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design of miniaturized optoelectronic systems using resonant micro scanning mirrors for projection of full-color images

Design of miniaturized optoelectronic systems using resonant...

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conference on current developments in lens design and optical engineering VII

作者： Scholles, M. Braeuer, A. Frommhagen, K. Gerwig, Ch. Hoefer, B. Lakner, H. Schenk, H. Schwarzenberg, M. Fraunhofer Inst Photon Microsyst Maria Reiche Str 2 D-01109 Dresden Germany Fraunhofer Inst Appl Opt & Precis Engn D-07745 Jena Germany

ISBN: (纸本)0819463671

Projection systems comprising micromechanical. scanning mirrors are a promising approach for information display of any kind. If combined with advanced laser diodes as light sources, ultra-compact projection heads can be realized, as it will be shown in this contribution. Besides the laser, key component of the system is a special MEMS device, a two-dimensional resonant micro scanning mirror. The laser beam formed by collimator optics is directed onto the micro scanning mirror. Then, the reflected beam describes a highly complicated Lissajous figure on the projection screen with flare angles of up to 20 degrees. By driving the mirror and electrically modulating the intensity of the laser beam in a synchronous manner, projection of images can be achieved. Advanced techniques that guarantee improved image quality and allow compensation of artifacts because of relative movement between projection head, screen, and human observer will be described. Based on these principles, several optoelectronic systems have been designed. A monochrome projection head that incorporates the laser diode, optics and the micro mirror could be reduced to a volume of 15mm x 7 mm x 5mm. A slightly larger head is attached to a laser unit with red, green, and blue lasers via glass optical fiber for projection of full color images and video streams. All systems have VGA (640 x 480 pixels) resolution. They operate with 8 bit color depth per pixel and 50 frames per second. These key features in combination with the miniaturized size allow their use for a broad range of applications.

关键词： image projection scanning mirror MEMS resonant scanning micro optics

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Comparison between the Arclight Ophthalmoscope and a Standard handheld Direct Ophthalmoscope: a Clinical study 19

Comparison between the Arclight Ophthalmoscope and a Standar...

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19th conference on current developments in lens design and optical engineering

作者： Parthasarathy, Mohana Kuppuswamy Faruq, Ibrahim Arthurs, Eugene Lakshminarayanan, Vasudevan Univ Waterloo Sch Optometry & Vis Sci Waterloo ON Canada Costco Opt Waterloo ON Canada SPIE Bellingham WA USA Univ Waterloo Dept Phys Waterloo ON Canada Univ Waterloo Dept ECE Waterloo ON Canada Univ Waterloo Dept Syst Design Engn Waterloo ON Canada

ISBN: (数字)9781510620629

ISBN: (纸本)9781510620629

The direct ophthalmoscope, a handheld device gives a highly magnified image of the retina. However, the sustainability of power source and cost are a limitation considering the usage demand. We compared a low-cost solar-powered Arclight ophthalmoscope with a standard ophthalmoscope Heine K180 in terms of ease of examination, usage, field of view, color rendition and patient comfort. Two clinically trained optometrists examined 28 patients and graded the ease of retinal examination, ease of use and assessed cup-disc ratio, which is an important diagnostic parameter for glaucoma, patient comfort and length of examination (scale 1-4). The examiners had good agreement for all assessments. Of a total of 78 examinations, only 8(10.3%) did not result in cup-disc ratio measurement in the undilated pupil condition using both devices. Ease of use was scored higher for Arclight than Heine but this was not statistically significant. In conditions like large discs, the Arclight resulted in easier examinations due to its larger field of view. Color rendition was better with the Heine device. In undilated pupils, the patients often reported that there was significant glare with Heine, however, post-dilation, they reported more glare with Arclight compared to Heine (73% versus 55%). The performance of Arclight was comparable to that of Heine and can be considered a low-cost alternative to the standard direct ophthalmoscope especially in large-scale patient examinations in developing countries where cost might be a factor.

