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CLEO: Science and Innovations in CLEO 2024, CLEO: S and I 2024 - Part of Conference on Lasers and Electro-Optics

作者： Hoghooghi, Nazanin Chang, Peter Egbert, Scott Burch, Matt Shaik, Rizwan Lynch, Patrick Diddams, Scott Rieker, Gregory B. Time and Frequency Division National Institute of Standards and Technology BoulderCO United States Precision Laser Diagnostics Laboratory University of Colorado Boulder BoulderCO United States Department of Physics University of Colorado Boulder BoulderCO United States Department of Mechanical and Industrial Engineering University of Illinois Chicago ChicagoIL United States Electrical Computer and Energy Engineering Department University of Colorado Boulder BoulderCO United States

We study abundance and temperature of species in reactant to product breakdown of 1,3,5-trioxane inside a shock-tube using a 1 GHz repetition rate mid-infrared dual-comb spectrometer with optical bandwidth > 30 THz... 详细信息

关键词： Infrared spectrometers

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High-Value Target Escort and Defense Scenario with Differential Subgame Cost

High-Value Target Escort and Defense Scenario with Different...

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IEEE Conference on Decision and Control

作者： Rachael L. Judy Zachariah E. Fuchs David W. Casbeer Department of Electrical Engineering and Computer Science University of Cincinnati Cincinnati OH Control Science Center of Excellence Air Force Research Laboratory 2210 8th St. WPAFB OH

ISBN: (数字)9798350316339

ISBN: (纸本)9798350316346

An Escort and Defense Scenario is presented in which a high-value Target maneuvers through a high-risk region while being escorted by a mobile, defensive agent. Along this trajectory, an Attacker may be launched from one of several possible launch locations. If a launch occurs, the three agents play out a Target-Attacker-Defender (TAD) differential game in which the Defender attempts to intercept the Attacker at maximal distance from the Target while the Attacker strives to maneuver as close as possible to the Target. Prior to launch, the Target and Defender strive to preposition themselves in advantageous positions to effectively respond to a potential threat while simultaneously moving towards a safety region. An augmented collocation-based direct optimal control method is developed to solve the escort problem by solving and utilizing the value of the TAD differential subgame at each collocation point while simultaneously optimizing the primary optimal control problem.

关键词： Costs Optimal control Differential games Safety Trajectory

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Study on the single pulse ablation characteristics of SiC ceramics by infrared femtosecond laser 18

Study on the single pulse ablation characteristics of SiC ce...

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18th National Conference on Laser Technology and Optoelectronics 2023

作者： Shen, Shunquan Chen, Xiaoxiao Zhang, Xuanhua Chen, Jianbo Zhang, Wenwu Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Zhejiang Provincial Key Laboratory of Aeroengine Extreme Manufacturing Technology Zhejiang Ningbo315201 China Faculty of Electrical Engineering and Computer Science Ningbo University Zhejiang Ningbo315021 China University of Chinese Academy of Sciences Beijing100049 China JiangXi University of Science and Technology Jiangxi Ganzhou341000 China

ISBN: (纸本)9781510668379

SiC ceramics have excellent physical and chemical properties, and have been extensively researched and used in electronics, optics, semiconductor and other fields. However, due to its high strength, high hardness and other characteristics, the conventional processing of SiC ceramics faces a series of challenges. Laser processing has become an effective processing technology due to its unique advantages. In this paper, the single pulse ablation tests of SiC ceramic with different powers were performed by using infrared femtosecond laser. The single pulse ablation threshold of SiC ceramic was calculated by using equivalent diameter method and equivalent area method, and the influence of laser power on the depth of the ablation hole was discussed. The results show that when the repetition frequency is 25kHz and the wavelength is 1035nm, the laser ablation values calculated by the equivalent diameter method and the equivalent area method are 0.3454 J/cm2 and 0.3268 J/cm2, respectively. Within a certain laser power range or reaching a certain ablation hole depth, the ablation hole depth augments with the increment of laser power. Beyond a specified laser power range, the hole depth decreases with the increment of laser power due to the effect of plasma shielding and recasting layer. © 2023 SPIE.

关键词： Femtosecond lasers

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Improved Radiation Estimation at High Energy Facility for Public Health

Improved Radiation Estimation at High Energy Facility for Pu...

