Mr. Florian Just Profile

Florian Just

at Active Fiber Systems GmbH

SPIE Involvement:

Author

Publications (13)

Proceedings Article | 13 March 2024 Presentation

Compact fiber-based sources for broad-range CARS and SRS imaging

Florian Just, Christian Gaida, Sven Breitkopf, Oliver Herrfurth, Tobias Meyer-Zedler, Jürgen Popp, Tino Eidam, Jens Limpert

Proceedings Volume PC12827, PC1282706 (2024) https://doi.org/10.1117/12.3002470

KEYWORDS: CARS tomography, Microscopy, Laser sources, Thermal effects, Resistance, Raman spectroscopy, Photonic crystal fibers, Laser frequency, Laser development, Four wave mixing

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Proceedings Article | 16 March 2023 Presentation

Ultra-compact widely tunable dual-wavelength fiber-based sources for CARS and SRS imaging (Conference Presentation)

Armin Hoffmann, Florian Just, Christian Gaida, Sven Breitkopf, Oliver Herrfurth, Tobias Meyer-Zedler, Jürgen Popp, Tino Eidam, Jens Limpert

Proceedings Volume PC12391, PC123910S (2023) https://doi.org/10.1117/12.2649987

KEYWORDS: CARS tomography, Microscopy, Laser sources, Thermal effects, Raman spectroscopy, Fiber lasers

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Proceedings Article | 1 April 2022 Presentation

Sub-2-cycle carrier-envelope-phase-stable laser providing 1.1-mJ pulses at 110 W average power

Steffen Hädrich, Maxim Tschernajew, Evgeny Shestaev, Fabian Stutzki, Nico Walther, Florian Just, Florian Karl, Sven Breitkopf, Christian Gaida, Oliver Herrfurth, Imre Seres, Zsolt Bengery, Barnabas Gilicze, Péter Jójárt, Zoltán Várallyay, Ádám Börzsönyi, Michael Müller, Christian Grebing, Dominik Hoff, Gerhard Paulus, Tino Eidam, Jens Limpert

Proceedings Volume PC11991, PC119910N (2022) https://doi.org/10.1117/12.2608672

KEYWORDS: Pulsed laser operation, Laser systems engineering, Optical amplifiers, Mirrors, Laser applications, Fiber amplifiers, Energy efficiency, Dielectric mirrors

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Proceedings Article | 5 March 2021 Presentation

Ultra-compact widely tunable dual-wavelength fiber-based sources for CARS and SRS imaging

Armin Hoffmann, Florian Just, Christian Gaida, Sven Breitkopf, Tino Eidam, Jens Limpert

Proceedings Volume 11655, 1165516 (2021) https://doi.org/10.1117/12.2578298

KEYWORDS: CARS tomography, Microscopy, Laser sources, Thermal effects, Research facilities, Raman spectroscopy, Prototyping, Photonic crystal fibers, Four wave mixing, Fiber lasers

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Proceedings Article | 22 February 2017 Paper

All-fiber optical parametric oscillator for bio-medical imaging applications

Thomas Gottschall, Tobias Meyer, Cesar Jauregui, Florian Just, Tino Eidam, Michael Schmitt, Jürgen Popp, Jens Limpert, Andreas Tünnermann

Proceedings Volume 10083, 100831E (2017) https://doi.org/10.1117/12.2250484

KEYWORDS: Optical parametric oscillators, Tunable lasers, Fiber lasers, Signal to noise ratio, Laser systems engineering, Four wave mixing, Laser optics, Optical fibers, Microscopy, Raman scattering, Imaging systems, Oscillators, Interference (communication), Photonic crystal fibers

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Proceedings Article | 22 February 2013 Paper

Design evolution, long term performance and application tests of extra large mode area (XLMA) fiber lasers

Andreas Langner, Mario Such, Gerhard Schötz, Florian Just, Martin Leich, Stephan Grimm, Jan Dellith, Matthias Jäger, Kay Schuster, Hagen Zimer, Marcin Kozak, Björn Wedel, Georg Rehmann, Charley Bachert, Volker Krause

Proceedings Volume 8601, 86010G (2013) https://doi.org/10.1117/12.2000472

KEYWORDS: Fiber lasers, Silica, Absorption, Ytterbium, Cladding, Coating, Aluminum, Backscatter, Laser systems engineering, Doping

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Proceedings Article | 26 April 2012 Paper

The influence of the drawing process on the intrinsic stress in optical fibers and the arising possibility to optimize the birefringence of PM fibers

Florian Just, Matthias Jäger, Hartmut Bartelt

Proceedings Volume 8426, 84260K (2012) https://doi.org/10.1117/12.922599

KEYWORDS: Optical fibers, Birefringence, Cladding, Glasses, Heat treatments, Phase modulation, Refractive index, Polarization, Phase shifts, Temperature metrology

