Dr. Sigrun Hein Profile

Dr. Sigrun Hein

at Fraunhofer-IOF

SPIE Involvement:

Author

Publications (12)

Proceedings Article | 12 March 2024 Presentation + Paper

Temperature-dependent fluorescence and site-selective excitation studies of ytterbium doped silica

Brian Topper, Alexander Neumann, Stefan Kuhn, Denny Häßner, Sigrun Hein, Christian Hupel, Johannes Nold, Nicoletta Haarlammert, Arash Mafi, Thomas Schreiber

Proceedings Volume 12865, 128650F (2024) https://doi.org/10.1117/12.3000259

KEYWORDS: Absorption, Silica, Fluorescence, Ytterbium, Fiber lasers, Emission wavelengths, Spectroscopy, Glasses

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Proceedings Article | 15 March 2023 Presentation + Paper

Laser cooling silica: current status and future prospects

Brian Topper, Alexander Neumann, Alexander Albrecht, Angel Flores, Stefan Kuhn, Denny Häßner, Sigrun Hein, Christian Hupel, Johannes Nold, Nicoletta Haarlammert, Thomas Schreiber, Mansoor Sheik-Bahae, Arash Mafi

Proceedings Volume 12437, 1243703 (2023) https://doi.org/10.1117/12.2655228

KEYWORDS: Ytterbium, Silica, Fluorescence, Glasses, Aluminum, Spectroscopy, Emission wavelengths, Air force, Absorption, Temperature metrology

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Proceedings Article | 9 March 2022 Presentation

Advances in the optical refrigeration of silica: cooling by 18 K from room temperature

Brian Topper, Mostafa Peysokhan, Alexander Albrecht, Angel Flores, Stefan Kuhn, Denny Häßner, Sigrun Hein, Christian Hupel, Johannes Nold, Nicoletta Haarlammert, Thomas Schreiber, Mansoor Sheik-Bahae, Arash Mafi

Proceedings Volume PC12018, PC1201808 (2022) https://doi.org/10.1117/12.2610103

KEYWORDS: Silica, Optical fibers, Ytterbium, Temperature metrology, Thermometry, Optical amplifiers, Luminescence, High power fiber amplifiers, Glasses, Cameras

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Proceedings Article | 4 March 2022 Presentation + Paper

500 W average power, multicore fiber-based femtosecond CPA system

Arno Klenke, A. Steinkopff, C. Aleshire, C. Jauregui, Stefan Kuhn, Johannes Nold, Christian Hupel, Sigrun Hein, Steffen Schulze, Nicoletta Haarlammert, Thomas Schreiber, Andreas Tünnermann, Jens Limpert

Proceedings Volume 11981, 119810E (2022) https://doi.org/10.1117/12.2609380

KEYWORDS: Femtosecond phenomena, Reflectivity, Fiber amplifiers, Beam splitters, Polarization, Mirrors, Fiber lasers, Wave plates, Laser systems engineering, Structured optical fibers

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Proceedings Article | 4 March 2022 Presentation

Anti-Stokes fluorescence cooling of ytterbium doped silica glass for radiation-balanced fiber lasers

Proceedings Volume PC11981, PC119810N (2022) https://doi.org/10.1117/12.2615241

KEYWORDS: Fiber lasers, Silica, Ytterbium, Luminescence, Glasses

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Proceedings Article | 5 March 2021 Presentation

Anti-Stokes fluorescence cooling of a Yb-doped silica glass preform using a high-power laser

Esmaeil Mobini, Saeid Rostami, Mostafa Peysokhan, Alexander Albrecht, Stefan Kuhn, Sigrun Hein, Christian Hupel, Johannes Nold, Nicoletta Haarlammert, Thomas Schreiber, Ramona Eberhardt, Angel Flores, Andreas Tünnermann, Mansoor Sheik-Bahae, Arash Mafi

Proceedings Volume 11702, 1170208 (2021) https://doi.org/10.1117/12.2579925

KEYWORDS: Silica, Glasses, Luminescence, High power lasers, Optical fibers, Optical amplifiers, High power fiber amplifiers, Absorption, High power fiber lasers, Fiber lasers

