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Light-Emitting Devices, Materials, and Applications XXIX 2025

作者： Nähle, L. Gerhard, S. Somers, A. Jama, M.G. Lawrowski, R. Borovac, D. Eichler, C. Brüderl, G. Tautz, S. Heidemann, M. Reiger, E. Gosain, S. Jentzsch, B. Haimerl, M. Heine, U. Wurm, T. Malm, N. von Behringer, M. Mu, X. Sacher, W.D. ams-OSRAM International GmbH Leibnizstr. 4 Regensburg93055 Germany Max Planck Institute of Microstructure Physics Weinberg 2 Halle06120 Germany

ISBN: (纸本)9781510685208

While InGaN based lasers in the blue and green wavelength range have developed into well-established light sources over the last two decades, there is of course a constant drive to raise performance, lower price and enable new device designs. This publication discusses options for laser designs involving etched planes and facets that can drastically reduce production costs and at the same time offer opportunities for new device concepts. It also presents our newest results on high-power lasers in the blue wavelength range. First, InGaN lasers produced with etched facets are compared to state-of-the-art edge emitters. Tilt-angles and on-wafer mirror layer roughness are identified as the main contributors to the existing performance gap, mainly manifesting itself in a ~10 mA threshold current difference for devices with 400 µm resonator length. Following this, the application of the technology of smooth m-plane etching for the fabrication of nano-fins is demonstrated and an application example of a laser with etched facets in a photonic integrated circuit (PIC) is shown. In the second part of the paper, we describe the main improvements that our blue high-power InGaN chips experienced through epi and chip design optimization. Power conversion efficiencies (PCE) of 50% and above have been reached and a multi-die-package comprising several blue power lasers is demonstrated. © 2025 SPIE.

关键词： III-v semiconductors

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current developments in lens design and optical engineering II

Current developments in lens design and optical engineering ...

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current developments in Lens design and optical engineering II

The proceedings contained 20 papers from the journal on current developments in Lens design and optical engineering. The topics discussed included: optics for binocular telescopes;enhancements to the optimization proc... 详细信息

关键词： optical engineering

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Performance Analysis of Improved Linear Sinusoidal Tracer Controlled Single-Stage and Dual-Stage Three-Phase Grid-Tied Pv System

Performance Analysis of Improved Linear Sinusoidal Tracer Co...

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Smart and Sustainable developments in Electrical engineering (SSDEE), IEEE International Conference on

作者： Urvashiben Rathod Darsh v. Pawar Siddharthsingh K. Chauhan Abhisek Parida P. N. Tekwani Dept. of Electrical Engineering Institute of Technology Nirma University Ahmedabad India

ISBN: (数字)9798331542108

ISBN: (纸本)9798331542115

This paper compares single-stage and dual-stage Improved Linear Sinusoidal Tracer (ILST) based three-phase grid-tied photovoltaic (Pv) systems. These systems facilitate the integration of solar energy into grid while improving the power quality of the distribution network. This design incorporates Maximum Power Point Tracking (MPPT), Pv power injection into the grid, harmonic reduction at the Point of Common Coupling (PCC), and grid current balancing. Both single-stage and dual-stage configurations utilize a three-phase voltage source converter (vSC) controlled by an ILST algorithm. The single-stage and dual-stage systems are modeled and simulated using MATLAB. This ILST control algorithm of grid-tied Pv system helps to maintain Total Harmonic Distortion (THD) of PCC voltages and grid currents within prescribed limits.

关键词： Maximum power point trackers Transient response Total harmonic distortion Power quality Power system harmonics Harmonic analysis voltage control MATLAB Sustainable development voltage-source converters

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Quantum dots solar cells: Materials innovation, device engineering, and emerging applications

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Materials Science in Semiconductor Processing 2025年 196卷

作者： Baskaran, S. Sree Rathna Lakshmi, N.v.S. Lakshmi Narayana, A. Arul Murugan, C. Department of Electronics and Communication Engineering SKP Engineering College Tamil Nadu Tiruvannamalai606 611 India Department of Electronics and Communication Engineering SRM Institute of Science and Technology Ramapuram Tamilnadu Chennai600 089 India Department of Electronics and Communication Engineering Aditya University Surampalem Andhra Pradesh 533 437 India Department of Electronics and Telecommunication Engineering Karpagam College of Engineering Tamil Nadu Coimbatore641 032 India