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The properties of optical fibers can significantly be influenced by intrinsic stress. It is well known that these stresses are caused by various reasons, e.g. the variations in the thermal expansion coecient of the differently doped regions in the fiber. The so called thermal stresses are only dependent on the composition of the fiber and not on its preparation history. Another main reason for stress in the final fiber is the mechanical force that is applied during the fiber drawing process. It generates so called mechanical stress that depends on the composition of the fiber and the thermal history of the fiber fabrication process. Using a non-destructive polarimetric system, we are able to measure the intrinsic stress state in optical fibers as well as in their preforms. Knowing on the one hand the thermal induced stresses in the preform of a fiber and on the other hand the final stress state in the fiber itself, we are able to differentiate between the two kinds of stress. In this paper we present results of stress measurements on optical ber preforms and fibers. We show, that the measured stress profile in the preform matches the theoretically assumed stress profile for thermal stress very well. Moreover we used this preform to draw fibers under different drawing conditions represented in a large difference in the applied force during the fiber drawing. We present the stress results for these differently fabricated fibers and show how huge the effect of the drawing tension can be. We find that for high drawing forces, the stress state can be reversed in comparison to the thermal stresses that are induced by the material composition. Due to the fact that stress on the one hand has a strong effect on the mechanical properties of glass and modifies the refractive index, this can lead to signicant effects on the fiber stability and modal behaviour. Finally, we present a way to compensate the additionally induced mechanical stress, which is for example a very good possibility to increase the stress birefringence in polarization maintaining (PM) fibers with panda structure. We compare the mechanical stress states of such Panda Fibers after their fabrication with the state after an additional high temperature step. We clearly find that it is possible to improve the birefringence of these fibers using appropriate preparation steps.

Proceedings Article | 16 February 2012 Paper

Multi-kW single fiber laser based on an extra large mode area fiber design

Andreas Langner, Mario Such, Gerhard Schötz, Florian Just, Martin Leich, Anka Schwuchow, Stephan Grimm, Hagen Zimer, Marcin Kozak, Björn Wedel, Georg Rehmann, Charley Bachert, Volker Krause

Proceedings Volume 8237, 82370F (2012) https://doi.org/10.1117/12.904951

KEYWORDS: Fiber lasers, Silica, Cladding, Signal attenuation, Doping, Refractive index, Absorption, Ytterbium, Laser systems engineering, Laser welding

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Proceedings Article | 10 May 2011 Paper

Preparation and characterization of microstructured silica holey fibers filled with high-index glasses

J. Kobelke, R. Spittel, D. Hoh, K. Schuster, A. Schwuchow, F. Jahn, F. Just, C. Segel, A. Hartung, J. Kirchhof, H. Bartelt

Proceedings Volume 8073, 80732F (2011) https://doi.org/10.1117/12.886243

KEYWORDS: Optical fibers, Arsenic, Glasses, Capillaries, Silica, Micro optical fluidics, Chalcogenide glass, Refractive index, Cladding, Liquids

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Proceedings Article | 11 February 2011 Paper

New developments in high power fiber lasers based on alternative materials

Andreas Langner, Mario Such, Gerhard Schötz, Stephan Grimm, Florian Just, Martin Leich, Christian Mühlig, Jens Kobelke, Anka Schwuchow, Oliver Mehl, Olaf Strauch, Roman Niedrig, Björn Wedel, Georg Rehmann, Volker Krause

Proceedings Volume 7914, 79141U (2011) https://doi.org/10.1117/12.876978

KEYWORDS: Fiber lasers, Silica, Cladding, Signal attenuation, Refractive index, Absorption, Laser induced damage, Doping, Ytterbium, Laser development

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Proceedings Article | 18 May 2010 Paper

Thermal stress anomaly in rare-earth-doped fiber materials for high-power fiber lasers codoped with aluminum and phosphorus

F. Just, S. Unger, J. Kirchhof, V. Reichel, H. Bartelt

Proceedings Volume 7721, 772106 (2010) https://doi.org/10.1117/12.854193

KEYWORDS: Aluminum, Phosphorus, Refractive index, Doping, Ytterbium, Glasses, Silica, Optical fibers, Cladding, Superposition

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Proceedings Article | 17 February 2010 Paper

Development, manufacturing and lasing behavior of Yb-doped ultra large mode area fibers based on Yb-doped fused bulk silica

Andreas Langner, Mario Such, Gerhard Schötz, Volker Reichel, Stephan Grimm, Florian Just, Martin Leich, Johannes Kirchhof, Björn Wedel, Gunnar Köhler, Olaf Strauch, Oliver Mehl, Volker Krause, Georg Rehmann

Proceedings Volume 7580, 75802X (2010) https://doi.org/10.1117/12.845761

KEYWORDS: Cladding, Silica, Optical fibers, Fiber lasers, Refractive index, Doping, Connectors, Semiconductor lasers, Ions, Glasses

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