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

作者： Luis J. Gonzalez-Martin Del Campo Nicolás Tangarife Sakshi Sharma Christopher Spiess René Sondenheimer Fabian Steinlechner Fraunhofer Institute for Applied Optics and Precision Engineering Jena Germany Friedrich Schiller University Jena Abbe Center of Photonics Jena Germany

ISBN: (纸本)9798350345995

In this work we demonstrate experimentally the realization and characterization of high-dimensional hyperentangled quantum states of light in the time-energy and polarization degree of freedom. For this goal we use an ultra-bright Sagnac-type source to generate entangled photon in the telecommunication band by means of spontaneous parametric down-conversion (SPDC). To project the time-energy entanglement to a 4-dimensional space we implemented a 4-arm interferometer, consisting of a cascade array of 2-arm unbalanced Mach-Zehnder interferometers (UMZI). For the case of the projection of the entangled quantum states in the polarization degree of freedom (DoF) a compact, stable and robust polarization analysis module (PAM) was implemented to project polarization correlations in two non-orthogonal basis.

关键词： Interferometers Parametric down conversion Photon polarization Photonic entanglement Polarization Quantum cryptography

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Retrieval of Elastic Constants of Liquid Crystals Using Physics-Informed Neural Network

Retrieval of Elastic Constants of Liquid Crystals Using Phys...

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Frontiers in optics, FiO 2022

作者： Jisha, Chandroth P. Alberucci, Alessandro Nolte, Stefan Friedrich Schiller University Jena Institute of Applied Physics Abbe Center of Photonics Albert-Einstein-Str. 15 Jena07745 Germany Fraunhofer Institute for Applied Optics and Precision Engineering Albert-Einstein-Straße 7 Jena07745 Germany

ISBN: (纸本)9781557528209

关键词： Elastic constants

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Properties of Waveguides Based Upon the Pancharatnam-Berry Phase

Properties of Waveguides Based Upon the Pancharatnam-Berry P...

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Frontiers in optics, FiO 2022

作者： Arumugam, Stree Vithya Jisha, Chandroth P. Alberucci, Alessandro Nolte, Stefan Friedrich Schiller University Jena Institute of Applied Physics Abbe Center of Photonics Albert-Einstein-Straße 15 Jena07745 Germany Fraunhofer Institute for Applied Optics and Precision Engineering Albert-Einstein-Straße 7 Jena07745 Germany

A waveguide based upon the Pancharatnam-Berry phase (PBP) confines light even in the absence of a refractive index gradient. Here, we investigate theoretically the properties and the robustness of the PBP waveguide. &... 详细信息

ISBN: (纸本)9781557528209

关键词： Waveguides

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High-gain Spontaneous Parametric Down-conversion in Dispersive and Absorbing Nanostructured Systems

High-gain Spontaneous Parametric Down-conversion in Dispersi...

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Bragg Gratings, Photosensitivity and Poling in Glass Waveguides and Materials, BGPP 2022

作者： Krstić, Aleksa Setzpfandt, Frank Pertsch, Thomas Saravi, Sina Institute of Applied Physics Abbe Center of Photonics Friedrich-Schiller University Jena Albert-Einstein-Str. 15 Jena07745 Germany Fraunhofer Institute for Applied Optics and Precision Engineering Albert-Einstein-Str. 7 Jena07745 Germany

We develop a non-perturbative description of spontaneous parametric downconversion in the high-gain regime for nanostructured systems with arbitrary amount of loss and dispersion, and use it numerically to investigate...

ISBN: (纸本)9781957171166

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Time-domain analysis of mode competition in ZnO nanowire lasers in inhomogeneous environments

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Optical and Quantum Electronics 2025年第2期57卷 1-17页

作者： Repp, Daniel Barreda, Angela Vitale, Francesco Staude, Isabelle Peschel, Ulf Ronning, Carsten Pertsch, Thomas Institute of Applied Physics Friedrich Schiller University Jena Albert Einstein Straße 15 Thuringia Jena07745 Germany Group of Displays and Photonics Applications Carlos III University of Madrid Avda. de la Universidad 30 Madrid Leganés Madrid28911 Spain Institute of Solid State Physics Friedrich Schiller University Jena Max Wien Platz 1 Thuringia Jena07743 Germany Institute of Condensed Matter Theory and Solid State Optics Friedrich Schiller University Jena Max Wien Platz 1 Thuringia Jena07743 Germany Fraunhofer Institute for Applied Optics and Precision Engineering Friedrich Schiller University Jena Albert Einstein Straße 7 Thuringia Jena07745 Germany