Quantum dot solar cells (QDSCs) have emerged as promising candidates for next-generation photovoltaic technologies owing to their unique optoelectronic properties and solution-processability. This critical review examines the evolution and current state of QDSC research spanning over two decades. We trace the progression from early theoretical concepts to recent experimental breakthroughs achieving power conversion efficiencies exceeding 18 % with perovskite quantum dots. The review systematically analyzes quantum confinement effects, materials development pathways, device architectures, and performance enhancement strategies. We critically assess three primary material systems: lead chalcogenides (PbS, PbSe, PbTe), which have demonstrated excellent spectral tunability and near-infrared harvesting;cadmium-based compounds (CdS, CdSe, CdTe), which provided the foundation for early developments;and perovskite quantum dots (CsPbI3, FAPbI3), which represent the current efficiency leaders. Surface engineering emerges as critical for performance, with sophisticated passivation and ligand exchange strategies driving remarkable efficiency improvements. We examine the transformative role of interface design in facilitating charge extraction while minimizing recombination, alongside notable innovations in flexible devices for emerging applications. While substantial challenges remain in stability, scalability, and environmental sustainability, recent progress in environmentally friendly alternatives, defect management, and transport layer optimization suggests pathways toward commercial viability. The review concludes by identifying promising research directions, including tandem integration, advanced characterization techniques, computational design, and machine learning-assisted discovery. This comprehensive analysis provides a framework for understanding quantum dot solar cells' position in the renewable energy landscape and outlines strategic pathways toward realizing thei

关键词： Sustainable development

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Portable six-channel laser speckle system for simultaneous measurement of cerebral blood flow and volume with potential applications in characterization of brain injury

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Neurophotonics 2025年第1期12卷 015003页

作者： Mahler, Simon Huang, Yu Xi Ismagilov, Max Álvarez-Chou, David Abedi, Aidin Tyszka, J. Michael Lo, Yu Tung Russin, Jonathan Pantera, Richard L. Liu, Charles Yang, Changhuei California Institute of Technology Department of Electrical Engineering PasadenaCA United States University of Southern California USC Neurorestoration Center Department of Neurological Surgery Los AngelesCA United States California Institute of Technology Division of Humanities and Social Sciences PasadenaCA United States Rancho Los Amigos National Rehabilitation Center DowneyCA United States Kaweah Health Medical Center Neurology VisaliaCA United States

Significance: Cerebral blood flow (CBF) and cerebral blood volume (CBv) are key metrics for regional cerebrovascular monitoring. Simultaneous, non-invasive measurement of CBF and CBv at different brain locations would advance cerebrovascular monitoring and pave the way for brain injury detection as current brain injury diagnostic methods are often constrained by high costs, limited sensitivity, and reliance on subjective symptom reporting. Aim: We aim to develop a multi-channel non-invasive optical system for measuring CBF and CBv at different regions of the brain simultaneously with a cost-effective, reliable, and scalable system capable of detecting potential differences in CBF and CBv across different regions of the brain. Approach: The system is based on speckle contrast optical spectroscopy and consists of laser diodes and board cameras, which have been both tested and investigated for safe use on the human head. Apart from the universal serial bus connection for the camera, the entire system, including its battery power source, is integrated into a wearable headband and is powered by 9-v batteries. Results: The temporal dynamics of both CBF and CBv in a cohort of five healthy subjects were synchronized and exhibited similar cardiac period waveforms across all six channels. The potential use of our six-channel system for detecting the physiological sequelae of brain injury was explored in two subjects, one with moderate and one with significant structural brain damage, where the six-point CBF and CBv measurements were referenced to structural magnetic resonance imaging (MRI) scans. Conclusions: We pave the way for a viable multi-point optical instrument for measuring CBF and CBv. Its cost-effectiveness allows for baseline metrics to be established prior to injury in populations at risk for brain injury. © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 International License.

关键词： Noninvasive medical procedures

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Proceedings of SPIE: current developments in Lens design and optical engineering Iv

Proceedings of SPIE: Current Developments in Lens Design and...

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current developments in Lens design and optical engineering Iv

The proceedings contains 15 papers from the Proceedings of SPIE: current developments in Lens design and optical engineering Iv. Topics discussed include: Zernike polynomials and aberration balancing;optical design for imaging spectroscopy;integral optical system design of injection molded optics;structured design method for automotive lamp reflectors;optical systems for free-space laser communications;and current status and future direction of sensors in Earth observing satellites.

关键词： optical systems

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Proceedings of SPIE: current developments in Lens design and optical engineering III

Proceedings of SPIE: Current Developments in Lens Design and...

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current developments in Lens design and optical engineering III

This volume 4767 of the conference proceedings contains 19 papers. Topics discussed include optical system, optical sensors, optical materials, optical design and optical devices.

关键词： optical engineering

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current developments in optical design and optical engineering II

Current Developments in Optical Design and Optical Engineeri...

