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Conference on optical Systems design - optical Fabrication, Testing, and Metrology v

作者： Muehlig, S. Siepmann, J. Lotz, M. Wiegmann, A. Blobel, G. Mika, S. Beutler, A. Nehse, U. Mahr GmbH D-07745 Jena Germany Mahr GmbH D-37073 Gottingen Germany Phys Tech Bundesanstalt D-38116 Braunschweig Germany

ISBN: (纸本)9781628418170

Two techniques for the measurement of aspheres as well as freeforms are presented. The first method, the tilted wave interferometer, is a full aperture interferometric measurement method without any moving parts during the measurement. The second method applies an optical single point sensor in conjunction with two translational and one rotational axes. Both techniques are compared by measuring a selected asphere and a special freeform surface. Differences between both measurement principles are discussed.

关键词： Twyman-Green interferometer White light interferometry High accuracy cylinder coordinate measuring machine Tilted wave interferometer Asphere and freeform measurement

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Cryogenic Refractive Indices of S-LAH55, S-LAH55v, S-LAH59, S-LAM3, S-NBM51, S-NPH2, S-PHM52, and S-TIH14 Glasses 16

Cryogenic Refractive Indices of S-LAH55, S-LAH55V, S-LAH59, ...

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Conference on current developments in Lens design and optical engineering XvI

作者： Miller, Kevin H. Quijada, Manuel A. Leviton, Douglas B. NASA Goddard Space Flight Ctr Greenbelt MD 20771 USA Leviton Metrol Solut Inc Boulder CO 80301 USA

ISBN: (纸本)9781628417449

The Transiting Exoplanet Survey Satellite (TESS) is an explorer-class planet finder whose principal goal is to detect small planets with bright host stars in the solar neighborhood. The TESS payload consists of four identical cameras with seven lens elements, each made from various Ohara glass. The successful implementation of both the panchromatic and the thermal aspect of these lens assemblies requires accurate knowledge of the thermal and spectral dependence of the refractive index in the wavelength and temperature ranges of operation. Hence, this paper reports measurements of the refractive index for the following Ohara glasses over the wavelength range 0.42 - 1.10 mu m and temperature range 120 300 K: S-LAH55, S-LAH55v, S-LAH59, S-LAM3, S-NBM51, S-NPH2, S-PHM52, and S-TIH14. The measurements were performed using the Cryogenic High Accuracy Refraction Measuring System (CHARMS) facility at NASA Goddard Space Flight Center. Dense coverage of absolute refractive indices of these glasses over the aforementioned wavelength and temperature ranges allowed accurate determination of spectral thermo-optic coefficients (dn/dT) and spectral dispersions (dn/d lambda) as a function of temperature. A comparison of measured, temperature-dependent indices to literature values is presented for S-PHM52 and S-TIH14. A comparison to Ohara's catalog indices at room temperature is presented for all of the materials.

关键词： S-LAH55 S-LAH55v S-LAH59 S-LAM3 S-NBM51 S-NPH2 S-PHM52 S-TIH14 CHARMS cryogenic refractive index

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Towards demonstration of GaAs0.76P0.24/Si dual junction step-cell

Towards demonstration of GaAs0.76P0.24/Si dual junction step...

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2016 IEEE 43rd Photovoltaic Specialists Conference (PvSC)

作者： Sabina Abdul Hadi Tim Milakovich Rushabh Shah Eugene A. Fitzgerald Ammar Nayfeh Department of Electrical Engineering and Computer Science (EECS) Masdar Institute of Science and Technology Abu Dhabi UAE Department of Materials Science and Engineering MIT Cambridge MA USA

ISBN: (纸本)9781509027255

Here we present an initial demonstration of a dual junction step-cell using single junction (SJ) GaAs 0.76 P 0.24 cell, grown on Si 1-y Ge y /Si substrates, as the top cell and Si as the bottom cell. To demonstrate step-cell, two SJ cells are connected in series, without removing SiGe/Si carrier from III-v cell, and illuminated Si cell area is varied. Measured efficiency of optimized demo step-cell under 1 sun and without anti-reflective coating on III-v cell is ~11.8% Using SJ cells characterization and optical data, we estimate maximum efficiency of bonded 1-μm GaAs 0.76 P 0.24 // 650-μm Si step-cell to be ~26% at optimized total-to-top cell area ratio equal to 1.1. Results presented here show that step-cell can be used as added optimization design parameter for tandem cells.