关键词： Direct Ophthalmoscope Retina ophthalmology cup to disc ratio Arclight ophthalmoscope Heine ophthalmoscope solar powered ophthalmoscope

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Proceedings of SPIE - The International Society for optical engineering

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

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19th conference on current developments in lens design and optical engineering 2018

ISBN: (纸本)9781510620612

The proceedings contain 33 papers. The topics discussed include: correction of wavefront aberrations in focal and afocal TMAs;a thermal glass for infrared optics;caustic surfaces produced by a plane wavefront refracted through cemented doublet lenses;holographic progressive lenses;using effective medium theories to design tailored nanocomposite materials for optical systems;toward semantic loop closure in simultaneous localization and mapping systems;optic design and manufacturing issues of a high numerical broad band IR solid immersion microscope objective;optical design and predicted performance of the WFIRST phase-B imaging optics assembly and wide field instrument;and novel designs for minimizing diffraction effects of large segmented mirror telescopes.

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optical microscope for nuclear emulsion readout -: system design and results in application

Optical microscope for nuclear emulsion readout -: system de...

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8th conference on current developments in optical design and optical engineering

作者： Winkler, K Körner, L Gussek, P Balogh, I Breitfelder, S Schlichting, J Dupraz, JP Fabre, JP Panman, J Papadopoulos, IM Zucchelli, P Van de Vyver, B Syst GmbH Opt JENOPTIK Laser Jena Germany

ISBN: (纸本)0819432652

Experiments such as CHORUS at CERN require the inspection of a large amount of nuclear emulsion plates exposed to particle beams. Rare events need to be found, measured and analysed. Their features are stored as grains in microscopic dimensions in a three-dimensional stack of plates. A new, fully automatic immersion microscope system was developed for this purpose. It features high resolution, small depth of focus, large working distance, large field of view and synchronization of illumination and detector. An additional requirement is given by variations in the refraction index and in the relative thickness of immersion oil and emulsion. The approach used here is an imaging system based on a vario objective lens (variable oil immersion) with extreme numerical aperture, large working distance and wide field, combined with a matched high-aperture Koehler illuminator. The light source is a mercury are lamp, combined with a filter package for the g-line. It includes liquid crystal elements for synchronized shuttering and variable attenuation. The theoretical resolution is less than 1 micron in x, y, z within a volume of 0.5mm diameter (x, y) times 1 mm scanning depth (z) in all situations within a predefined index range (1.49 to 1.54). Three identical pieces of the system have been built. The experimentally measured resolution confirms the expectations and is better than 1 micron in all three dimensions. This is the result of a complex process of system design and manufacturing, unifying optical, opto-mechanical and optoelectronical contributions. This process spans from the early stages of feasibility and manufacturing up to the test and adjustment procedures. The three prototypes are operational since the fall of 1998 in the frame of the CHORUS project. Practical experience and application results are presented.

关键词： optical microscopy oil immersion nuclear emulsion readout variable immersion systems design

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Proceedings of SPIE - The International Society for optical engineering

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

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conference on current developments in lens design and optical engineering XVI

ISBN: (纸本)9781628417449

The proceedings contain 24 papers. The topics discussed include: integration design of endoscope with different viewing angles;ultra-compact hourglass lens for integrated cameras;testing and alignment of freeform based multi-mirror telescopes;tolerancing an optical freeform surface: an optical fabricator's perspective;manufacture and analysis of a refractive surface with variable asphericity to model the human cornea;modeling and design of a multichannel chromatic aberration compensated imaging system;temperature-dependent refractive index measurements of L-BBH2 glass for the Subaru CHARIS integral field spectrograph;cryogenic refractive indices of S-LAH55, S-LAH55V, S-LAH59, S-LAM3, S-NBM51, S-NPH2, S-PHM52, and S-TIH14 glasses;temperature-dependent refractive index measurements of CaF2, Suprasil 3001, and S-FTM16 for the Euclid near-infrared spectrometer and photometer;design considerations for an unconventional infrared prism with a 90 degree ray deviation;and high-performance LED luminaire for sports hall.

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Comparison of the Efficacy of Three Direct Ophthalmoscopes: A Clinical Study 20

Comparison of the Efficacy of Three Direct Ophthalmoscopes: ...