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current developments in optical design and optical engineering II

Proceedings incorporates 43 papers. These are arranged into six sessions dealing with the following major topics: assembly methods and materials for optical systems;advanced optical manufacturing and testing;optical d... 详细信息

ISBN: (纸本)0819409251

关键词： optical systems

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optically-Controlled 3.3 kv SiC MOSFET with Fast Switching Speed and Low optical Power

Optically-Controlled 3.3 kV SiC MOSFET with Fast Switching S...

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Annual IEEE Conference on Applied Power Electronics Conference and Exposition (APEC)

作者： Xin Yang Guannan Shi Liyang Jin Yuan Qin Matthew Porter Che-Wei Chang Xiaoting Jia Dong Dong Linbo Shao Yuhao Zhang Center for Power Electronics Systems (CPES) Virginia Tech Blacksburg USA Bradley Department of Electrical and Computer Engineering Virginia Tech Blacksburg USA Department of Electrical and Electronic Engineering The University of Hong Kong Hong Kong China

ISBN: (数字)9798331516116

ISBN: (纸本)9798331516123

optically-controlled high-voltage power devices hold good promise for grid and renewable energy applications by providing superior electromagnetic interference (EMI) immunity and reduced switching delay. This paper proposed a novel optically-controlled gate driver architecture that applies complementary optical signals to two photodiodes (PDs) arranged in a totem-pole configuration. This configuration enables fast switching of power semiconductor devices using minimal optical power, as only low-power driver signals are optically modulated and device main current is not photogenerated. To validate this approach, we employ two InGaAs PDs to drive a 3.3 kv SiC MOSFET, the highest-voltage industrial unipolar device currently available. When each PD is illuminated by 21.7 mW optical power, the SiC MOSFET achieves hard-switching at 1500v/3A, with rise and fall times of 152 ns and 214 ns, respectively. These results set new records for switching voltage, speed, and power capacity-to-optical power ratio in optically-controlled unipolar power switches. This general optical driver design is also applicable to the future development of integrated optics for power electronics in diverse (ultra-) wide-bandgap semiconductors. 1

关键词： Integrated optics MOSFET optical design Silicon carbide optical switches optical recording optical materials Ultrafast optics optical modulation optical devices

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Surface and subsurface characteristics of wire-electrical discharge machined Al-alloy and composite: a fundamental study on the role of machining variables

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Journal of Materials Research and Technology 2025年 36卷 9432-9461页

作者： Gaurav Anand Santanu Sardar Satesh Sah Ashim Guha Ibrahim Albaijan Debdulal Das Department of Mechanical Engineering Indian Institute of Engineering Science and Technology Shibpur Howrah 711103 West Bengal India Department of Metallurgy and Materials Engineering Indian Institute of Engineering Science and Technology Shibpur Howrah 711103 West Bengal India Department of Mechanical Engineering College of Engineering in Al-Kharj Prince Sattam Bin Abdulaziz University PO Box 655 Al-Kharj 16273 Saudi Arabia

For hard-to-machine materials like discontinuous particulate reinforced Al-matrix composites, wire-electrical discharge machining (wire-EDM) is increasingly preferred for manufacturing intricately shaped parts with high dimensional accuracies and surface finishes. The wire-EDM process involves a large number of machining variables apart from parameters associated with the workpiece, dielectric, and electrode; therefore, research on wire-EDM is often performed on the basis of the design of experiments , which is somewhat limited the fundamental understanding of the role of various influencing variables. The current experimental research reports the influences of major wire-EDM machining variables on the surface and subsurface characteristics of 20 vol% in-situ Al 3 Fe reinforced Al–2Mg alloy in reference to the unreinforced matrix alloy. The cutting velocity (Cv), kerf width (KW), surface roughness (SR), and surface chemistry (SC, = ΣO + Zn + Cu) of the composite and base alloy have been determined over a wide range of peak current (I P , 70–150 A), pulse-on time (T ON , 5–25 μs), pulse-off time (T OFF , 51–63 μs), servo voltage (S v , 40–80 v), wire feed rate (W FR , 6–10 m min −1 ) and wire tension (WT, 4–12 N), varying one parameter at a time and keeping all others constant at their mid-levels. The surface and subsurface of the wire-EDMed composite and alloy specimens have been extensively characterized employing FESEM coupled with EDS microanalyses, including the change in surface chemistry due to the in-situ oxidation and transfer of elements from the brass wire electrode, while a noncontact optical profilometer has been employed to determine the surface roughness. The Cv, KW, and SR are found to increase monotonically with increasing I P and T ON but decreasing T OFF, while the reverse trend has been observed for SC; these influences are more pronounced for base alloy over composite except for SR. Higher S v diminishes Cv and markedly raises SC; in contrast, en

关键词： Composite WEDM Machining performance Surface integrity Surface chemistry Surface roughness

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