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7th International conference on optical and Photonic engineering (icOPEN)

作者： Hegde, Sapthami Anchan, Bhavana Kamath, Saritha U. Kini, Sudarshan De, Shounak Patil, Ajeetkumar MAHE Dept Atom & Mol Phys Manipal 576104 India MAHE Manipal Coll Hlth Profess Dept Med Lab Technol Manipal India Nitte Ctr Sci Educ & Res Biomed Sci Mangalore 575018 India MAHE MIT Dept Elect & Commun Engn Manipal 576104 India

ISBN: (数字)9781510631601

ISBN: (纸本)9781510631601

Zinc oxide is a preferred choice for several optoelectronic applications owing to their unique properties, such as wider band gaps combined with high exciton binding energies. A zinc oxide thin film was grown on glass substrates through sol-gel depositing method followed by heat treatments. We prepared the zinc oxide thin films using zinc acetate dihydrate, 2-methoxy ethanol and diethanolamine as zinc alkoxide precursor, solvent and sol stabilizer respectively. Structural and optical characterizations were carried out that included X-ray diffraction, Atomic force microscopy, Profilometry and Uv-visible spectrophotometry. A coplanar configuration of device has been chosen where the structure has Zinc oxide thin film on which metal contacts of 100 nm thickness were deposited onto the films via thermal evaporation. A two probe source meter was used for I-v measurements in dark environment. I-v measurements have been done for various concentrations of biomolecules (vitamin B6). It is found that there are variations in current for increasing concentrations.

关键词： Metal oxide thin film Biosensor Iv characteristics vitamin B molecules

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optical designs of the objectives for special studies in polarizing microscope 19

Optical designs of the objectives for special studies in pol...

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

作者： Frolov, Dmitry N. vinogradova, Olga A. Frolov, Alexey D. Tabachkov, Alexey G. Project Labor Microscopes Zapovednaya St 51A St Petersburg 194356 Russia

Presents the results of the optical design of lens objectives for polarization light microscopes, including to ensure that the special techniques. Sometimes such methods require the use of objectives similar magnifica... 详细信息

ISBN: (数字)9781510620629

ISBN: (纸本)9781510620629

关键词： Microscopy Lens system design optical design and fabrication Objectives for microscopes Lens objectives system design Objectives for polarizing microscopes Polarizing microscopy

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Experimental study of power-limiting factors of 1.1 μm range edge-emitting lasers based on InGaAs/GaAs quantum well-dot nanostructures 6

Experimental study of power-limiting factors of 1.1 μm rang...

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6th International School and conference on Optoelectronics, Photonics, engineering and Nanostructures, SPbOPEN 2019

作者： Serin, A.A. Payusov, A.S. Kornyshov, G.O. Shernyakov, Yu.M. Mintairov, S.A. Kalyuzhnyy, N.A. Kulagina, M.M. Zhukov, A.E. Gordeev, N.Yu. Maximov, M.v. Ioffe Institute 26 Polytechnicheskaya St Petersburg194021 Russia St. Petersburg Academic University 8/3 Khlopina St Petersburg194021 Russia

We present a study of high-power characteristics of edge-emitting lasers based on quantum well-dots (QWD) in a pulsed regime. QWD-based lasers with 2 and 5 active layers emitting at ∼1.1 μm provided maximal optical power of 39 W limited by the pulse current source available. We have investigated the lasing spectra and shown that under the injection current above 20 kA/cm2 the active region overheats approximately by 0.5°C per 1 kA/cm2 during 100 ns current pulse. The active region overheating correlates well with the reducing of the differential efficiency of our devices. We believe that maximal pulse optical power of the QWD-based lasers is limited mainly by our laser wafer design rather than by the QWD active media properties. © Published under licence by IOP Publishing Ltd.

关键词： Semiconductor quantum wells

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optical design of CCF PlanApo microobjectives 50 mm observation and super long working distance 19

Optical design of CCF PlanApo microobjectives 50 mm observat...