关键词： Silicon optical filters current measurement Junctions Mathematical model Photovoltaic cells optical buffering

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Photonic techniques for wideband signal processing

Photonic techniques for wideband signal processing

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IEEE Conference on Avionics Fiber-Optics and Photonics, AvFOP

作者： W. Ng Department of Electrical Engineering University of Southern California Los Angeles CA

The advantages of using the broadband and low-loss distribution attributes of photonics to enhance the sensing capabilities of microwave systems are well known. In this talk, we review the salient features of photonics that allow them to make unique contributions towards ultra-wideband signal processing. A key component used in the RF-photonic links of these applications is the electro-optic modulator (EOM), typically of the Mach Zehnder (MZ) design. We first present, in Section 2, an optical sideband measurement approach (2) that allows us to characterize the microwave response and RF-v of MZ EOMs at frequencies beyond those supported by current swept-frequency instrumentation. In Sections 3 and 4, we summarize, respectively, the progress made in the topical areas of wideband photonic-assisted analog-to-digital conversion (ADC) and RF-photonic filtering.

关键词： Photonics Frequency measurement optical variables measurement Microwave filters optical mixing Amplitude modulation optical filters

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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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In situ codoping of a CuO absorber layer with aluminum and titanium: the impact of codoping and interface engineering on the performance of a CuO-based heterojunction solar cell

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JOURNAL OF PHYSICS D-APPLIED PHYSICS 2016年第37期49卷

作者： Masudy-Panah, Saeid Radhakrishnan, K. Ru, Tan Hui Yi, Ren Wong, Ten It Dalapati, Goutam Kumar ASTAR Inst Mat Res & Engn 3 Res Link Singapore 117602 Singapore Nanyang Technol Univ Sch Elect & Elect Engn Nanoelect Ctr Excellence NOVITAS Singapore 639798 Singapore

Aluminum-doped cupric oxide (CuO:Al) was prepared via an out-diffusion process of Al from an Al-coated substrate into the deposited CuO thin film upon thermal treatment. The effect of the annealing temperature on the structural and optical properties of CuO: Al was investigated in detail. The influence of Al incorporation on the photovoltaic properties was then investigated by preparing a p-CuO: Al/n-Si heterojunction solar cell. A significant improvement in the performance of the solar cell was achieved by controlling the out-diffusion of Al. A novel in situ method to co-dope CuO with Al and titanium (Ti) has been proposed to demonstrate CuO-based solar cells with the front surface field (FSF) design. The FSF design was created by depositing a CuO: Al layer followed by a Ti-doped CuO (CuO: Ti) layer. This is the first successful experimental demonstration of the codoping of a CuO thin film and CuO thin film solar cells with the FSF design. The open circuit voltage (v-oc), short circuit current density (J(sc)) and fill factor (FF) of the fabricated solar cells were significantly higher for the FSF device compared to devices without FSF. The FF of this device improved by 68% through the FSF design and a record efficiency n of 2% was achieved. The improvement of the solar cell properties is mainly attributed to the reduction of surface recombination, which influences the charge carrier collection.

关键词： in situ codoping front surface field (FSF) design CuO-based heterojunction solar cell

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Recent developments in precision optical coatings prepared by cylindrical magnetron sputtering 5

Recent developments in precision optical coatings prepared b...

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optical Systems design 2015: Advances in optical Thin Films v

作者： Bruns, Stefan vergöhl, Michael Zickenrott, Tobias Fraunhofer Institute for Surface Engineering and Thin Films IST Bienroder Weg 54E Braunschweig38108 Germany

ISBN: (纸本)9781628418163

Cylindrical targets give the opportunity to improve the process stability of magnetron sputtering processes although reactive deposition might be a challenge. Sputtering from metal doped oxide targets in connection with a plasma source unlocks the full potential: The process can be driven in well-known mid-frequency mode and the plasma source ensures fully stoichiometric films with low loss. During the last years different developments for oxide cylindrical targets were done. The suitable composition has to be found regarding *** density and an arc-free process as familiar for planar targets. In the tube geometry new manufacturing methods are required that ensure these properties. In the present paper we show some examples of the high refractive index materials tantalum oxide: single film characterization as well as realized complex precision optical filters. The results are accompanied by performance measurements in terms of uniformity over 200 mm glass wavers as well as carrier to carrier and batch to batch. These were measured by the position of a quarter-wave stackâ€™s edge. © 2015 SPIE.