Zinc oxide (ZnO) nanowire lasers are increasingly integrated into complex optoelectronic devices as a source of coherent radiation. To enable the rational design of these devices, it is crucial to understand how both the nanowire resonator and its surrounding environment influence mode competition and the three-dimensional structure of lasing modes. Additionally, realistic models of the lasing process must account for transient gain dynamics. In order to investigate the impact of an inhomogeneous environment, composed of various materials and structures, on mode competition, we conducted Finite-Difference Time-Domain (FDTD) simulations of the dominant lasing modes in different ZnO nanowire laser configurations. Our model describes how key parameters such as nanowire diameter, length, and substrate choice affect the field distribution in the lasing regime. We show that metallic substrates support lasing in thin nanowires in two distinct coupling regimes. Furthermore, we show that metallic particles attached to the nanowire end facets as a result of established nanowire growth techniques significantly influence lasing threshold, field distribution and competition between counter-propagating modes. We show that attaching an aluminum particle at the end facet of a ZnO nanowire leads to a threshold reduction, a switching of the dominant lasing mode and a mono-directional power flow inside a large segment of the nanowire. © The Author(s) 2025.

关键词： Nanowires

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Experimental analysis of image resolution of quantum imaging with undetected light through position correlations

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Physical Review A 2023年第5期108卷 052610-052610页

作者： Marta Gilaberte Basset René Sondenheimer Jorge Fuenzalida Andres Vega Sebastian Töpfer Elkin A. Santos Sina Saravi Frank Setzpfandt Fabian Steinlechner Markus Gräfe Fraunhofer Institute for Applied Optics and Precision Engineering IOF Albert-Einstein-Str. 7 07745 Jena Germany Friedrich-Schiller-University Jena Institute of Applied Physics Abbe Center of Photonics Albert-Einstein-Str. 6 07745 Jena Germany Friedrich-Schiller-University Jena Institute of Condensed Matter Theory and Optics Max-Wien-Platz 1 07743 Jena Germany Institute of Applied Physics Technical University of Darmstadt Schloßgartenstraße 7 64289 Darmstadt Germany

Image resolution of quantum imaging with undetected photons is governed by the spatial correlations existing between the photons of a photon pair that has been generated in a nonlinear process. These correlations allow for obtaining an image of an object with light that never interacted with that object. Depending on the imaging configuration, either position or momentum correlations are exploited. We hereby experimentally analyze how the crystal length and pump waist affect the image resolution when using position correlations of photons that have been generated via spontaneous parametric down conversion in a nonlinear interferometer. Our results support existing theoretical models for the dependency of the resolution on the crystal length. In addition, we probe the resolution of our quantum imaging scheme for varying pump waists over one order of magnitude. This analysis reveals the intricate dependency of the resolution on the strength of the correlations within the biphoton states for parameter combinations in which the crystal lengths are much larger than the involved photon wavelengths. We extend the existing models in this parameter regime to properly take nontrivial effects of finite pump waists into account and demonstrate that they match the experimental results.

关键词： Photon pairs & parametric down-conversion Quantum engineering Quantum sensing

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Correlative table-top infrared and EUV ptychography of microorganisms using an integrated setup

Correlative table-top infrared and EUV ptychography of micro...

