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Optical Interference Coatings, OIC 2022

作者： Bergner, Alexander Munser, Anne-Sophie Herffurth, Tobias Schröder, Sven Trost, Marcus Fraunhofer Institute Applied Optics and Precision Engineering IOF Albert-Einstein-Str. 7 Jena07745 Germany Institute for Applied Physics Abbe Center of Photonics Friedrich-Schiller University Albert-Einstein-Str. 15 Jena07745 Germany

The optical performance of coatings critically depends on the surface roughness, defects, and particles on the substrate. These imperfections can be elegantly characterized by light scattering, which also enables the ... 详细信息

ISBN: (纸本)9781957171043

关键词： Surface roughness

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Large-Area Sub-5nm Plasmonic Nanogap Arrays: Advanced Fabrication, Characterization and Applications

Large-Area Sub-5nm Plasmonic Nanogap Arrays: Advanced Fabric...

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

作者： Gour, Jeetendra Beer, Sebastian Paul, Pallabi Alberucci, Alessandro Szeghalmi, Adriana Peschel, Ulf Nolte, Stefan Zeitner, Uwe D. Friedrich Schiller University Jena Institute of Applied Physics Albert Einstein Str. 15 Jena07745 Germany Fraunhofer Institute for Applied Optics and Precision Engineering IOF Albert-Einstein-Str. 7 Jena07745 Germany Friedrich Schiller University Jena Institute of Solid State Theory and Optics Max-Wien Platz 1 Jena07743 Germany Munich University of Applied Sciences Department of Applied Sciences and Mechatronics Loristr. 19 Jena Munich80335 Germany

ISBN: (纸本)9798350345995

In recent years, there has been a growing interest in the study of plasmonic nanogaps, specifically in understanding the fundamental physics of localized surface plasmon resonances (LSPR) and of their interplay with optically induced electron transitions through these tiny gaps. Accordingly, many efforts have been made in fabricating nanogaps with precise control over their thickness and shape. While there are several established methods to achieve such a delicate task, many of them struggle with achieving sub-5nm resolution, reproducibility, and/or scalability over wide areas [1]. However, recent technological advancements in the atomic layer deposition (ALD) technique have brought us closer to realizing metasurfaces featuring extremely thin nanogaps down to single-nanometer widths and fulfilling all the demanding requirements listed above [2]. © 2023 IEEE.

关键词： Electron transitions

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Fluorescence Excitation of Quantum Dots by Entangled Two-Photon Absorption

Fluorescence Excitation of Quantum Dots by Entangled Two-Pho...

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2023 Conference on Lasers and Electro-optics, CLEO 2023

作者： Gäbler, Tobias B. Hendra, Patrick Jain, Nitish Prenzel, Erik Gräfe, Markus Fraunhofer Institute of Applied Optics and Precision Engineering IOF Albert-Einstein-Straße 7 JenaD-07745 Germany Friedrich-Schiller-UniversitätJena Abbe Center of Photonics Max-Wien-Platz 1 JenaD-07745 Germany Technische Universität Darmstadt Institute of Applied Physics Hochschulstraße 6 DarmstadtD-64289 Germany

A photon pair source based on nonlinear waveguides was used to investigate fluorescence excitation of quantum dots. We present a comprehensive study of entangled absorption behavior by varying experimental quantities ... 详细信息

ISBN: (纸本)9781957171258

关键词： Semiconductor quantum dots

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Mid-Infrared Quantum Scanning Microscopy with Visible Light

Mid-Infrared Quantum Scanning Microscopy with Visible Light

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2023 Conference on Lasers and Electro-optics, CLEO 2023

作者： Leon-Torres, Josue Ricardo Fuenzalida, Jorge Gilaberte, Marta Topfer, Sebastian Grafe, Markus Fraunhofer Institute of Applied Optics and Precision Engineering IOF Albert-Einstein-Straβe 7 JenaD-07745 Germany Friedrich-Schiller-Universitdt Jena Abbe Center of Photonics Max-Wien-Platz 1 JenaD-07745 Germany Technische Universitat Darmstadt Institute of Applied Physics Hochschulstraβe 6 DarmstadtD-64 289 Germany

A label-free quantum scanning imaging system is presented, capable of detecting in the visible regime, while illuminating with undetected light in the Mid-IR region by exploiting the quantum correlations of photon-pai...

ISBN: (纸本)9781957171258

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Thick femtosecond-inscribed silica VBGs for mid-IR spectral filtering applications

Thick femtosecond-inscribed silica VBGs for mid-IR spectral ...