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conference on current developments in lens design and optical engineering XX

作者： Parthasarathy, Mohana Kuppuswamy Faruq, Ibrahim Arthurs, Eugene Lakshminarayanan, Vasudevan Univ Waterloo Sch Optometry & Vis Sci Theoret & Expt Epistemol Lab Waterloo ON Canada Costco Opt Waterloo ON Canada SPIE Bellingham WA USA Univ Waterloo Dept Phys Waterloo ON Canada Univ Waterloo Dept ECE Waterloo ON Canada Univ Waterloo Dept Syst Design Engn Waterloo ON Canada

ISBN: (数字)9781510629028

ISBN: (纸本)9781510629028

Retinal examination using direct ophthalmoscope is preferred over other techniques for screening purposes because of its portability and high magnification, despite its power sustainability and cost issues. With increasing number of low-cost sustainable devices available in the market, it is important to assess the efficacy of the devices. We compared three devices - Arclight ophthalmoscope, a D-Eye attached to iPhone 6, and conventional ophthalmoscope Heine K180 - in terms of ease of examination, usage, field of view, color rendition, patient comfort, length of examination, and closeness to the eye. Two trained optometrists examined 26 undilated eyes and graded the ease of retinal examination, ease of use and assessed vertical cup:disc ratio (VCDR). Patients reported their comfort level in terms of glare produced by the light source, length of examination and closeness to the eye. The examiners had a good agreement for all assessments. Of 26 eyes, VCDR assessment was not possible in 10/ 26 (38.4%) of the examinations, in (3/26, 11.5%) examinations with Arclight, in 0/26 examinations with D-Eye. Ease of use score was higher for Arclight and D-Eye than Heine. D-Eye had a relatively larger field of view than other 2 devices. Heine ranked first in color rendition. The luminance level of the high-beam setting of Arclight was more than twice that of Heine and D-Eye. Despite that, the patients reported experiencing uncomfortable glare in Heine (14/26, 53.8%), significant glare with Arclight (16/26, 61.5%) and some/no glare with D-Eye. The examination time was shorter when using D-Eye. Overall, D-Eye scored better in most of the evaluation items followed by Arclight.

关键词： Direct Ophthalmoscope Retina cup to disc ratio D-Eye smartphone ophthalmoscope Arclight ophthalmoscope Heine ophthalmoscope solar powered ophthalmoscope

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Reduced risk of catastrophic optical mirror damage in high power tapered lasers using intra-cavity diverging lens

Reduced risk of catastrophic optical mirror damage in high p...

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conference on Semiconductor Lasers and Laser Dynamics II

作者： Tee, Chyng Wen Lau, Fat Kit Zhao, Xin Penty, Richard White, Ian Calligaro, Michel Lecomte, Michel Parillaud, Olivier Michel, Nicolas Krakowski, Michel Univ Cambridge Dept Engn Trumpington St Cambridge CB2 1PZ England Alcatel Thales III V Lab F-91404 Orsay France

ISBN: (纸本)0819462403

This paper approaches the problem of catastrophic optical mirror damage from a geometrical waveguide point of view. Instead of engineering the characteristics of the semiconductor material at the facet of the laser using quantum-well intermixing or other sophisticated wafer growth technique, a simple intra-cavity diverging lens concept is proposed and demonstrated to be capable of effectively expanding the lateral optical mode in order to counter the effect of SHB and thermal lensing effect, thereby reducing the risk of COMD. The Gaussian output beam profile is maintained throughout the whole of the current range tested, showing that expanding the nearfield at facet using integrated lens does not compromise the brightness of the laser. A key finding in this work is that the diverging effect on an optical mode is a thoroughly scalable effect that can be engineered by varying the etch-depth of the integrated lens. Fabrication of the lens is compatible with existing laser manufacturing process flow in that it can be easily implemented either by post-processing technology or by an additional lithographical step. This opens up new possibility in device design, with the beam width along the lateral direction being a parameter that can be optimized in isolation.