关键词： Magnetron sputtering

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A new preprocessing and control board for the phase 2 electronics of AGATA experiment

A new preprocessing and control board for the phase 2 electr...

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IEEE NPSS Conference on Real Time

作者： J. Collado J. M. Blasco N. Dosme v. González X. Grave N. Karkour X. Lafay E. Legay D. Linget E. Sanchis Department of Electronic Engineering University of Valencia School of Engineering Burjassot (Valencia) SPAIN

ISBN: (纸本)9781509020157

The electronics of AGATA HPGe segmented gamma ray detector faces a new challenge in the search of a bigger integration and cost reduction for the phase 2 of the experiment going beyond 45 crystals. This opportunity can be used to introduce a new architecture based on commercial standards while keeping backward compatibility with current electronics. In this sense, new FPGA devices and fast Ethernet links can be used to ease the preprocessing and control task and allowing for processor farms to distribute the processing load. At the same time, modularity should be a key feature of the design in the aim to make it upgradable in time and technology. This paper presents the design of a new preprocessing and control board that could fulfill with the experiment requirements having in mind that it should not be only a new system but also should serve as replacement of the current electronics. The design is intended to process the data coming from 3 crystals (114 channels) in the same board, with a total aggregate bandwidth of 216 Gpbs using 2 Gbps input optical fiber links in SNAP12 format and with a data readout done through Ethernet fiber optics. It is expected that, with this new system, the level of integration will raise up to 3 times while cost will scale down a 30% with respect to the current electronics.

关键词： Field programmable gate arrays Indexes Crystals Process control Decision support systems Biomedical imaging Instruments

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design and simulation of proposed low cost solar cell structures based on heavily doped silicon wafers

Design and simulation of proposed low cost solar cell struct...

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2016 IEEE 43rd Photovoltaic Specialists Conference (PvSC)

作者： M. S. Salem A. Zekry A. Shaker M. Abouelatta Department of Computer Engineering Hail University KSA Department of Elec. and Comm. Eng. Ain Shams University Cairo Egypt Department of Eng. Physics and Mathematics Ain Shams University Cairo Egypt

ISBN: (纸本)9781509027255

This paper aims to present the design and simulation of two proposed low cost solar cell structures; namely, pn and npn. Both structures are based on commercially available low cost heavily doped silicon wafers. Their operation relies on the idea of vertical generation and lateral collection of the light generated carriers. A detailed qualitative analysis of both structures is given and verified using advanced TCAD tools. The comparison is analyzed firstly regarding the illuminated Iv characteristics. The open circuit voltage (v oc ), short circuit current density (J sc ), fill factor (F.F) and conversion efficiency (η) are calculated. Additionally, the optical performance is calculated and compared for both structures. The quantum efficiency, the spectral response and the absorption curve are compared. The presented results show that npn structure gives better electrical and optical performance than the pn one.

关键词： Photovoltaic cells Silicon Absorption Junctions Short-circuit currents optical device fabrication

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Dynamic optical Data Center Network Load Balancing and Resource Allocation

Dynamic Optical Data Center Network Load Balancing and Resou...

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IEEE Global Communications Conference

作者： Henna Huang vincent W. S. Chan Department of Electrical and Computer Engineering University of Waterloo Ontario Canada Khalifa University of Science Technology and Research Abu Dhabi United Arab Emirates

ISBN: (纸本)9781509013296

We highlight the advantages of dynamic wavelength allocation and path rerouting in hybrid optical flow-switched data center networks compared with static electronic packet-switched data center networks. current electronic packet-switched networks perform routing based on lookup tables and shortest path routing over high speed optical connections. However, load balancing and path rerouting are not designed in coordination with the optical data plane. In this work, we design and analyze the performance of load balancing and resource allocation in hybrid flow data center architectures. In the hybrid flow architecture, the transport layer and control plane are responsible for load balancing, congestion control and reliable data delivery in wavelength division multiplexed networks. The transport layer abstracts the underlying network and data link layers from user applications. Applications are unaware of whether flows are transmitted via the electronic data plane, optical data plane, or both, where the relevant metric for applications is transaction delay. We show that the data center architecture that minimizes delay in the presence of elephant flows and dynamic loads is the hybrid flow architecture with dynamic resource allocation.

关键词： Data center Dynamic optical network Load balancing Path assignment Load balancing data center Resource utilization transport layer wavelength assignment ARCHITECTURE Building construction management of resources shortest-path routing Table lookup optical control surfaces

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