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

作者： Frolov, Dmitry N. vinogradova, Olga A. Frolov, Alexey D. Wen, Liyun Jing, Fanhua Project Labor Microscopes Zapovednaya St 51A St Petersburg 194356 Russia Kozo Opt Ltd 19E18 Zhenghong St Nanjing Jiangsu Peoples R China

The main difference is a significant expansion of the linear field, which reaches 50 mm in the image plane. However, in this case, a planapochromatic correction must be achieved for the usual visible spectral range. S... 详细信息

ISBN: (数字)9781510620629

ISBN: (纸本)9781510620629

关键词： Lens system design optical design and fabrication Microscopy Objectives for microscopes

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Integrated multi-objective optimisation of the support structure of heliostats in concentrated solar power plants using a genetic algorithm

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IOP conference Series: Materials Science and engineering 2022年第1期1214卷

作者： L Lomazzi F Cadini M Giglio C Cancro G Ciniglio G Graditi A Pontecorvo Politecnico di Milano Department of Mechanical Engineering Via La Masa n.1 Milan Italy Italian National Agency for New Technologies Energy and Sustainable Economic Development ENEA – Research Center Piazza E. Fermi 1 80055 Portici (NA) Italy

The optimisation of the support structure of heliostats in concentrating solar power plants is a fundamental task aimed at attempting to reduce the high levelised cost of energy (LCOE) of current configurations. In this work, an integrated multi-objective optimisation framework is presented, which relies on the combination of a lean and fast structural model with a genetic algorithm to simultaneously minimise both the overall mass of the support structure and the mean angle of rotation of the mirror surface, which directly affects the optical efficiency of the component. A particular feature of the proposed framework is that it represents an integrated solution, i.e., it allows to simultaneously optimise the main components of the heliostat support structure, i.e., the pedestal, the truss and the back support structure, assuming they are off-the-shelf components easily available on the market. The optimisation problem is set up selecting as design variables (i) the number of elements in the back support structure and (ii) the relevant characteristics of all the components considered, i.e., section shape and dimensions, according to the components commercial datasheets. At each iteration of the optimisation process, the structural model is fed with the current design variables values and, according to some computed aerodynamic loads, it allows evaluating the displacement and rotation of the points of interest within the mirror surface. An aerodynamic model present in the literature based on experimental wind tunnel tests is used to estimate the wind forces acting on the heliostat as a function both of the mirror inclination angle with respect to the ground and of the wind direction with respect to the mirror orientation. In this work, the proposed methodology is demonstrated on a realistic case study and the results commented in detail, highlighting possible future developments and the limitations of the framework.

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design of a Low-Energy and High-current-Density Ion Beam System in RF Source

Design of a Low-Energy and High-Current-Density Ion Beam Sys...

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Electrical engineering (CIYCEE), IEEE China International Youth conference on

作者： Feng Xue Chen Zuo Dong Li Kaifeng Liu Dezhi Chen Jie Gong State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9781728196596

ISBN: (纸本)9781728196602

Hydrogen ions with low energy around 100 ev are broadly utilized in material science as hydrogen implantation in multi-material integration or dry cleaning of material surface. A low-energy ion beam system is designed using a radio frequency (RF) source to extract high-density hydrogen ions with energy of 100 ev, consisting of the plasma generator and extraction system. A triode system is designed to extract ion beam and control ion energy by means of an accelerating-deaccelerating structure with about 4500 v potential drop. The ion beam optics is simulated through a particle trajectories code with the aim of reducing beam divergence and ion loss to extract high density ions, optimizing beam extraction characteristic for sensitive parameters. The results show that ion beam of a high density of 91.96 A/m 2 with adjustable energy from 75 to 100 ev can be obtained by adjusting extraction electrode (EE) potential, sliming the thickness of EE and matching the radius of apertures carefully.

关键词： Radio frequency Hydrogen Apertures Ions Trajectory optical beams Ion beams

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design and Prototyping of a Freeform Light-Guide for Automotive Lighting 19

Design and Prototyping of a Freeform Light-Guide for Automot...