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IEEE Annual Ubiquitous Computing, Electronics & Mobile Communication Conference (UEMCON)

作者： Jerry Cao-Xue Hongfang Zhang Adam Stavola Bence Budavari Chiman Kwan Hongyi Wu Jiang Li William G. Enloe High School Raleigh NC Department of Electrical and Computer Engineering Old Dominion University Norfolk VA Thomas Jefferson National Accelerator Facility Newport News VA Applied Research LLC Rockville MD Force Projection Sector Johs Hopkins University Applied Physics Laboratory Laurel MD Department of Electrical & Computer Engineering University of Arizona Tuscon AZ

ISBN: (数字)9798331540906

ISBN: (纸本)9798331540913

Long-term exposure to ionizing radiation can lead to the development of cancer and other potentially fatal diseases. Estimating radiation levels at high-energy particle accelerators is crucial for ensuring the safety of personnel, the public, and the environment. This paper explores the application of transformer neural networks, focusing on five different attention mechanisms—Full Attention, Prob Attention, AutoCorrelation, Fourier Attention, and Wavelet Attention—for estimating radiation levels at the Thomas Jefferson National Accelerator Facility (JLab). The goal is to improve the accuracy of radiation estimation by training models using data from key radiation sensors. Four hundred trials were conducted for each attention mechanism, and performance was evaluated using metrics including R 2 . The results demonstrated that Prob Attention and AutoCorrelation outperformed the other mechanisms, offering substantial improvements over previous models. These findings highlight the importance of selecting and fine-tuning attention mechanisms in transformers for complex time-series analysis tasks in radiation monitoring.

关键词： Wavelet transforms Training Radiation monitoring Attention mechanisms Time series analysis Estimation Transformers Sensors Safety Autocorrelation

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All-silicon quantum light source by embedding an artificial atom in a nanophotonic cavity

All-silicon quantum light source by embedding an artificial ...

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Frontiers in Optics + Laser Science 2023, FiO, LS 203: Part of Frontiers in Optics + Laser Science 2023

作者： Zhiyenbayev, Yertay Redjem, Walid Qarony, Wayesh Ivanov, Vsevolod Papapanos, Christos Liu, Wei Jhuria, Kaushalya Al Balushi, Zakaria Dhuey, Scott Schwartzberg, Adam Tan, Liang Z. Schenkel, Thomas Kanté, Boubacar Department of Electrical Engineering and Computer Sciences University of California Berkeley BerkeleyCA94720 United States Accelerator Technology and Applied Physics Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Department of Materials Science and Engineering University of California Berkeley BerkeleyCA94720 United States Materials Sciences Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Molecular Foundry Lawrence Berkeley National Laboratory BerkeleyCA94720 United States

We demonstrate the first all-silicon quantum light source, by embedding a single silicon-based defect within a silicon nanophotonic cavity, resulting in a 30-fold enhancement of luminescence and an 8-fold acceleration... 详细信息

ISBN: (纸本)9781957171296

关键词： Electron beam lithography Photonic crystal cavities Photonic crystals Quantum light sources Ring resonators Scanning electron microscopy

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Flame spray pyrolysis for the one-step fabrication of transition metal oxide films:Recent progress in electrochemical and photoelectrochemical water splitting

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Chinese Chemical Letters 2020年第3期31卷 601-604页

作者： Hongjun Chen Hemant Kumar Mulmudi Antonio Tricoli Nanotechnology Research Laboratory Research School of ElectricalEnergy and Materials EngineeringCollege of Engineering and Computer ScienceAustralian National UniversityCanberra 2601Australia

Developing large scale deposition techniques to fabricate thin porous films with suitable opto-electro nic properties for water catalysis is a necessity to mitigate climate change and have a sustainable *** this review,flame spray pyrolysis(FSP)technique,a rapid and scalable methodology to synthesize nanostructured transitional metal oxide films with designed functionalities,is firstly ***,applications in electrochemical(EC)and photoelectrochemical(PEC)water splitting for the production of hydrogen fuel is also *** high combustion temperature and the aggregation of flame aerosol ensure that the FSP-made films possess high crystallinity,tunable porosity and high surface areas,making this method suitable either as catalysts for EC water splitting or as efficient semiconductor materials for PEC water ***,a perspective on the next generation FSP engineered films with potential applications in energy storage and conversion is described.

关键词： Scalable One-step Flame-spray pyrolysis Transition metal oxide Electrochemical Photoelectrochemical Water splitting

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Femtosecond Laser based Post-Processing Free True Random Number Generator

Femtosecond Laser based Post-Processing Free True Random Num...

