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检索条件"机构=Franhofer-Institute for Applied Optics and Precision Engineering IOF"

共 513 条记录，以下是31-40 订阅

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Stabilization of fiber-based interferometer with single photons

Stabilization of fiber-based interferometer with single phot...

引用

2023 Conference on Lasers and Electro-optics, CLEO 2023

作者： Spiess, Christopher Del Campo, Luis Javier González Martin Villamizar, Nicolas Eduardo Tangarife Steinlechner, Fabian Fraunhofer Institute for Applied Optics and Precision Engineering IOF Albert-Einstein-Strasse 7 Jena07745 Germany Friedrich Schiller University Jena Fürstengraben 1 Jena07743 Germany

ISBN: (纸本)9781957171258

Stabilizing fiber-based interferometers is a challenge. Here we show a visibility of 0.96 ±0.03 (phase resolution σλ = 0.012λ) by only single-photon processing with fiber phase variations of 230◦/s. Applications range from coherent optical communication to advanced quantum communication protocols. © Optica Publishing Group 2023.

关键词： Photons

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Multiplexed Quantum Secret Sharing via subspace encoding

Multiplexed Quantum Secret Sharing via subspace encoding

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Quantum 2.0, QUANTUM 2024 in Quantum 2.0 Conference and Exhibition

作者： Cabrejo-Ponce, Meritxell Spiess, Christopher Sevilla, Carlos Steinlechner, Fabian Fraunhofer Institute for Applied Optics and Precision Engineering IOF Albert-Einstein-Strasse 7 Jena07745 Germany Friedrich Schiller University Jena Abbe Center of Photonics Albert-Einstein-Str. 6 Jena07745 Germany

By manipulating the spectral phase of polarization-entangled photons, we show a subspace encoding method that enables Quantum Secret Sharing to be deployed in multiplexed and reconfigurable networks. © 2024 The A... 详细信息

ISBN: (纸本)9781557525185

关键词： Encoding (symbols)

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Evaluation of Internal and External Starch Changes in Apples Using Hyper-Spectral Analyses in the NIR-SWIR 14

Evaluation of Internal and External Starch Changes in Apples...

引用

14th Workshop on Hyperspectral Imaging and Signal Processing: Evolution in Remote Sensing, WHISPERS 2024

作者： Perez, A. K. Ruvalcaba Siess, G. Janunts, N. Boehm, V. Tuennermann, A. Institute of Applied Physics Friedrich Schiller University Abbe Center of Photonics Jena07745 Germany Ams OSRAM Group Jena07745 Germany Institute of Nutritional Sciences Friedrich Schiller University Jena07743 Germany Fraunhofer Institute for Applied Optics and Precision Engineering IOF Jena07745 Germany

ISBN: (纸本)9798331513139

Starch Pattern Index (SPI) is one of the most common parameters used to determine the degree of ripeness of fruits. To predict the degree of ripeness, SPI is combined with chemometric analysis. Nevertheless, the spectral correlation between external and internal starch changes has not been evaluated. This study evaluates the internal and external changes of starch in Gala apples during the 2024 season by covering the near-infrared (NIR) and short-wave infrared (SWIR) spectral ranges from 700nm to 2300nm. The evaluation consisted of a multispectral NIR-SWIR camera analysis and spectral measurements along the surface. Results revealed a pattern on the apple cortex similar to SPI without the use of iodine implementation of a false negative RGB image. Furthermore, the different SPIs were also distinguished by the spectral measurements along the surface, allowing a correlation in both instances with the same phenomenon. © 2024 IEEE.

关键词： Hyper-spectral analysis Post-Harvesting Spectral sensors Starch pattern index Sustainability

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Spatiotemporal Description of Non-linear Interference Based on Cascaded Spontaneous Parametric Down-Conversion

Spatiotemporal Description of Non-linear Interference Based ...

