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current developments in Lens design and optical engineering XI;and Advances in Thin Film Coatings VI

Current Developments in Lens Design and Optical Engineering ...

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current developments in Lens design and optical engineering XI;and Advances in Thin Film Coatings VI

ISBN: (纸本)9780819482822

The proceedings contain 35 papers. The topics discussed include: CCT-dependent calibration for colorimeters;high performance of color mixing and projection lighting based on color LEDs;research on angle-selective filters of phosphor color wheel for LED projectors;high-efficiency LED street light using micro-lens array;optical performance as a function of phosphor particle number in white LED;a novel approach for structural synthesis of zoom systems;accelerating diffractive optics design with GPU-based parallel technique;ultra-compact close-up microoptical imaging system;design and implementation of recording and readout system for micro-holographic optical data storage;perceptual image quality and telescope performance ranking;ion-beam figuring (IBF) for high-precision optics becomes affordable;and flat liquid crystal diffractive lenses with variable focus and magnification.

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Deep UV LEDs

Deep UV LEDs

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International Symposium Semiconductor Device Research (ISDRS)

作者： Remis Gaska Sensor Electronic Technology Inc. USA

Summary form only given. iii-Nitride semiconductor-based Deep UV (DUV) LEDs are emerging as an enabling technology for diverse military, homeland security, industrial and commercial markets and space exploration. current technology allows to fabricate AlGaN-based DUV LEDs with wall-plug efficiency (WPE) between 1-2%, which is substantially lower that WPE for visible and near UV LEDs. Significant R&D efforts are under way, including DARPA's “Compact Mid-Ultraviolet Technology” (CMUVT) program, to improve materials quality, device fabrication and light extraction to increase WPE of DUV LEDs by more than order of magnitude. We will present an overview of our latest developments in the development of DUV LED technology with the main focus on novel device designs to increase quantum efficiency and improve UV light extraction and reliability of devices emitting in the range of 230 nm 340 nm. Novel QW design has been implemented to suppress polarization effects and phonon engineering approach to increase electron trapping in the active layer of the devices. Very narrow (; 0.4 eV) quantum wells were used to suppress Stark effect and increase radiative recombination. Active region of DUV LEDs was embedded inside a deep potential well (larger than the energy of optical phonon) to increase electron-LO phonon scattering and accelerate cooling of hot injected electrons. This allowed us to increase electron capture into the active region without using conventional electron "blocking layer" commonly used in visible LEDs We developed and incorporated UV-transparent p-type cladding layers to reduce optical losses due to strong absorption in the top p-AlGaN cladding layer and p+-AlGaN or p+-GaN contact layers. Combination with new type of ohmic contact reflecting in DUV spectral range allowed us to significantly improve light extraction and increase output power of DUV LEDs by 2 times in the range of 275 nm - 300 nm and 2.5 times in the range from 310 nm to 340 nm. Improved quality o

关键词： Light emitting diodes Phonons Semiconductor device reliability optical reflection optical device fabrication

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The potential role of Bismide alloys in future photonic devices

The potential role of Bismide alloys in future photonic devi...

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International Conference on Transparent optical Networks

作者： S. J. Sweeney Z. Batool K. Hild S. R. Jin T. J. C. Hosea Advanced Technology Institute and Department of Physics University of Surrey Guildford Surrey UK Department of Physics and Ibnu Sina Institute Faculty of Science Universiti Teknologi Malaysia Skudai Johor Malaysia

In a similar manner to the dilute nitrides, the incorporation of Bismuth in semiconductors such as GaAs is predicted to lead to a band-anti-crossing effect (in the valence band) causing a large band gap bowing. In addition, the large size of Bismuth atoms gives rise to a large spin-orbit splitting. This opens-up interesting new possibilities for efficient photonic devices, such as near- and mid-infrared lasers which are more thermally stable and less susceptible to losses compared to conventional InP-based devices. Since Bismuth principally influences the valence band, while nitrogen influences the conduction band, combining Bismuth and Nitrogen in iii-V alloys offers huge potential for engineering the conduction and valence band offsets, the band gap and spin-orbit splitting, with wide scope for the design of photonic devices.

关键词： Bismuth Photonic band gap Gallium arsenide Nitrogen Threshold current Temperature sensors

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optical design of the JWST Fine Guider Sensor

Optical Design of the JWST Fine Guider Sensor

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Conference on current developments in Lens design and optical engineering XI - and Advances in Thin Film Coatings VI

作者： Zheng, Sheng Hai Evans, Clinton COMDEV Int Ltd Ottawa ON K2K 3J1 Canada

ISBN: (纸本)9780819482822

The Fine Guidance Sensor (FGS) is part of the science instrumentation for the James Webb Space Telescope (JWST). The FGS is required to operate at 37 K and provide the data needed to facilitate fine pointing and attitude stabilization necessary to meet the requirements of the mission's science and engineering operations. We describe here the selection of the proper optical design form to meet requirements and its relative merits. The FGS has progressed with the successful completion of several key design reviews. The optical design of the current stage will be discussed here in detail.

关键词： Fine guidance sensor FGS James Webb space telescope JWST

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design and Implementation of Recording and Readout System for Micro-holographic optical Data Storage

Design and Implementation of Recording and Readout System fo...

