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

作者： Chandroth P. Jisha Alessandro Alberucci Stefan Nolte Friedrich Schiller University Institute of Applied Physics Jena Germany Fraunhofer Institute for Applied Optics and Precision Engineering IOF Jena Germany

ISBN: (纸本)9798350345995

Liquid crystals are fundamental in all modern opto-electronic devices. They have the peculiar property of being intermediate between liquids and solids: in fact, the optic axis of the liquid crystal can be changed locally by applying external perturbations and stimuli [1]. An accurate estimate of the electro-optical properties is of primary importance for both for applications as well as fundamental science [2]. For example, slight discrepancies in the elastic constants can predict huge variation in the phase retardation imparted on the optical field, when used as a tunable waveplate. Scientific machine learning (SciML) has recently found application in all areas of science. Here we use SciML [3] to characterize a liquid crystal cell and go beyond the standard techniques which usually have no access to the point by point optic axis orientation inside the cell.

关键词： Deep learning Inverse design Liquid crystals Machine learning Neural networks Optical fields

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Optical Dispersion in Waveguides Based upon the Pancharatnam-Berry Phase

Optical Dispersion in Waveguides Based upon the Pancharatnam...

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

作者： Stree Vithya Arumugam Chandroth P. Jisha Alessandro Alberucci Stefan Nolte Friedrich Schiller University Institute of Applied Physics Jena Germany Fraunhofer Institute for Applied Optics and Precision Engineering IOF Jena Germany

ISBN: (纸本)9798350345995

Optical waveguides usually exploit modulation of the dynamic phase, i.e., transverse gradient in the refractive index, to guide light. Recently, a novel type of optical waveguides based upon the Pancharatnam-Berry phase (PBP) has been introduced [1]. The PBP is a type of geometric phase which is determined by the path traced by the polarization on the Poincaré sphere. For example, PBP gained by a circularly polarized (CP) beam after crossing a half-wave plate (HWP) is twice the rotation angle of the crystal, the sign being dictated by the photon helicity [2]. Hence, an inhomogeneous rotation in the transverse plane induces a transverse phase gradient. However, the PBP does not accumulate in propagation if the structure is uniform along the longitudinal (propagation) direction. A net accumulation, and thus localization, is achieved when the anisotropic material is periodically perturbed along the propagation direction. The optimum is indeed attained when the longitudinal modulation is synchronized with the natural rotation of the polarization [1], [3].

关键词： Berry phase Gradient index optics Phase modulation Polarization Refractive index Waveguides

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Adjustable spatial filter for optimal free-space quantum communication round the clock

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optics Express 2023年第20期31卷 32362-32372页

作者： Kržič, Andrej Döll, Nico Chandrashekara, Uday Spiess, Christopher Steinlechner, Fabian Fraunhofer Institute for Applied Optics and Precision Engineering Albert-Einstein-Str. 7 Jena07745 Germany Abbe Center of Photonics Friedrich Schiller University Jena Albert-Einstein-Str. 6 Jena07745 Germany

Free-space quantum communication in daylight relies crucially on spatial filtering. The optimal filter configuration, however, depends on ever-changing link conditions. To this end, we developed an adjustable spatial filter that can be used to change the system field of view on the fly. We demonstrate its use in quantum key distribution over a 1.7-km free-space link. Furthermore, we compare it to filtering with multi-mode fiber coupling. Finally, we extrapolate our results to a broader range of realistic link conditions and show that active field-of-view optimization has the potential to substantially improve the overall secure key output of the system. © 2023 Optica Publishing Group.

关键词： Quantum communication

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All-numerical optimization of deformable mirrors

All-numerical optimization of deformable mirrors

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2024 Adaptive optics: Methods, Analysis and Applications, AOMS 2024 - Part of Optica Imaging Congress

作者： Goy, Matthias Böttner, Paul Heinig, Daniel de Dios, Pedro Emerging Techologies Department Fraunhofer Institut for Applied Optics and Precision Engineering IOF Albert-Einstein-Str. 7 JenaD-07745 Germany Friedrich Schiller University Faculty of Physics and Astronomy Jena Max-Wien-Platz 1 Jena07743 Germany

The growing market of space-borne telescopes requires adaptive optical correctors to compensate for system aberrations. This work will provide a method for an all-numerical approach of optimizing deformable mirrors fo... 详细信息

关键词： Mirrors

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Second harmonic generation in periodical metal-insulator-metal nanoparticle arrays

Second harmonic generation in periodical metal-insulator-met...

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

作者： Beer, Sebastian Gour, Jeetendra Mir, Umair Alberucci, Alessandro Zeitner, Uwe Detlef Nolte, Stefan 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 Munich University of Applied Sciences Loristr. 19 München80335 Germany

ISBN: (纸本)9798350345995

The collective oscillation of free electrons in metals (plasmon) leads to a localized field enhancement at the surface. Structures with periodically arranged metallic nano-particles possess two plasmonic resonances: one from the individual nano-particles (localized surface plasmon resonance, LSPR) and one from the collective response triggered by the periodic arrangement (surface lattice resonance, SLR) [1]. Whereas the LSPR is fixed by the sample geometry, the spectral position of the SLR is tuneable with the optical angle of incidence. Both the resonances as well as plasmonic nano-gaps are associated to a strong field enhancement, which can boost nonlinear optical effects. © 2023 IEEE.

关键词： Harmonic generation

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Fresnel reflection reduction of standard single mode fiber end surfaces via fs laser induced surface structuring

Fresnel reflection reduction of standard single mode fiber e...