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Quantum 2.0, QUANTUM 2024 in Quantum 2.0 Conference and Exhibition

作者： Sevilla-Gutiérrez, Carlos Chauhan, Purujit Steinlechner, Fabian Fraunhofer Institute for Applied Optics and Precision Engineering IOF Albert-Einstein-Strasse 7 Jena07745 Germany Abbe Center of Photonics Friedrich-Schiller-University Jena Albert-Einstein-Str. 6 Jena07745 Germany

We model and experimentally demonstrate the full spatiospectral non-linear interference of cascaded SPDC sources using a spectrally dependent Laguerre-Gaussian basis and an arbitrary mode dependent transformation perf... 详细信息

ISBN: (纸本)9781557525185

关键词： Optical systems

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Robust Time Transfer with Single Photons on Hybrid Quantum Communication Scenarios in Fiber and Free-Space

Robust Time Transfer with Single Photons on Hybrid Quantum C...

引用

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

作者： Spiess, Christopher Paciorek, Karolina Döll, Nico Lennart Kržič, Andrej Steinlechner, Fabian Friedrich Schiller University Jena Fürstengraben 1 Jena07743 Germany Fraunhofer Institute for Applied Optics and Precision Engineering IOF Albert-Einstein-Strasse 7 Jena07745 Germany

ISBN: (纸本)9798350345995

Quantum communication networks exploit single photons to generate secure encryption keys and can have very tight timing requirements [1]. These synchronization requirements are met through highly stable references, but there is ongoing research on using only single photons to enable synchronization [2-4]. The single photons come naturally with the quantum communication protocol and motivate its use for both data and time transfer. As point-to-point quantum communication scenarios rapidly expand to large networks, there is great demand for robust and resource-saving synchronization methods. In this contribution, we show that single photons can be indeed a solid carrier of timing information. We complement other publications [2,5] by describing the performance of the synchronization approach and evaluating it on a 1.7 km free space and a 70 km deployed intercity fiber link. We demonstrate time deviations of 100 ps (1.7 km free-space link) and 174 ps (70 km fiber-link) at integration times of 1 second with only crystal oscillators, which is slightly larger than 54 ps in a lab environment (Fig. 1(a)). Our results provide advances towards a strong, independent, and secure quantum communication network without external hardware and a reliable operation under versatile link scenarios. © 2023 IEEE.

关键词： Quantum communication

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Optimization of Entangled Two-Photon Absorption Experiments based on Semi-Empirical Approach with Accessible Chemical Properties of Fluorescence Dyes

Optimization of Entangled Two-Photon Absorption Experiments ...

引用

Quantum 2.0, QUANTUM 2024 in Quantum 2.0 Conference and Exhibition

作者： Gäbler, Tobias B. Krstić, Aleksa Jain, Nitish Gili, Valerio F. Saravi, Sina Setzpfandt, Frank Gräfe, Markus Institute of Applied Physics Friedrich-Schiller University Jena Albert-Einstein-Straße 15 Jena07745 Germany Fraunhofer Institute for Applied Optics and Precision Engineering IOF Albert-Einstein-Straße 7 Jena07745 Germany Institute of Applied Physics Technical University of Darmstadt Schloßgartenstraße 7 Darmstadt64289 Germany

Studies on entangled two-photon absorption often do not show proof of fluorescence emission. Also, theoretical predictions for specific dyes are missing. We introduce a semi-empirical approach based on accessible chem... 详细信息

ISBN: (纸本)9781557525185

关键词： Quantum entanglement

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Concept and realisation of a modular alignment turning machine 23

Concept and realisation of a modular alignment turning machi...

引用

23rd International Conference of the European Society for precision engineering and Nanotechnology, EUSPEN 2023

作者： Gebhardt, Andreas Schmidt, Erik Rohde, Mathias Zettlitzer, Lucas Wellinger, Bernhard Fraunhofer Institute for Applied Optics and Precision Engineering IOF Albert-Einstein-Str. 7 Jena07745 Germany Lehmann Präzision GmbH Weilerstraße 27 Hardt78739 Germany

ISBN: (纸本)9781998999132

Exact mounting references manufactured by the alignment turning process are essential in order to effectively assemble high-quality optical systems. In order to extend the capabilities, a concept of a modular alignment turning machine was investigated and realized. The basic approach is a vertical, hydrostatic spindle (C-axis) integrated in a horizontal X-axis. The spindle carries an alignment chuck that manipulates the optical assembly in four degrees of freedom (Tx, Ty, Rx, Ry) according to the on-machine metrology. By moving the X-axis, the spindle-workpiece arrangement can positioned at three vertical Z-axis modules. They can flexible serve as machining or metrology stations. © 2023 Euspen Headquarters.