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2023 Computational Optical Sensing and Imaging, COSI 2023 in Optica Imaging Congress - Part of Imaging and applied optics Congress 2023

作者： Liu, C. Eschen, W. Loetgering, L. Licht, L. Penagos Molina, D.S. Iliou, A. Klas, R. Hillmann, F. 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 Leibniz Institute for Natural Product Research and Infection Biology Adolf-Reichwein-Str. 23 Jena07745 Germany Fraunhofer Institute for Applied Optics and Precision Engineering IOF Albert-Einstein-Str. 7 Jena07745 Germany

We present a novel high-harmonic-based multi-wavelength correlative ptychographic microscope that employs infrared and extreme ultraviolet illumination. Our approach achieves position-correlated sub-60 resolution and ... 详细信息

ISBN: (纸本)9781957171289

关键词： Biomedical imaging Infrared imaging Multimodal imaging Nonlinear frequency conversion Photon counting Ptychography

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High performance optical free-space links for quantum communications

High performance optical free-space links for quantum commun...

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2020 International Conference on Space optics, ICSO 2020

作者： Goy, Matthias Berlich, René Kržič, Andrej Rieländer, Daniel Kopf, Teresa Sharma, Sakshi Steinlechner, Fabian Fraunhofer Institute for Applied Optics and Precision Engineering Jena Germany Abbe Center of Photonics Friedrich Schiller University Jena Germany

Secure communication networks are the critical infrastructure of the information age. To ensure secure communication between governmental institutions and other high-security environments, the German Federal Ministry of Education and Research (BMBF) initiated an ambitious project – the QuNET initiative. In a joint effort, the Max Planck institute for the Science of Light (MPL), the German Aerospace Center (DLR) and the fraunhofer Society aim to develop the technological basis of a German quantum key distribution (QKD) infrastructure. This paper describes the infrastructure used in a first link demonstrator within this project and how we achieved the transition from initial quantum transceiver concepts to first link experiments. © 2021 ESA and CNES

关键词： Quantum communication

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Miniature three-mirror telescope for the thermal infrared

Miniature three-mirror telescope for the thermal infrared

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2022 International Conference on Space optics, ICSO 2022

作者： Peschel, Thomas von Lukowicz, Henrik Zettlitzer, Lucas Hartung, Johannes Risse, Stefan Beier, Matthias Bierdel, Marius Gulde, Max Fraunhofer Institute for Applied Optics and Precision Engineering Albert-Einstein-Strasse 7 JenaD-07745 Germany SPACEOPTIX GmbH Hans-Knöll-Straße 6 JenaD-07745 Germany ConstellR GmbH Ernst-Zermelo-Strasse 4 FreiburgD-79104 Germany

ISBN: (纸本)9781510668034

The current paper describes the optical and mechanical design of a compact Three-Mirror Anastigmate (TMA) telescope which is installed at the ISS as an earth observation demonstrator for the thermal-infrared spectral range. The TMA bases on a Korsch type1, 2 design. It has a focal length of 150 mm and an aperture of F/3 and allows for a diffraction limited performance at the design wavelength of 10 μm. The ground resolution reaches 80 m from the ISS. The mechanical design fits into a design space of 80x80x150 mm3 which would correspond to 1.5 U of a typical CubeSat for the telescope or 3U for the whole instrument, respectively. © 2023 SPIE. All rights reserved.

关键词： Mirrors

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Surface Second Harmonic Generation from AB-Type Stacks of Dielectric Nanolaminates

Surface Second Harmonic Generation from AB-Type Stacks of Di...

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

作者： Fatemeh Abtahi Pallabi Paul Athira Kuppadakkath Anton Pakhomov Adriana Szeghalmi Frank Setzpfandt Falk Eilenberger Abbe Center of Photonics Friedrich Schiller University Jena Institute of Applied Physics Jena Germany Franhofer-Institute for Applied Optics and Precision Engineering IOF Jena Germany Max Plank School of Photonics Jena Germany

ISBN: (纸本)9798350345995

Surface Second Harmonic Generation (SHG) is a second order nonlinear process that can only be observed in materials with broken inversion symmetry. However, due to the discontinuity of the medium and the large electric field gradient at a surfaces, the inversion is broken and SHG can be generated there, too [1]. A. Pakhamov and et al [2] theoretically studied the surface SHG from ultrathin stacks of TiO 2 /SiO 2 . There many surfaces contribute to SHG in a subwavelength arrangement. They have predicted SHG enhancement from superimposing the signals from each surfaces with transfer matrix method.

关键词： Atomic layer deposition Materials Matrix methods Second harmonic generation Surfaces Titanium dioxide

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