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

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

ISBN: (纸本)9798350345995

The use of optical fibers has become indispensable. However, for many applications an important aspect is the suppression of Fresnel reflection losses at the fiber end surfaces, as they cause not only losses, but can cause also interfering signals. One approach to overcome this is surface micro structuring, which leads to a gradual decrease of the average refractive index from the material to the surrounding, suppressing the Fresnel reflection [1]. A convenient option for this is the usage of femtosecond lasers for the generation of laser induced surface structures (LIPSS) [4]. This has successfully been shown among others for fused silica bulk materials [5] and polycrystalline infrared fibers [6], but not for standard single mode fused silica fibers. © 2023 IEEE.

关键词： Fused silica

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Stabilization of fiber-based interferometer with single photons

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

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Conference on Lasers and Electro-optics (CLEO)

作者： Christopher Spiess Luis Javier González Martin Del Campo Nicolas Eduardo Tangarife Villamizar Fabian Steinlechner Fraunhofer Institute for Applied Optics and Precision Engineering IOF Jena Germany Friedrich Schiller University Jena Jena Germany

Stabilizing fiber-based interferometers is a challenge. Here we show a visibility of 0.96 ±0.03 (phase resolution σ λ = 0.012λ ) by only single-photon processing with fiber phase variations of 230°/s. Ap... 详细信息

ISBN: (纸本)9781957171258

关键词： Coherent communications Phase modulation Photons Quantum communications Quantum key distribution Single photon detectors

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Ultrafast laser micromachining using wavelengths from ∼ 0.2 µm to ∼ 2 µm 25

Ultrafast laser micromachining using wavelengths from ∼ 0.2...

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Frontiers in Ultrafast optics: Biomedical, Scientific, and Industrial Applications XXV 2025

作者： Flamm, Daniel Sailer, Marc Grossmann, Daniel Günther Rübling, Steffen Decker, Dennis Gaida, Christian Blothe, Markus Sutter, Dirk Nolte, Stefan TRUMPF Laser- und Systemtechnik GmbH Ditzingen71254 Germany TRUMPF Laser GmbH Schramberg78713 Germany Active Fiber Systems GmbH Jena07745 Germany Friedrich Schiller University Jena Institute of Applied Physics Abbe Center of Photonics Jena07745 Germany Fraunhofer Institute for Applied Optics and Precision Engineering IOF Jena Center of Excellence in Photonics Jena07745 Germany

ISBN: (纸本)9781510684546

We review micromachining strategies with optimized energy deposition from ultrafast lasers operating with wavelengths from 1980 nm down to 257 nm. By discussing multifarious machining concepts, such as, e.g., in-volume silicon processing (NIR), drilling of fine-metal masks (green), or cutting of polymer foils (DUV), we show how processing benefits from adapted photon energies or tighter foci. In all cases, an optimized processing solution is achieved precisely when light source, beam shaping and focusing concept are tailored to each other and to the respective light-material interaction. © 2025 SPIE.

关键词： Ultraviolet lasers

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Laser Beam Soldering of exotic optic materials

Laser Beam Soldering of exotic optic materials

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2022 International Conference on Space optics, ICSO 2022

作者： Rodriguez, G. Rosario Beckert, E. Hornaff, M. Peschel, T. Schmidt, T. Heimberg, M. Fraunhofer Institute for Applied Optics and Precision Engineering IOF Albert-Einstein-Str. 7 Jena07745 Germany Friedrich-Schiller-University Jena Institute for Applied Physics Abbe Center of Photonics Jena Germany SpaceOptix GmbH Hans-Knöll-Straße 6 Jena07745 Germany

ISBN: (纸本)9781510668034

Low-stress bonding using the laser-based soldering technique Solderjet Bumping is presented for the assembly of optical systems. Selected systems include SQ1 and INVAR 36 (baseline system), CaF2 and 1.4371 stainless steel, BBO and Dilver P1, and KTP and Super Invar, the first two proposed as lens demonstrators and the other two as laser crystal demonstrators. Solder parameters found for the SQ1 and INVAR using the DoE method using 400μm SAC305 alloy with the desirability of 0.655, for BBO and Dilver P1 and CaF2 and stainless steel 1.4371 systems, parameters must be changed due to damage observed in the optical components. KTP and Super Invar system parameters are still under investigation. In the case of BBO, the parameters were successfully found while CaF2 is still under investigation, changing the solder bump size due to the constant presence of damage in the samples. Finite elements simulations show that excessive stress occurs locally at the singularity of the soldered interface, but is still below the critical value, nevertheless, the survival of the demonstrators under environmental loads (Δ60 K, 600 g) is expected. © 2023 SPIE. All rights reserved.

关键词： Adhesives

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Design and fabrication of a novel phase mask to inscribe fiber Bragg gratings for astronomical applications

Design and fabrication of a novel phase mask to inscribe fib...

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2023 Conference on Lasers and Electro-optics, CLEO 2023

作者： Rahman, Aashia Siefke, Thomas Madhav, Kalaga Goebel, Thorsten A. Ghazagh, Abdolnaser Zeitner, Uwe D. Luo, Xijie Richter, Daniel Nolte, Stefan Roth, Martin M. An der Sternwarte Potsdam14482 Germany Friedrich Schiller University Jena Institute of Applied Physics Albert-Einstein-Str. 15 Jena07745 Germany Fraunhofer Institute for Applied Optics and Precision Engineering IOF Center of Excellence in Photonics Albert-Einstein-Str. 7 Jena07745 Germany

A novel phase mask (PM) consisting of overlapped regions of more than one uniform pitch is fabricated using e-beam lithography. Design, fabrication of PMs, and filter characteristics are presented. © Optica Publi... 详细信息

ISBN: (纸本)9781957171258

关键词： Fabrication

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