Prof. Hartmut Bartelt Profile

Prof. Hartmut Bartelt

Professor/Dept Head at Leibniz-Institut für Photonische Technologien eV

SPIE Involvement:

Author

Publications (129)

Proceedings Article | 3 October 2019 Paper

Enhanced temperature sensing with Vernier effect on fiber probe based on multimode Fabry-Perot interferometer

André Gomes, Martin Becker, Jan Dellith, Mohammad Zibaii, Hamid Latifi, Manfred Rothhardt, Hartmut Bartelt, Orlando Frazão

Proc. SPIE. 11207, Fourth International Conference on Applications of Optics and Photonics

KEYWORDS: Multimode fibers, Optical fibers, Superposition, Biosensing, Fabry–Perot interferometry, Interferometers, Sensors, Temperature sensors

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Proceedings Article | 3 October 2019 Paper

In-plane wavelength multiplexing of fibre Bragg gratings in a multicore optical fibre

Ravil Idrisov, Manfred Rothhardt, Hartmut Bartelt

Proc. SPIE. 11207, Fourth International Conference on Applications of Optics and Photonics

KEYWORDS: Optical fibers, Refractive index, Optical sensors, Fiber Bragg gratings, Sensors, Spectroscopy, Wavelength division multiplexing, Multiplexing, Structured optical fibers, Telecommunications

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Proceedings Article | 9 September 2019 Paper

Flexible tuning concept for fiber-integrated lasers featuring multi-wavelength emission with fast switching speeds for DIAL

Tobias Tiess, Martin Becker, Manfred Rothhardt, Hartmut Bartelt, Matthias Jäger

Proc. SPIE. 11127, Earth Observing Systems XXIV

KEYWORDS: Optical filters, Switching, Resonators, Fiber Bragg gratings, LIDAR, Molecules, Modulators, Fiber lasers, Pulsed laser operation, Absorption

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Proceedings Article | 27 February 2019 Presentation + Paper

Novel approach for high-performance optical fibers: multiple-doped silica powders with plasma-enhanced processes

T. Trautvetter, H. Baierl, V. Reichel, A. Scheffel, J. Dellith, D. Köpp, F. Hempel, M. Baeva, R. Methling, R. Foest, L. Wondraczek, K. Wondraczek, H. Bartelt

Proc. SPIE. 10914, Optical Components and Materials XVI

KEYWORDS: Optical fibers, Atmospheric plasma, Silica, Waveguides, Glasses, Oxygen, Ytterbium, Aluminum, Microwave radiation, Plasma

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Proceedings Article | 18 August 2018 Presentation + Paper

Multi-path interferometer structures with cleaved silica microspheres

André Gomes, Beatriz Silveira, Fatemeh Karami, Mohammad Zibaii, Hamid Latifi, Jan Dellith, Martin Becker, Manfred Rothhardt, Hartmut Bartelt, Orlando Frazão

Proc. SPIE. 10749, Interferometry XIX

KEYWORDS: Multimode fibers, Modulation, Silica, Interferometers, Fourier transforms, Interferometry, Fiber optics sensors, Ion beams, Temperature metrology

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Proceedings Article | 17 May 2018 Paper

Raman-based cw supercontinuum generation in a fiber ring laser with low-output coupling

Muhammad Assad Arshad, Alexander Hartung, Mikaёl Leduc, Nicolas Godbout, Hartmut Bartelt, Matthias Jäger

Proc. SPIE. 10683, Fiber Lasers and Glass Photonics: Materials through Applications

KEYWORDS: Continuous wave operation, Signal attenuation, Dispersion, Fiber lasers, Semiconductor lasers, Wave propagation, Diodes, Raman scattering, Supercontinuum generation, Feedback signals

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Proceedings Article | 14 March 2018 Presentation

Laser beam quality improvement of REPUSIL-based rod amplifier with local short adiabatic taper (Conference Presentation)

Yuan Zhu, Martin Lorenz, Tina Eschrich, Martin Leich, Claudia Aichele, Jens Kobelke, Hartmut Bartelt, Matthias Jäger

Proc. SPIE. 10512, Fiber Lasers XV: Technology and Systems

KEYWORDS: Multimode fibers, Fiber amplifiers, Diffusion, Laser processing, Amplifiers, Fiber lasers, Tapered optical fibers

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Proceedings Article | 23 April 2017 Paper