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Frontiers in Optics + Laser Science 2023, FiO, LS 203: Part of Frontiers in Optics + Laser Science 2023

作者： Sharma, Amritash Paithankar, Prasanna Varshney, Shailendra K. Group Advanced Photonics Laboratory Department of Electronics and Electrical Communication Engineering Indian Institute of Technology West Bengal Kharagpur721302 India Department of Applied Optics and Photonics University of Calcutta Technology Campus JD 2 Salt Lake Kolkata700098 India Department of Computer Science and Engineering Indian Institute of Technology West Bengal Kharagpur721302 India Authors contributed equally

We experimentally demonstrate a high-entropy source based on the intensity fluctuation in a femtosecond laser. The setup successfully passes statistical tests without any post-processing. The generator can be potentia... 详细信息

ISBN: (纸本)9781957171296

关键词： Femtosecond lasers Laser sources Mode-locked fiber lasers Quantum communications Quantum cryptography Ultrafast lasers

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A New Compact Cantor Set Fractal MIMO Antenna for 5G Millimeter-Wave Applications

A New Compact Cantor Set Fractal MIMO Antenna for 5G Millime...

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Microwave and Antenna Symposium (IMAS), International

作者： Omaima Benkhadda Abdelati Reha Mohamed Saih Meryama Harrou Laboratory of Mathematics Computer Science Electrical Engineering and Physics (LAMIGEP) EMSI-Marrakech Marrakech Morocco Team of Microelectronics Embedded Systems and Telecommunication FST Sultan Moulay Slimane University Beni Mellal Morocco

ISBN: (数字)9798350356359

ISBN: (纸本)9798350356366

This article outlines the development of a compact MIMO antenna with two ports crafted for millimeter-wave band operations, specifically tailored to support fifth-generation (5G) wireless applications. The suggested antenna is constructed on a Rogers RT/duroid 5880 substrate, measuring ${12} \times {6}\times {0.508} \text{mm}{3}$ . The proposed antenna has a slotted ground on the bottom and two Fractal-shaped radiating elements inspired by the Cantor Set pattern, positioned atop the dielectric material. The suggested antenna covers the millimeter-wave spectrum utilized in 5G, showcasing a wide bandwidth extending from 26.6 GHz to 29.08 GHz and 38.5 to 39.2 GHz. The antenna attains a maximum gain of 7.64 dBi, robust isolation exceeding 26 dB and demonstrates exceptional diversity performance, with an envelope correlation coefficient (ECC) below 0.003 and a diversity gain (DG) surpassing 10 dB. The obtained results Confirm the validity of the designed MIMO antenna's robustness and make it a viable option for 5G wireless equipment.

关键词： Microwave antennas Wireless communication Correlation coefficient Antenna measurements Slot antennas 5G mobile communication Millimeter wave measurements Bandwidth Fractals Substrates

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Quantum Correlations in Multimode Nonlinear Optics

Quantum Correlations in Multimode Nonlinear Optics

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Conference on Lasers and Electro-Optics (CLEO)

作者： Shiekh Zia Uddin Jamison Sloan Nicholas Rivera Sahil Pontula Yannick Salamin Michael Birk Pavel Sidorenko Ido Kaminer Marin Soljačić Department of Physics Massachusetts Institute of Technology Cambridge MA USA Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge MA USA Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge MA USA Department of Physics Harvard University Cambridge MA USA Department of Electrical and Computer Engineering and Solid State Institute Technion - Israel Institute of Technology Haifa Israel

We develop a framework describing quantum noise propagation in highly spatially multimode nonlinear optical systems. We predict quantum deviations of the spatial intensity noise distribution from the spatial power dis... 详细信息

ISBN: (纸本)9798350369311

关键词： Correlation Laser noise Optical propagation Power distribution Electro-optic effects Optical noise Nonlinear optics

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An End-to-End Human Simulator for Task-Oriented Multimodal Human-Robot Collaboration

arXiv

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arXiv 2023年

作者： Shervedani, Afagh Mehri Li, Siyu Monaikul, Natawut Abbasi, Bahareh Di Eugenio, Barbara Žefran, Miloš The Robotics Laboratory Department of Electrical and Computer Engineering University of Illinois Chicago ChicagoIL60607 United States The Natural Language Processing Laboratory Department of Computer Science University of Illinois Chicago ChicagoIL60607 United States The Computer Science Department California State University Channel Islands CamarilloCA93012 United States

This paper proposes a neural network-based user simulator that can provide a multimodal interactive environment for training Reinforcement Learning (RL) agents in collaborative tasks involving multiple modes of communication. The simulator is trained on the existing ELDERLY-AT-HOME corpus and accommodates multiple modalities such as language, pointing gestures, and haptic-ostensive actions. The paper also presents a novel multimodal data augmentation approach, which addresses the challenge of using a limited dataset due to the expensive and time-consuming nature of collecting human demonstrations. Overall, the study highlights the potential for using RL and multimodal user simulators in developing and improving domestic assistive robots. Copyright © 2023, The Authors. All rights reserved.

关键词： Reinforcement learning

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