检索结果-内蒙古大学图书馆

International Optical Design Conference, IODC 2021

作者： Schreiber, Peter Wilhelm, Leo M. Fraunhofer Institute for Applied Optics and Precision Engineering IOF Albert-Einstein-Str. 7 Jena07745 Germany

Farfield beam shaping e.g. with diffusers often enlarges etendue. We discuss etendue conserving, high transmission beam shaping with irregular flýs eye condensers. Examples of automotive LED headlamp demonstrator... 详细信息

ISBN: (纸本)9781943580880

关键词： Headlights

来源：评论

学校读者我要写书评

暂无评论

Structured Illumination EUV Imaging

Structured Illumination EUV Imaging

引用

Computational Optical Sensing and Imaging, COSI 2024 - Part of Optica Imaging Congress

作者： Licht, L. Eschen, W. Liu, C. Penagos Molina, D.S. Steinert, M. Siefke, T. Pertsch, T. Limpert, J. Rothhardt, J. Helmholtz Institute Jena Fröbelstieg 3 Jena07743 Germany GSI Helmholtzzentrum für Schwerionenforschung Planckstraße 1 Darmstadt64291 Germany Institute of Applied Physics Abbe Center of Photonics Friedrich-Schiller-University Jena Albert-Einstein-Straße 15 Jena07745 Germany Fraunhofer Institute for Applied Optics and Precision Engineering IOF Albert-Einstein-Str. 7 Jena07745 Germany

We present table-top EUV imaging at 13.5 nm. Using an EUV phase diffusor for generating a highly structured illumination, improves the image quality and resolution in ptychography and opens new avenues for single-shot...

关键词：

来源：评论

学校读者我要写书评

暂无评论

Quantum imaging with undetected photons

Quantum imaging with undetected photons

引用

International Conference on Transparent Optical Networks

作者： F. Krajinic J.R. Leon-Tores M. Kumar C. Helgert F. Setzpfandt B. Jelenkovic Institute of Physics University of Belgrade Pregrevica 118 Belgrade Serbia Fraunhofer Institute of Applied Optics and Precision Engineering IOF Albert-Einstein-Straße 7 Jena Germany

ISBN: (数字)9798350377323

ISBN: (纸本)9798350377330

We present principles of quantum imaging with undetected photons (QIUP) and show modifications we made to the nonlinear interferometer for QUIP in order to use off-axes holography for faster image reconstruction. We present images made by off-axes quantum holography (OAQH) and discuss image capabilities of the system. In this work we use a pair of quantum correlated photons, generated by spontaneous parametric down-conversion in a non-linear crystal; one photon form a pair interacts with object, and another is detected. In our system both photons are in near infra-red, but by slight modifications they will be in different spectral regions, interacting photons in mid infra-red, detected photons in visible or near infra-ed. This opens very useful applications of QIUP for imaging and sensing in MIR.

关键词： Spectroscopy Optical diffraction Imaging Phase shifting interferometry Crystals Phonons Holography

来源：评论

学校读者我要写书评

暂无评论

3D geometric features based real-time American sign language recognition using PointNet and MLP with MediaPipe hand skeleton detection

引用

Measurement: Sensors 2025年 38卷

作者： Zhang, Yan Notni, Gunther Group for Quality Assurance and Industrial Image Processing Technische Universität Ilmenau Ilmenau Germany Fraunhofer Institute for Applied Optics and Precision Engineering IOF Jena Jena Germany

This paper presents a robust and fast hand gesture recognition method. Utilizing the 21 hand key points predicted by MediaPipe developed by Google, we calculate additional 3D geometric features, including the angles of each finger joint. These geometric features are then subjected to deeper feature extraction using a Multilayer Perceptron (MLP). Simultaneously, these hand key points are normalized in 3D spatial space, and the finger and palm regions are interpolated to generate a point cloud representing the hand skeleton. Subsequently, PointNet is employed for feature extraction from this point cloud. The features extracted by MLP and PointNet are fused, and a classifier is employed to output the probability distribution of hand gestures for each frame of a 3D video stream. Furthermore, a probability machine is designed to analyze the probability sequence, providing the overall gesture prediction. In the experimental phase, we trained a model to classify American Sign Language (English letters and numbers 0 to 9). The results demonstrate an overall accuracy of 99.81 %. The entire method operates in less than 10 milliseconds (using an NVIDIA 2080Ti graphics card), showcasing its real-time detection capabilities. © 2024