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Proceedings Article | 9 March 2020 Presentation

Observation of anti-Stokes fluorescence cooling of ytterbium-doped silica glass (Conference Presentation)

Proceedings Volume 11298, 112980G (2020) https://doi.org/10.1117/12.2545233

KEYWORDS: Luminescence, Silica, Glasses, Fiber amplifiers, Optical amplifiers, Fiber lasers, Laser damage threshold, High power lasers, High power fiber amplifiers, ZBLAN

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Proceedings Article | 21 February 2020 Presentation + Paper

Analysis of fabrication techniques and material systems for kW fibers limited by TMI

Nicoletta Haarlammert, Stefan Kuhn, Christian Hupel, Johannes Nold, Steffen Schulze, Friedrich Möller, Victor Distler, Maximilian Strecker, Gonzalo Palma-Vega, Sigrun Hein, Denny Häßner, Till Walbaum, Thomas Schreiber, Ramona Eberhardt, Andreas Tünnermann

Proceedings Volume 11260, 1126026 (2020) https://doi.org/10.1117/12.2546714

KEYWORDS: High power fiber amplifiers, Single mode fibers, Cerium, Ytterbium, Optical fibers, Absorption, Doping, Fabrication, Fiber lasers, Aluminum, Refractive index, Signal attenuation, Amplifiers

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Proceedings Article | 27 February 2019 Paper

High-power fiber laser materials: influence of fabrication methods and codopants on optical properties

S. Kuhn, S. Hein, C. Hupel, J. Nold, F. Stutzki, N. Haarlammert, T. Schreiber, R. Eberhardt, A. Tünnermann

Proceedings Volume 10914, 1091405 (2019) https://doi.org/10.1117/12.2509609

KEYWORDS: Aluminum, Ytterbium, Doping, Signal attenuation, Refractive index, Fabrication, Absorption, Silica, High power fiber lasers, Optical properties

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Proceedings Article | 14 March 2018 Presentation

TMI-threshold investigations of low NA Yb-doped single mode fibers (Conference Presentation)

Franz Beier, Friedrich Möller, Johannes Nold, Bettina Sattler, Stefan Kuhn, Christian Hupel, Sigrun Hein, Andreas Liem, Nicoletta Haarlammert, Thomas Schreiber, Ramona Eberhardt, Andreas Tünnermann

Proceedings Volume 10512, 1051203 (2018) https://doi.org/10.1117/12.2287699

KEYWORDS: Fiber amplifiers, Absorption, Single mode fibers, Thermal effects, Fiber lasers, Solid state lasers, Ytterbium, Manufacturing

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Proceedings Article | 22 February 2018 Paper

Active materials for high-power fiber lasers prepared by all-solution doping technique

Stefan Kuhn, Friedrich Möller, Christian Hupel, Sigrun Hein, Franz Beier, Johannes Nold, Nicoletta Haarlammert, Thomas Schreiber, Ramona Eberhardt, Andreas Tünnermann

Proceedings Volume 10528, 1052809 (2018) https://doi.org/10.1117/12.2287119

KEYWORDS: Ytterbium, Aluminum, Refractive index, Doping, Absorption, Boron, Luminescence, Signal attenuation, Phosphorus, High power fiber lasers

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Proceedings Article | 21 April 2017 Presentation

Single mode low-NA step index Yb-doped fiber design for output powers beyond 4kW (Conference Presentation)

Franz Beier, Fritz Proske, Christian Hupel, Stefan Kuhn, Sigrun Hein, Bettina Sattler, Johannes Nold, Nicoletta Haarlammert, Thomas Schreiber, Ramona Eberhardt, Andreas Tünnermann

Proceedings Volume 10083, 100830Z (2017) https://doi.org/10.1117/12.2256038

KEYWORDS: Fiber amplifiers, Solid state lasers, Single mode fibers, Manufacturing, Fabrication, Doping, Step index fibers, High power fiber amplifiers, Amplifiers, Fiber lasers

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Showing 5 of 12 publications

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