关键词： high power laser high brightness laser tapered laser intra-cavity lens catastrophic optical mirror damage diffraction beam quality post-processing technology

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ADVANCED TECHNOLOGY optical TELESCOPES iii.

ADVANCED TECHNOLOGY OPTICAL TELESCOPES III.

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Advanced Technology optical Telescopes iii.

ISBN: (纸本)0892526637

This conference proceedings contains 75 papers, one of which is in abstract form only. The major subjects are the following: current developments at the Multiple Mirror Telescope (MMT);National New Technology Telescope (NNTT);site testing;high flying (space) telescopes;arrays and active optics;enclosures, structures, and supports;controls and pointing;optics manufacture, optical design and testing.

关键词： TELESCOPES

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Multi-band filter design with less total film thickness for short-wave infrared 18

Multi-band filter design with less total film thickness for ...

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conference on current developments in lens design and optical engineering XViii

作者： Yan, Yung-Jhe Chien, I-Pen Chen, Po-Han Chen, Sheng-Hui Tsai, Yi-Chun Ou-Yang, Mang Natl Chiao Tung Univ Dept Elect & Comp Engn Hsinchu Taiwan Natl Cent Univ Dept Opt & Photon Taoyuan Taiwan

ISBN: (纸本)9781510612082;9781510612075

A multi-band pass filter array was proposed and designed for short wave infrared applications. The central wavelength of the multi-band pass filters are located about 905 nm, 950 nm, 1055 nm and 1550 nm. In the simulation of an optical interference band pass filter, high spectrum performance (high transmittance ratio between the pass band and stop band) relies on (1) the index gap between the selected high/low-index film materials, with a larger gap correlated to higher performance, and (2) sufficient repeated periods of high/low-index thin-film layers. When determining high and low refractive index materials, spectrum performance was improved by increasing repeated periods. Consequently, the total film thickness increases rapidly. In some cases, a thick total film thickness is difficult to process in practice, especially when incorporating photolithography liftoff. Actually the maximal thickness of the photoresist being able to liftoff will bound the total film thickness of the band pass filter. For the application of the short wave infrared with the wavelength range from 900nm to 1700nm, silicone was chosen as a high refractive index material. Different from other dielectric materials used in the visible range, silicone has a higher absorptance in the visible range opposite to higher transmission in the short wave infrared. In other words, designing band pass filters based on silicone as a high refractive index material film could not obtain a better spectrum performance than conventional high index materials like TiO2 or Ta2O5, but also its material cost would reduce about half compared to the total film thickness with the conventional material TiO2. Through the simulation and several experimental trials, the total film thickness below 4 um was practicable and reasonable. The fabrication of the filters was employed a dual electric gun deposition system with ion assisted deposition after the lithography process. Repeating four times of lithography and deposition p

关键词： optical interference filter Photolithography Bandpass filter Short-wave infrared

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Computational materials science: an increasingly reliable engineering tool (example: defects in HgCdTe alloys)

Computational materials science: an increasingly reliable en...

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conference on Photodetectors - Materials and Devices iii

作者： Sher, A van Schilfgaarde, M Berding, MA SRI Int Menlo Park CA 94025 USA

ISBN: (纸本)0819427268

Computational materials science has evolved in recent years into a reliable theory capable of predicting not only idealized materials and device performance properties, but also those that apply to practical engineering developments. The codes run on workstations and even now are fast enough to be useful design tools. A review will be presented of the current status of this rapidly advancing field. As a demonstration of the power of the methods, predictions of the native point and complex defect, and impurity densities for the Hg-0.8 Cd0.2Te alloy as functions of external processing conditions will be treated. Where measurements have been done, the observed values agree well with the predictions. As an example, we fmd that As incorporates predominately on the cation sublattice, if the material is grown from the Te side of the existence curve las occurs in MBE growth), whereas it tends to reside on the anion sublattice in Hg-saturated growth. On the cation sublattice As is a donor. It is an acceptor on the Te sublattice. We have devised a post-MBE-growth processing method to encourage the transfer of As from the cation to the anion sublattice. Those aspects of the proposed process that have been tested work.

关键词： computational materials science defects in HgCdTe

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