关键词： Human robot interaction

来源：评论

学校读者我要写书评

暂无评论

Unlocking Diagnostic Potentials: Polarization-Entangled Photon Scattering in Tissue-Mimicking Phantoms

Unlocking Diagnostic Potentials: Polarization-Entangled Phot...

引用

Quantum Sensing and Metrology, QSM 2024 - Part of Optica Sensing Congress

作者： Besaga, Vira R. Lopushenko, Ivan Sieryi, Oleksii Bykov, Alexander Setzpfandt, Frank Meglinski, Igor Institute of Applied Physics Abbe Center of Photonics Friedrich Schiller University Jena Jena07745 Germany Opto-Electronics and Measurement Techniques University of Oulu P.O. Box 4500 OuluFI90014 Finland Fraunhofer Institute for Applied Optics and Precision Engineering IOF Jena07745 Germany College of Engineering and Physical Sciences Aston University BirminghamB4 7ET United Kingdom

We perform comprehensive experimental studies of the behavior of polarization entangled photon pairs when probing realistic samples using tissue-mimicking phantoms and show the applicability of polarization-entangled ... 详细信息

ISBN: (纸本)9781957171364

关键词： Polarization

来源：评论

学校读者我要写书评

暂无评论

Experimental Classification of Samples with Few Coincidence Measurements Using Polarization-Entangled Photon Pairs

Experimental Classification of Samples with Few Coincidence ...

引用

2023 Conference on Lasers and Electro-optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2023

作者： Besaga, Vira R. Zhang, Luosha Vega, Andres Chauhan, Purujit Singh Pertsch, Thomas Sukhorukov, Andrey Setzpfandt, Frank Institute of Applied Physics Abbe Center of Photonics Friedrich Schiller University Jena Albert-Einstein-Str. 6 Jena07745 Germany Fraunhofer Institute for Applied Optics and Precision Engineering IOF Albert-Einstein-Str. 7 Jena07745 Germany Department of Electronic Materials Engineering Research School of Physics The Australian National University CanberraACT2601 Australia

ISBN: (纸本)9798350345995

Probing the polarization response of an object with the well-acknowledged technique of optical polarimetry enables determination of the specimen's inner properties. Prominent examples include the measurement of the chirality of proteins and molecules [1] or the induced anisotropy of disease-affected cells and tissues [2]. Aiming for better signal-to-noise ratio, lower photon flux of the probing beam and non-local diagnostics, polarimetric approaches employing the quantum nature of light and entanglement are currently rapidly developing [3-6]. In the present work we study the experimental feasibility of the non-local identification of different polarizing samples by performing only few coincidence measurements [6] without necessity for full density matrix reconstruction of the quantum state. © 2023 IEEE.

关键词： Diagnosis

来源：评论

学校读者我要写书评

暂无评论

Light scattering from diffraction gratings

Light scattering from diffraction gratings

引用

2022 International Conference on Space optics, ICSO 2022

作者： Heusinger, Martin Trost, Marcus Steinkopf, Ralf Kohlhaas, Ralf Tomuta, Dana Windpassinger, Roman Risse, Stefan Zeitner, Uwe Fraunhofer Institute for Applied Optics and Precision Engineering IOF Albert-Einstein-Straße 7 JenaD-07745 Germany SRON Netherlands Institute for Space Research Sorbonnelaan 2 Utrecht3584 CA Netherlands European Space Research and Technology Centre Postbus 299 Noordwijk2200 AG Netherlands

