Publications

14 Publikationen filtern

Die Publikationen filtern

Highlighted authors are members of the University of Jena.

  1. Avoiding the tip: spiral optics for robust high power beam shaping of Bessel beams

    Year of publicationPublished in:Optics Express M. Siems, J. Thomas, H. Gross, A. Schöneberg, S. Nolte
    Bessel Gaussian beams offer unique possibilities in material processing due to their elongated high-intensity line foci. They are usually created using an axicon. Being used with high power, the most critical part of the axicon is its tip, as it is prone to laser-induced damage. Any imperfection of the tip can be the source of aberrations of the focus. Therefore, we propose to apply Laguerre Gaussian beam shaping to circumvent the tip of the axicon altogether. We introduce an optical system consisting of spiral phase plates and an axicon to combine Laguerre and Bessel Gaussian beam shaping. This system is experimentally implemented using custom-made spiral phase plates and a large angle axicon. We characterize and finally apply the system to glass cutting and demonstrate the cleaving of a 2 mm thick glass sample, which results in a high-quality breaking edge with sub-micron roughness.
    University Bibliography Jena:
    fsu_mods_00023856External link

  3. Quantum key distribution with entangled photons in daylight

    Year of publication A. Kržič
    Quantum key distribution (QKD) offers means to transmit data with unprecedented security, ultimately promising to remove the need to trust anything or anyone involved but the laws of quantum mechanics. The use of entangled photons as quantum information carriers seems particularly well suited for this purpose. One of the main challenges for implementation over free-space channels is operation in daylight. During the day, the receiver system collects a large amount of sunlight that materializes as noise, which requires filtering in every available degree of freedom. Spatial filtering is further hindered by atmospheric turbulence. The vast majority of free-space QKD experiments to date have been thus limited to nighttime conditions. This thesis aims to provide the next stepping stone in the development of entanglement-based QKD over free-space channels in daylight. An experimental system for polarization-based QKD was developed and deployed over a 1.7-km urban free-space link. The system incorporates tip-tilt correction to mitigate the effects of atmospheric turbulence and a dedicated adjustable spatial filter to enable daytime operation. The system's daytime QKD performance is experimentally demonstrated, showcasing key rates of about 2.5 kbps in direct noon sunlight, which is an improvement of entanglement-based QKD daylight capability by an order of magnitude in both secure key rate and link range. This is followed by a more thorough investigation of the role of spatial filtering on QKD in daylight. Furthermore, it is shown that active adjustment of the system field of view to the ever-changing link conditions has the potential to substantially improve the overall secure key output of the system. The thesis concludes with a numerical simulation of a satellite-based implementation, which shows that the first daytime QKD from an orbiting satellite is within reach.
    University Bibliography Jena:
    fsu_mods_00016584External link

  4. Field curvature reduction in miniaturized high numerical aperture and large field-of-view objective lenses with sub 1 μm lateral resolution

    Year of publicationPublished in:Biomedical Optics Express S. Stark, H. Gross, K. Reglinski, B. Messerschmidt, C. Eggeling
    In this paper the development of a miniaturized endoscopic objective lens for various biophotonics applications is presented. While limiting the mechanical dimensions to 2.2 mm diameter and 13 mm total length, a numerical aperture of 0.7 in water and a field-of-view (FOV) diameter of 282 μm are achieved. To enable multimodal usage a wavelength range of 488 nm to 632 nm was considered. The performed broad design study aimed for field curvature reduction when maintaining the sub 1 μm resolution over a large FOV. Moreover, the usage of GRadient-INdex (GRIN) lenses was investigated. The resolution, field curvature improvement and chromatic performance of the novel device were validated by means of a confocal laserscanning- microscope.
    University Bibliography Jena:
    fsu_mods_00009462External link

  5. Pupil slicer at high throughput for the EXtreme Precision Spectrograph (EXPRES) at the Lowell Discovery Telescope

    Year of publicationPublished in:SPIE Astronomical Telescopes + Instrumentation; Montreal, Canada; 17 July 2022 - 22 July 2022 E. Beckert, D. Fischer, R. Blackman, C. Jurgenson, O. de Vries, H. Gross, R. Hambach, O. DeVries
    University Bibliography Jena:
    fsu_mods_00009444External link

  6. Material-specific high-resolution table-top extreme ultraviolet microscopy

    Year of publicationPublished in:Light: Science and Applications W. Eschen, L. Lötgering, V. Schuster, R. Klas, A. Kirsche, L. Berthold, M. Steinert, T. Pertsch, H. Gross, M. Krause, J. Limpert, J. Rothhardt
    Microscopy with extreme ultraviolet (EUV) radiation holds promise for high-resolution imaging with excellent material contrast, due to the short wavelength and numerous element-specific absorption edges available in this spectral range. At the same time, EUV radiation has significantly larger penetration depths than electrons. It thus enables a nano-scale view into complex three-dimensional structures that are important for material science, semiconductor metrology, and next-generation nano-devices. Here, we present high-resolution and material-specific microscopy at 13.5 nm wavelength. We combine a highly stable, high photon-flux, table-top EUV source with an interferometrically stabilized ptychography setup. By utilizing structured EUV illumination, we overcome the limitations of conventional EUV focusing optics and demonstrate high-resolution microscopy at a half-pitch lateral resolution of 16 nm. Moreover, we propose mixed-state orthogonal probe relaxation ptychography, enabling robust phase-contrast imaging over wide fields of view and long acquisition times. In this way, the complex transmission of an integrated circuit is precisely reconstructed, allowing for the classification of the material composition of mesoscopic semiconductor systems.
    University Bibliography Jena:
    fsu_mods_00000362External link