关键词： Alignment

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Investigation of ultrashort pulse written higher order VBG with extended apertures

Investigation of ultrashort pulse written higher order VBG w...

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2024 Bragg Gratings, Photosensitivity, and Poling in Glass Waveguides, BGPP 2024

作者： Siems, Malte P. Richter, Daniel Krämer, Ria G. Schwartz, Georg R. Nolte, Stefan 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 Center of Excellence in Photonics Albert-Einstein-Straße 7 Jena07745 Germany

In this paper we investigate higher order femtosecond written VBG in fused silica. Focus of this investigation will be on the influence of the Bragg order on the properties across the aperture of the VBG. © Optic... 详细信息

关键词： Fused silica

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Femtosecond Written Chirped Fiber Bragg Gratings for Dispersion Control at 2 µm

Femtosecond Written Chirped Fiber Bragg Gratings for Dispers...

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2024 Bragg Gratings, Photosensitivity, and Poling in Glass Waveguides, BGPP 2024

作者： Schwartz, Georg R. Krämer, Ria G. Siems, Malte P. Ghazagh, Abdolnaser Richter, Daniel Nolte, Stefan Institute of Applied Physics Abbe Center of Photonics Friedrich Schiller University Jena Albert-Einstein-Str. 15 JenaD-07745 Germany Fraunhofer Institute for Applied optics and Precision Engineering IOF Center of Excellence Albert-Einstein-Str. 7 JenaD-07745 Germany

We present femtosecond written CFBGs using a chirped phase mask for dispersion control. A bandwidth of >140 nm and reflectivity of ∼ 70 % were achieved, with tailored dispersion up to the 3rd order. © Optica ... 详细信息

关键词： Fiber Bragg gratings

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Manufacturing of a highly efficient gold coated echelle grating for NIR on a thick silicon substrate with small straylight and wavefront error

Manufacturing of a highly efficient gold coated echelle grat...

引用

2022 International Conference on Space optics, ICSO 2022

作者： Sadlowski, Susann Flügel-Paul, Thomas Wildi, François Wittig, Martin Benkenstein, Tino Nathanael, Jan Trost, Marcus Munzert, Peter Scheler, Michael Zeitner, Uwe D. Fraunhofer Institute for Applied Optics and Precision Engineering IOF Albert-Einstein-Straße 7 Jena07745 Germany Department of Astronomy University of Geneva Chemin Pegasi 51 Sauverny1290 Switzerland

ISBN: (纸本)9781510668034

We present the design, manufacturing and characterization results of a customized high-resolution echelle grating. The grating was manufactured at Fraunhofer iof and delivered to the NIRPS (Near Infrared Planet Searcher Instrument) consortium. The technology workflow for the manufacturing of the echelle grating is relying on wet-chemical etching, applied to crystalline silicon substrates, which enables the creation of highly determined micro-facets and surfaces over macroscopic dimensions. The echelle's grating period and plateau size within one period are established based on electron-beam lithography. A binary pattern in a hard mask material is performed by dry-reactive ion etching while transferring the pattern in the silicon substrate is achieved by wet-chemical etching with potassium hydroxide. The grating is designed to operate at a blaze angle of 76° in a wavelength band of 0.9μm - 1.8μm. A gold coating is applied to increase the diffraction efficiency to about 70%;verified at wavelengths of 1030nm and 1640nm, respectively. The overall grating size is 78mm x 284mm providing a WFE of less than 70nm (RMS) measured throughout the full aperture. In this article we present the manufacturing workflow and structural inspection results of the manufactured echelle grating, having a critical eye on the impact of sub-surface defects of the initial silicon crystal. Moreover, we present optical performance test results covering diffraction efficiency, PSF, WFE and spectral ghosts. It is concluded that the imaging properties of the manufactured grating are as good as those of a plane gold mirror reference. © 2023 SPIE. All rights reserved.

关键词： Aberrations

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