ISBN: (纸本)9781510668034

In this contribution we will present different methods for analyzing straylight measurements in spectrometer gratings. For this purpose two different but very common types of gratings are investigated: a binary high resolution littrow grating and a silicon-crystel echelle reflection grating. We will present several measurements and simulations on such gratings. The focus lies in particular on the difference between grating ghosts and homogeneous scattering background. It is worked out, that the homogenous background must be evaluated by the well-established concept of"angle resolved scattering". Though, it is advantegeous to use the concept of"angle resolve efficiency" for ghost analysis. Further, a simulation method is presented that allows to calculate straylight in diffraction gratings. The method is applied for ghost and background analysis and it is shown that not only the particular type of disturbance but also the grating geometry itself affects the straylight level and distribution. © 2023 SPIE. All rights reserved.

关键词： Light scattering

来源：评论

学校读者我要写书评

暂无评论

Entangled two-photon absorption in commercial fluorophores

Entangled two-photon absorption in commercial fluorophores

引用

CLEO: Science and Innovations, CLEO:S and I 2021 - Part of Conference on Lasers and Electro-optics, CLEO 2021

作者： Gäbler, Tobias B. Jain, Nitish León Torres, Josue R. Hendra, Patrick Gräfe, Markus Fraunhofer Institute of Applied Optics and Precision Engineering IOF Albert-Einstein-Straße 7 JenaD-07745 Germany

Our study addresses the applicability of simple and common fluorophores for entangled two-photon fluorescence microscopy. Using CW-pumped SPDC waveguides, we can measure linear absorption rates of entangled photons in... 详细信息

ISBN: (纸本)9781557528209

关键词： Fluorophores

来源：评论

学校读者我要写书评

暂无评论

Through-Silicon Ultrafast Laser Welding

Through-Silicon Ultrafast Laser Welding

引用

Conference on Lasers and Electro-optics Europe (CLEO EUROPE)

作者： Maxime Chambonneau Qingfeng Li Markus Blothe Stefan Nolte Friedrich Schiller University Jena Institute of Applied Physics Abbe Center of Photonics Jena Germany Fraunhofer Institute for Applied Optics and Precision Engineering IOF Jena Germany

ISBN: (纸本)9798350345995

Joining workpieces is an essential step in numerous industrial applications. In contrast to many traditional methods, ultrafast laser welding offers the possibility to join workpieces in a fast, clean and contactless way. This method relies on the propagation of ultrashort pulses in a first workpiece, and energy deposition at the interface with a second workpiece. While it can be employed in configurations where the first workpiece is a dielectric material, it cannot be straightforwardly applied for a first workpiece made out of silicon (e.g., silicon-metal, silicon-silicon). This originates from nonlinear propagation effects which dramatically diminish the energy deposition at the interface [1–4]. Among these effects related to filamentation which cause strongly delocalized energy deposition, one must cite phenomena such as intensity clamping and nonlinear focal shift.

关键词： Nonlinear effects Picosecond pulses Pulse propagation Silicon Ultrafast lasers Ultrashort pulses

来源：评论

学校读者我要写书评

暂无评论

High-dimensional quantum fingerprinting

High-dimensional quantum fingerprinting

引用

Optica Quantum 2.0 Conference and Exhibition, Quantum 2.0

作者： Cabrejo-Ponce, Meritxell Chen, Yuanyuan Chen, Lixiang Steinlechner, Fabian Fraunhofer Institute for Applied Optics and Precision Engineering IOF Albert-Einstein-Strasse 7 Jena07745 Germany Department of Physics Xiamen University Xiamen361005 China Friedrich Schiller University Jena Abbe Center of Photonics Albert-Einstein-Str. 6 Jena07745 Germany

We propose a novel way to generate and distribute broadband photons and thus high-dimensional frequency-path entangled states, ideal for protocols such as quantum fingerprinting. For this purpose, the HOM interference... 详细信息

ISBN: (纸本)9781957171272

关键词： Beam splitters Fourier transforms Interference Modes Phase Quantum teleportation

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：