  7. Material-specific ptychographic imaging at 13.5 nm using a high-order harmonic source

    Year of publicationPublished in:Compact EUV & X-ray Light Sources: part of High Brightness : 21-25 March 2022, Budapest, Hungary W. Eschen, L. Loetgering, V. Schuster, R. Klas, A. Kirsche, L. Berthold, M. Steinert, T. Pertsch, H. Gross, M. Krause, J. Limpert, J. Rothhardt
    University Bibliography Jena:
    fsu_mods_00001772External link

  8. New Surface Contributions for Higher Order Color Aberrations and Chromatic Variations of Seidel Aberrations

    Year of publicationPublished in:International Optical Design Conference 2021: part of Optical Design and Fabrication : 27 June-1 July 2021, Washington, DC, United States A. Berner, H. Gross
    University Bibliography Jena:
    fsu_mods_00000556External link

  9. A benchmarked vectorial model and flexible software-tool for in-bulk laser processing

    Year of publicationPublished in:Conference proceedings from OSA Publishing Q. Li, M. Chambonneau, M. Blothe, H. Gross, S. Nolte
    University Bibliography Jena:
    fsu_mods_00006330External link

  10. Holistic simulation of optical systems

    Year of publication J. Stock
    For many years, the design of optical systems mainly comprised a linear arrangement of plane or spherical components, such as lenses, mirrors or prisms, and a geometric-optical description by ray tracing lead to an accurate and satisfactory result. Today, many modern optical systems found in a variety of different industrial and scientific applications, deviate from this structure. Polarization, diffraction and coherence, or material interactions, such as volume or surface scattering, need to be included when reasonable performance predictions are required. Furthermore, manufacturing and alignment aspects must be considered in the design and simulation of optical systems to ensure that their impact is not damaging to the overall purpose of the corresponding setup. Another important part is the growing field of digital optics. Signal processing algorithms have become an indispensable part of many systems, whereby an almost unlimited number of current and potential applications exists. Since these algorithms are an essential part of the system, their compatibility and impact on the completed system is an important aspect to con- sider. In principle, this list of relevant topics and examples can be further expanded to an almost unlimited extend. However, the simulation and optimization of the single sub-aspects do often not lead to a satisfactory result. The goal of this thesis is to demonstrate that the performance prediction of modern optical systems benefits significantly from an aggregation of the individual models and technological aspects. Present concepts are further enhanced by the development and analysis of new approaches and algorithms, leading to a more holistic description and simulation of complex setups as a whole. The long-term objective of this work is a comprehensive virtual and rapid prototyping. From an industrial perspective, this would reduce the risk, time and costs associated with the development of an optical system.
    University Bibliography Jena:
    fsu_mods_00011256External link

  11. Theory and application of induced higher order color aberrations

    Year of publication A. Berner
    Induced aberrations in general are higher-order aberrations caused by ray perturbations of lower order, picked up surface by surface in the preceding optical system. Therefore, induced aberration coefficients are depending on the cumulative preexisting aberrations in the system. In case of color aberrations, induced influences are already observable in the paraxial regime, since even paraxial rays are affected by dispersion. Hence, in every optical system small perturbations in ray heights and ray angles for paraxial rays of different wavelengths are present. These ray perturbations generate induced color aberration effects of higher-order. Here, different orders refer to the paraxial ray dependency on dispersion. The linear or 1st-order terms result in the well-known Seidel contributions of axial and lateral color, where any interaction of dispersion between different lenses is neglected. Starting at 2nd-order terms, induced color effects are present. In this thesis, an introduction on the basic idea of induced color aberrations is given, followed by a surface resolved analytical description for 2nd-order axial and lateral color as well as for the chromatic variations of the five Seidel aberrations. A differentiation between induced and intrinsic parts is derived and discussed. Illustrated by descriptive academic systems as well as by a complex microscopic design example, the importance and the influences of induced color aberrations for optical systems is demonstrated.
    University Bibliography Jena:
    fsu_mods_00011148External link

  12. Integrated approach to realize top hat focal field distributions

    Year of publicationPublished in:Applied Industrial Optics: Spectroscopy, Imaging and Metrology: part of Imaging and Applied Optics : 26-29 June 2017, San Francisco, California, United States S. Schmidt, S. Thiele, A. Herkommer, H. Giessen, H. Groß
    University Bibliography Jena:
    fsu_mods_00001647External link
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