Dr. Denny Hässner Profile

Dr. Denny Hässner

at Fraunhofer-IOF

SPIE Involvement:

Author

Publications (9)

Proceedings Article | 12 March 2024 Paper

NA-dependent absorption in double clad multicore amplifier fibers

Benjamin Yildiz, Denny Häßner, Stefan Kuhn, Till Walbaum, Nicoletta Haarlammert, Thomas Schreiber

Proceedings Volume 12865, 1286510 (2024) https://doi.org/10.1117/12.3002478

KEYWORDS: Absorption, Multicore fiber, Cladding, Light absorption, Fiber amplifiers, Near field, Cameras, Sodium, Iris, Whispering gallery modes

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Proceedings Article | 12 March 2024 Paper

Mitigation of transverse mode instability by polarization rotation in high-power PM fiber amplifiers

Gonzalo Palma-Vega, Denny Hässner, Stefan Kuhn, Johannes Nold, Friedrich Möller, César Jáuregui, Andreas Tünnermann, Jens Limpert, Nicoletta Haarlammert, Thomas Schreiber

Proceedings Volume 12865, 1286504 (2024) https://doi.org/10.1117/12.3001675

KEYWORDS: Transverse mode instability, Polarization, Fiber amplifiers, Birefringence, Refractive index

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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 2023 Presentation

High-speed mode-resolved polarization measurements in TMI-limited Yb-doped fiber amplifiers

Friedrich Möller, Florian Grimm, Gonzalo Palma-Vega, Denny Häßner, Victor Distler, Till Walbaum, Thomas Schreiber

Proceedings Volume 12400, 124000T (2023) https://doi.org/10.1117/12.2650149

KEYWORDS: Polarization, Fiber amplifiers, High speed cameras, Beam splitters, Temporal resolution, Reconstruction algorithms, Polarization analysis, Photodiodes, Oscilloscopes, Linear polarizers

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Proceedings Article | 8 March 2023 Presentation + Paper

Mitigation of transverse mode instability in large mode area polarization maintaining fibers

Gonzalo Palma-Vega, Denny Hässner, Stefan Kuhn, Friedrich Möller, César Jáuregui, Nicoletta Haarlammert, Thomas Schreiber

Proceedings Volume 12400, 124000U (2023) https://doi.org/10.1117/12.2650342

KEYWORDS: Transverse mode instability, Polarization, Refractive index, Fiber amplifiers, Photodiodes, Polarization maintaining fibers, Wave plates, Signal attenuation, Frequency modulation, Fiber lasers

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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

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 | 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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Showing 5 of 9 publications

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