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

作者： Brand, Audrey C. Alisafaee, Hossein Rose Hulman Inst Technol Dept Phys & Opt Engn 5500 Wabash Ave Terre Haute IN 47803 USA

ISBN: (数字)9781510620629

ISBN: (纸本)9781510620629

We have designed a light-guide for lighting applications, including automotive headlamps. The light-guide is designed based on a free-form slab. Our intention has been to optimize the design for creating legal patterns. One of our objectives has been to investigate how the changes in the shape of the freeform light-guide affects the light pattern, and how the light source geometry affects the design. For prototyping purpose, we use a particular polymer that exhibits optical performance close to acrylic (PMMA).

关键词： Automotive Lighting Lighting Light-guide optical design Illumination

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optical design of LED Marine Beacons 19

Optical Design of LED Marine Beacons

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

作者： Lin, Shih-Kang Jen, Yung-Chang Lee, Xuan-Hao Yu, Yeh-Wei Yang, Tsung-Hsun Sun, Ching-Cherng Natl Cent Univ Dept Opt & Photon Chungli 32001 Taiwan Natl Cent Univ Opt Sci Ctr Taoyuan 32001 Taiwan

ISBN: (数字)9781510620629

ISBN: (纸本)9781510620629

Two optical designs for marine beacon based on Direct In-line Package (DIP) LED is proposed and demonstrated. The luminous intensity of the marine beacon using DIP LED can achieve to the IALA recommendation's requirement of 5 nautical miles. The measurement of color coordinates can also fit the IALA recommendation's requirement. By the surface-structured TIR lens, we successfully keep the divergence angle to 68 degrees in the horizontal direction and converge to 8 degrees in the vertical direction.

关键词： DIP LED optical design marine beacons IALA

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design and analysis of the mirror system with off-axis field-of-view 19

Design and analysis of the mirror system with off-axis field...

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

作者： Romanova, Galina E. Rodionova (Butylkina), Kseniia D. ITMO Univ 49 Kronverkskiy Pr St Petersburg 197101 Russia

ISBN: (数字)9781510620629

ISBN: (纸本)9781510620629

Nowadays, the development of the space apparatus with high optical characteristics still stays the important task. The simplest systems which can provide the required characteristics for remote monitoring from the space are the three-mirror systems. It can be shown that in many cases, classical three-mirror systems have critical value of obscuration that leads to decreasing of resolution. Using off-axis field of view in the systems provides the way to avoid the obscuration influence. We present a technique for designing the three-mirror telescope objectives based on the systems with axial symmetry with an off-axis field of view.

关键词： mirror telescopes off-axis field of view optical design

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A CRITICAL TOPOLOGICAL REvIEW FOR MICROWAvE POWER MODULES

A CRITICAL TOPOLOGICAL REVIEW FOR MICROWAVE POWER MODULES

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The 10th International conference on Power Electronics, Machines and Drives (PEMD 2020)

作者： J. M. Holland v. Pickert M. A. Elgendy G. Henderson School of Engineering Newcastle University Newcastle United Kingdom TMD Technologies London United Kingdom

Recently, developments in Microwave Power Module (MPM) technologies have transformed to adapt to wider varieties of emerging radar and communication system needs. A renewed interest in MPM technology has emerged due to the possibility of significant reductions in size, weight, and efficiency when compared to standalone solid-state and travelling wave tube (TWT) amplifier systems. designing the electronic power conditioner (EPC) for an MPM is not a trivial task. The need to reduce both size and weight is in direct conflict with the required specification of an MPM, which requires multiple high voltage outputs in the kilovolt range with very low steady-state and dynamic output voltage ripple to ensure phase-noise stability of the tube. Furthermore, the transient behaviour of the MPM is particularly challenging, with output pulsing schemes ranging from long, slow pulses for high position fidelity and short, fast pulses for accurate dynamic tracking. During this time, the TWT beam current changes from full load to zero load. This paper focusses on the design of the EPC and outlines a critical analysis of the key enabling technological factors and topological choices that demonstrate how to meet such demanding specifications, and how standard approaches will most likely be sub-optimum.

关键词： travelling wave amplifiers microwave tubes phase noise transient analysis

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