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

作者： Talbot, Lauris Siems, Malte Per Richter, Daniel David, Nicolas Blais-Ouellette, Sébastien Nolte, Stefan Bernier, Martin Université Laval QuébecG1V 0A6 Canada Institute of Applied Physics Abbe Center of Photonics Friedrich Schiller University Jena Jena07745 Germany Photon Etc. MontréalH2S 2X3 Canada Fraunhofer Institute for Applied Optics and Precision Engineering IOF Center of Excellence in Photonics Jena07745 Germany

We report on the femtosecond inscription of a 3 mm thick silica volume Bragg grating. By combining it with a mid-IR supercontinuum laser, a narrowband light source tunable from 2.8 to 4.3 μm is obtained. © Optic... 详细信息

关键词： Femtosecond lasers

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A novel vegetation index for the detection and age determination of tree resin

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Measurement: Sensors 2024年 38卷

作者： Richter, Martin Rosenberger, Maik Notni, Gunther Technische Universität Ilmenau Department of Mechanical Engineering Group for Quality Assurance and Industrial Image Processing Ilmenau Germany Fraunhofer Institute for Applied Optics and Precision Engineering IOF Jena Germany

In this work, we analysed the reflectance spectrum of spruce trees with the aim of deriving an index based on the NDVI principle that allows easy and fast identification of tree resin on and around spruce trees. The proposed normalized resin difference index uses a wavelength of 1688 nm in combination with either 1093 nm, 1138 nm or 1282 nm to reliably distinguish resin traces from bark and moss. Based on the initial experiments, the proposed index may be promising to be used as an indicator of the age of the resin. © 2024

关键词： Miocene

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Design and evaluation of miniaturized high numerical aperture and large field-of-view microscope objectives with reduced field curvature 18

Design and evaluation of miniaturized high numerical apertur...

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Endoscopic Microscopy XVIII 2023

作者： Schulz, S.L. Gross, H. Eggeling, C. Messerschmidt, B. GRINTECH GmbH Otto-Eppenstein-Str. 7 Jena07745 Germany Fraunhofer Institute for Applied Optics and Precision Engineering IOF Albert-Einstein-Str. 7 Jena07745 Germany Institute of Applied Optics and Biophysics Friedrich-Schiller-University Jena Max-Wien-Platz 4 Jena07743 Germany Leibniz Institute of Photonic Technology e.V. Albert-Einstein-Str. 9 Jena07745 Germany

ISBN: (纸本)9781510658172

Microbiological imaging in compact and integrated devices allows for a variety of applications such as endomicroscopy or neuroscience. Typically, such devices require a large field-of-view with a high resolution to visualize cellular details and a high light collection efficiency to improve the signal-to-noise ratio and reduce exposure times. Thus, high numerical apertures are required. Miniature objectives with a numerical aperture of 0.7, a field-of-view diameter of 264 µm in the sample plane and color correction for a wide spectral range (450 nm – 900 nm) are offered by the company GRINTECH GmbH. However, while these accept curved sample fields as a degree of freedom, many demanding applications in the area of endo- and point-of-care-microscopy desire a field as flat as possible. In the scope of this work a broad optical design study was conducted to minimize the optical curvature of the object field. After having worked out 16 design approaches, the three best designs were shortlisted and investigated considering optical and mechanical design tolerances. The best as-built design was chosen and prototypes made of 6 lenses were manufactured. The diameter of the mounted objective is 2.2 mm with a total length of 13 mm. The performance of the novel micro system was experimentally evaluated by means of a confocal laser-scanning-microscope. © 2023 SPIE.

关键词： Optical design

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Photon-Pair Recombination via Sum-Frequency Generation by Chirped, Aperiodically Poled LiNb Waveguide

Photon-Pair Recombination via Sum-Frequency Generation by Ch...

