtel Nevada Los Alamos NM 87544 USA

ISBN: (纸本)0819450464

The National Ignition Facility (NIF) requested an optical diagnostic for measuring shock velocities, shock breakout times, and shock emission of objects with sizes of I to 10 mm. For the polar port of the target chamber, an 8-inch triplet lens collects light at f/3 inside a 30-foot-diameter vacuum chamber and uses an optical relay to send the image into two interferometers located at a distance of 160 feet. Light propagates through a VISAR (Velocity Interferometry System for Any Reflector) interferometer employing a Mach-Zehnder configuration. After exiting the interferometers the images are recorded, both by streak cameras and CCD gated imagers. Discrete magnification changes are accomplished by swapping out optical elements. Large dove prisms are used to rotate the image to align a selected region of the object with the slits of the streak cameras. Unique mounting structures are required to remotely control the alignment of the optical axis. Finite Element Analysis (FEA) was performed on all mounting structures. The first 8-inch triplet can be no closer than 500 mm from the target chamber center and is protected by a blast window that has to be replaced after every event. The first several lens groups have to be fused silica for radiation resistance. A frequency-doubled Nd:YAG laser, operating at 659.5 nm, is used to illuminate the moving object. The VISAR laser wavelength had to be different than the first, second, and third harmonics of the NIF drive lasers.

关键词： optical relay interferometer national ignition facility (NIF) VISAR streak camera

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Development and optical testing of the camera, hand lens, and microscope probe with scannable laser spectroscopy (CHAMP-SLS)

Development and optical testing of the camera, hand lens, an...

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conference on current developments in lens design and optical engineering IX

作者： Mungas, Greg S. Guersel, Yekta Sepulveda, Cesar A. Anderson, Mark La Baw, Clayton Johnson, Kenneth R. Deans, Matthew Beegle, Luther Boynton, John CALTECH Jet Prop Lab 4800 Oak Grove Dr Pasadena CA 91109 USA NASA Ames Res Ctr Moffett Field CA 94035 USA

ISBN: (纸本)9780819472809

Conducting high resolution field microscopy with coupled laser spectroscopy that can be used to selectively analyze the surface chemistry of individual pixels in a scene is an enabling capability for next generation robotic and manned spaceflight missions, civil, and military applications. In the laboratory, we use a range of imaging and surface preparation tools that provide us with in-focus images, context imaging for identifying features that we want to investigate at high magnification, and surface-optical coupling that allows us to apply optical spectroscopic analysis techniques for analyzing surface chemistry particularly at high magnifications. The camera, handlens, and microscope probe with scannable laser spectroscopy (CHAMP-SLS) is an imaging/spectroscopy instrument capable of imaging continuously from infinity down to high resolution microscopy (resolution of similar to 1 micron/pixel in a final camera format), the closer CHAMP-SLS is placed to a feature, the higher the resultant magnification. At hand lens to microscopic magnifications, the imaged scene can be selectively interrogated with point spectroscopic techniques such as Raman spectroscopy, microscopic Laser Induced Breakdown Spectroscopy (micro-LIBS), laser ablation mass-spectrometry, Fluorescence spectroscopy, and/or Reflectance spectroscopy. This paper summarizes the optical design, development, and testing of the CHAMP-SLS optics.

关键词： Camera hand lens microscope microscopy spectroscopy Raman micro-LIBS Fluorescence laser ablation mass-spectrometry

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Optomechanical design of a low-cost CCD-based camera

Optomechanical design of a low-cost CCD-based camera

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conference on current developments in lens design and optical Systems engineering

作者： Ahmad, A Arndt, T Bomber, R Perez, R Rodriguez, H Panasiti, M Raytheon Missile Syst Tucson AZ 85734 USA

ISBN: (纸本)0819437387

Low-cost CCD-based cameras offer several cost and performance advantages for remote sensing applications. The optomechanical design of such cameras is inherently simple because zoom, gain and yaw corrections can be performed electronically, thereby, requiring no moving parts or mechanisms. This paper presents the optomechanical design and the results of structural and thermal analyses for a low-cost camera consisting of only three major parts: lens, electronics and camera housing. This camera uses a wide field of view lens with a fast f-number to acquire high-resolution images under various day and night time illumination scenarios. Passive athermal design of the lens maintains a high value of the MTF over a temperature range of 110 degreesC. Selection of the materials and adhesives used in this camera is dictated by a lifetime requirement of over 30 years under adverse environmental conditions. Structural and thermal modeling results confirm the survivability and performance of this camera under various shock, vibration and thermal loads.

关键词： CCD's MTF refractive optical systems passive athermalization low cost modular design thermoelectric cooler telecentric lens low light level camera

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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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