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Conference on current developments in Lens design and optical engineering XI - and Advances in Thin Film Coatings VI

作者： Takashima, Yuzuru Hesselink, Lambertus Stanford Univ Dept Elect Engn Stanford CA 94305 USA

A lens design having constant working distance while having variable recording depth for micro holographic data storage system has been proposed. Variation of focal length is suppressed for the entire depth within 1% ... 详细信息

ISBN: (纸本)9780819482822

关键词： Holographic Storage Aberrations Lens design

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Characterization of Feathering of optical Coating

Characterization of Feathering of Optical Coating

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Conference on current developments in Lens design and optical engineering XI - and Advances in Thin Film Coatings VI

作者： Buchholz, Chris Krevor, David Rockwell Collins Heads Up Guidance Syst HGS Wilsonville OR 97070 USA

ISBN: (纸本)9780819482822

This paper discusses a method to characterize feathering and determine feathering quality. The characterization is based upon the change of the color coordinate across the transition region. "Feathering" of an optical coating is the gradual taper, without any discernible boundary, from a coated to uncoated region. There can be various reasons why a thin film optical coating may not be applied to the entire surface of a see-through article. Feathering is necessary when the viewer, looking through a transmissive element, is focused on the far-field and would be distracted by a coating boundary which redirects focus to the near field. Done incorrectly, feathering may produce visible artifacts which are ineffective and objectionable to the user. Examples are provided.

关键词： optical coating beamsplitter feather feathering display combiner color coordinate taper

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Dynamic modeling of optical systems in order to study vibration effect on performance

Dynamic modeling of optical systems in order to study vibrat...

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Conference on current developments in Lens design and optical engineering XI - and Advances in Thin Film Coatings VI

作者： Avsar, Ahmet Levent Ozguven, H. Nevzat ASELSAN Inc MGEO Headship PK 30 TR-06011 Ankara Turkey Middle E Tech Univ Dept Engn Mech TR-06531 Ankara Turkey

ISBN: (纸本)9780819482822

In order to determine the vibration effects on performance in optical system, a simple vibratory model is proposed. The model suggested is compared with FE model. Both models are validated by modal tests for an existing simple optical system. The material properties of adhesive, which play an imported role in the vibratory model of an optical system, are found experimentally by using a simple test setup. The model suggested is used to investigate the dynamic behavior of the optical system under random vibration load conditions. It is concluded in this study that the analytical model suggested can successfully be used in preliminary design stage of simple optical systems when optical housing and lens behave rigidly in the frequency range of interest.

关键词： Dynamic Analysis optical Performance optical System

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Ultra-compact close-up microoptical imaging system

Ultra-compact close-up microoptical imaging system

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Conference on current developments in Lens design and optical engineering XI - and Advances in Thin Film Coatings VI

作者： Brueckner, Andreas Duparre, Jacques Wippermann, Frank Leitel, Robert Dannberg, Peter Braeuer, Andreas Fraunhofer Inst Appl Opt & Precis Engn D-07745 Jena Germany

ISBN: (纸本)9780819482822

Although several applications of machine vision and biomedical imaging ask for the close-up imaging of extended object fields, only few, mostly bulky solutions exist. We demonstrate the optical design and realization of an ultra-compact close-up imaging system with unity magnification. It uses a multi-aperture approach in order to shorten its total track length to less than 4 mm while achieving a large field of view. The system is made of a stack of several two-dimensional arrays of refractive microlenses. The potential of this setup lies in the combination of digital imaging with microoptical fabrication techniques leading to thin optical components which can be directly attached to an image sensor. Hence, these systems fit into tight spaces and they achieve a high resolution without scanning.

关键词： Imaging imaging systems microoptics optical design image processing multichannel multi-aperture cameras vision image sensors

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Spin relaxation torque and spin transport in metallic ferromagnets

Spin relaxation torque and spin transport in metallic ferrom...

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Conference on Spintronics iii

作者： Tatara, Gen Takeuchi, Akihito Nakabayashi, Noriyuki Tokyo Metropolitan Univ Dept Phys Tokyo 1920397 Japan

ISBN: (纸本)9780819482563

We overview the recent developments in spin current generation mechanisms and study the spin pumping effect and diffusive spin current in detail based on a microscopic theory. The spin-charge conversion using the inverse spin Hall effect is also discussed. Spin chemical potential describing the diffusive spin current is calculated by linear response theory and spin injection effect is discussed based on the result.

关键词： Spin current spin relaxation

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Diffraction depth of focus in optical microscope

Diffraction depth of focus in optical microscope

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Conference on current developments in Lens design and optical engineering XI - and Advances in Thin Film Coatings VI

作者： Borovytsky, Volodymyr Fesenko, Andrey Nat Techn Univ Ukraine KPI Opt Eng Dept UA-03056 Kiev Ukraine

ISBN: (纸本)9780819482822

The paper presents the mathematical technique for calculation of the diffraction depth of focus of an optical system of a widefield microscope. The proposed technique applies the Rayleigh criterion based on evaluation of the wave aberration appeared due to defocus in a high aperture optical system. The maximal value of a linear approximation of the defocus wave aberration is used to define the depth of focus. It is proven that in optical systems with numerical aperture higher than 0.5 have the diffraction depth of focus 25 - 40% smaller than the widely known formula defines. This fact is important for implementation of autofocus and digital focus extension algorithms. The non-sophisticated formula for calculation of the depth of focus is proposed. The results of experimental measurements of the depth of focus are presented and discussed.

关键词： depth of focus wave aberration image quality Rayleigh criterion Marechal criterion

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