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

作者： Hendra, Patrick León-Torres, Josué Ricardo Gräfe, Markus Fraunhofer Institute of Applied Optics and Precision Engineering IOF Albert-Einstein-Straße 7 Jena07745 Germany Abbe Center of Photonics Friedrich-Schiller-Universität Jena Albert-Einstein-Straße 6 Jena07745 Germany Institute of Applied Physics Technical University of Darmstadt Schloßgartenstraße 7 Darmstadt64289 Germany

ISBN: (纸本)9798350345995

In the past couple of decades, the use of quantum states of light has been gaining interest in different disciplines from telecommunications to imaging and sensing due to its non-classical features that allow to exceed classical limitations. A quantum enhancement in fluorescence microscopy has been explored in a recent study, whereby, time-frequency-entangled photon pairs generated through spontaneous parametric down conversion (SPDC) process were used to demonstrate linear absorption rates in standard fluorophores by the virtue of entangled two-photon absorption (ETPA) [1]. Meanwhile, a prior study on sum-frequency generation (SFG) with down-converted photon pairs has demonstrated that the rate of photon pair recombination is linearly proportional to the down-converted bandwidth [2]. In other words, as the bandwidth of the down-converted photon pairs increases, it reduces the temporal separation between the photons, which in turn, increases the probability for up-conversion via SFG. © 2023 IEEE.

关键词： Bandwidth

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Mid-Infrared Quantum Scanning Microscopy with Visible Light

Mid-Infrared Quantum Scanning Microscopy with Visible Light

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

作者： León-Torres, Josué Ricardo Fuenzalida, Jorge Gilaberte, Marta Töpfer, Sebastian Gräfe, Markus Fraunhofer Institute of Applied Optics and Precision Engineering IOF Albert-Einstein-Straße 7 JenaD-07745 Germany Friedrich-Schiller-Universität Jena Abbe Center of Photonics Max-Wien-Platz 1 JenaD-07745 Germany Institute of Applied Physics Technische Universität Darmstadt Schloßgartenstraße 6 DarmstadtD-64289 Germany

ISBN: (纸本)9798350345995

Laser scanning microscopy (LSM) is known to be the workhorse for modern life-science, it allows to get new insights into a variety of biological processes. LSM together with illumination in the mid infrared region (Mid-IR) permits to map the chemical composition of samples to a space frame. However, low-light observations in the Mid-IR spectrum are still challenging and a limiting factor for a faster development. A label-free quantum scanning imaging system is presented here, capable of performing the detection in the visible regime, while the illumination is carried out in the Mid-IR region. Our quantum imaging with undetected light implementation aims to retrieve amplitude and phase images of biological samples containing a variety of functional groups that are present in the Mid-IR region. © 2023 IEEE.

关键词： Infrared devices

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Detecting residuals at plastic samples to optimize laser cutting processes 34

Detecting residuals at plastic samples to optimize laser cut...

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Pattern Recognition and Tracking XXXIV 2023

作者： Madrin, Febby Purnama Dittrich, Paul-Gerald Schneider, Lena Werner, Samuel Rosenberger, Maik Notni, Gunther Seul, Thomas Technical University Ilmenau Faculty of Mechanical Engineering Group for Quality Assurance and Industrial Image Gustav-Kirchhoff-Platz 2 Ilmenau98693 Germany Fraunhofer Institute for Applied Optics and Precision Engineering IOF Department Imaging and Sensing Albert-Einstein-Strasse 7 Jena07745 Germany University of Applied Science Schmalkalden Faculty of Mechanical Engineering Group for Applied Plastics Technology Blechhammer 4-9 Schmalkalden98574 Germany

ISBN: (数字)9781510661691

ISBN: (纸本)9781510661684

When using a molding machine to produce plastic samples, unwanted residuals can occur. Within this study two image processing methods for the detection of residuals at plastic samples are evaluated. The aim of the two suggested methods is to detect the position of the residuals at the plastic sample reliable and to transform the image-based information into laser machine coordinates. By using the transferred coordinates, the laser machine can remove the detected residuals by laser cutting accurately without damaging the sample. The measurement setup for both methods is identical, the difference is in the processing of the captured raw image. The first method compares the raw image with the image masking template to determine the residual. The second method processes the raw image directly by comparing the light intensity transmitted through the sample to distinguish the residual from the main sample. Once the residuals can be detected, binary shifting are then performed to locate the cut lines for the residuals. The lines obtained from the image in pixel scale must then be accurately converted into millimeter-scale so that the laser machine can use them. By comparing the two methods mentioned above, the method that uses template images has more accurate and detailed results, leaving no small residuals on the sample. Meanwhile, in the method that compares the intensity of the transmitted light through the sample, there were undetectable residuals that did not produce the desired straight line. However, using the image template-matching method has some drawbacks, such as requiring each measurement to be in the same position. And thus, a more detailed design process is needed to stabilize the measurement process. In this study, a design has been made in terms of hardware as well as software with a GUI that can set several important parameters for measurement. From the results of this study, we obtained a system that can cut the residuals on the sample without damaging

关键词： Laser beams

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