Multi-wavelength reflection spectra from an acousto-optic modulated fiber Bragg grating in a highly birefringent suspended core fiber

Ricardo Silva, Martin Becker, Manfred Rothhardt, Hartmut Bartelt, Alexandre A. Pohl

Proc. SPIE. 10323, 25th International Conference on Optical Fiber Sensors

KEYWORDS: Optical filters, Ferroelectric materials, Modulation, Polarization, Fiber Bragg gratings, Reflectivity, Single mode fibers, Fiber lasers, Acoustics, Acousto-optics

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Proceedings Article | 21 April 2017 Presentation

Tunable Yb-doped fiber laser based on a FBG array and a theta ring resonator ensuring a constant repetition rate (Conference Presentation)

Tobias Tiess, Martin Becker, Manfred Rothhardt, Hartmut Bartelt, Matthias Jäger

Proc. SPIE. 10083, Fiber Lasers XIV: Technology and Systems

KEYWORDS: Optical filters, Tunable lasers, Resonators, Fiber Bragg gratings, Spectroscopy, Laser applications, Laser development, Fiber lasers, Electronic filtering, Pulsed laser operation

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Proceedings Article | 24 November 2016 Paper

Ultra-small Fabry-Perot cavities in tapered optical fibers

Stephen Warren-Smith, Ricardo André, Jan Dellith, Hartmut Bartelt

Proc. SPIE. 10013, SPIE BioPhotonics Australasia

KEYWORDS: Optical fibers, Refractive index, Fabry–Perot interferometers, Reflection, Interferometers, Sensors, Water, Fiber optics sensors, Ion beams, Tapered optical fibers

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Proceedings Article | 15 September 2016 Presentation + Paper

Tapered optical fiber tip probes based on focused ion beam-milled Fabry-Perot microcavities

Ricardo André, Stephen Warren-Smith, Martin Becker, Jan Dellith, Manfred Rothhardt, M. Zibaii, H. Latifi, Manuel B. Marques, Hartmut Bartelt, Orlando Frazão

Proc. SPIE. 9927, Nanoengineering: Fabrication, Properties, Optics, and Devices XIII

KEYWORDS: Refractive index, Fabry–Perot interferometers, Silica, Water, Ions, Ion beams, Solids, Tapered optical fibers, Wet etching, Optical microcavities

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SPIE Journal Paper | 13 June 2016

Discretely tunable thulium-doped fiber-based polarization-maintaining master oscillator power amplifier using fiber Bragg grating arrays as spectral filters

Tobias Tiess, Saher Junaid, Martin Becker, Manfred Rothhardt, Hartmut Bartelt, Matthias Jäger

OE Vol. 55 Issue 06

KEYWORDS: Fiber Bragg gratings, Optical filters, Oscillators, Fiber lasers, Phase modulation, Optical amplifiers, Polarization, Fiber amplifiers, Amplifiers, Tunable lasers

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Proceedings Article | 30 May 2016 Paper

Fiber probe microcavities for refractive index and temperature discrimination

Ricardo André, Stephen Warren-Smith, Martin Becker, Jan Dellith, Manfred Rothhardt, M. Zibaii, H. Latifi, Manuel Marques, Hartmut Bartelt, Orlando Frazão

Proc. SPIE. 9916, Sixth European Workshop on Optical Fibre Sensors

KEYWORDS: Refractive index, Fabry–Perot interferometry, Silica, Sensors, Water, Ions, Fourier transforms, Structured optical fibers, Fiber optics sensors, Ion beams, Electronic filtering, Laser beam diagnostics, Optical microcavities, Bandpass filters

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Proceedings Article | 29 April 2016 Paper

Multiplexed refractive index-based sensing using optical fiber microcavities

Stephen Warren-Smith, Ricardo André, Jan Dellith, Hartmut Bartelt

Proc. SPIE. 9899, Optical Sensing and Detection IV

KEYWORDS: Optical fibers, Refractive index, Fabry–Perot interferometers, Optical sensing, Reflection, Sensors, Coating, Fourier transforms, Interferometry, Bioalcohols, Multiplexing, Fiber optics sensors, Ion beams

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Proceedings Article | 9 March 2016 Paper

Discretely tunable Tm-doped fiber-based MOPA using FBG arrays as spectral filters

T. Tiess, S. Junaid, M. Becker, M. Rothhardt, H. Bartelt, M. Jäger

Proc. SPIE. 9728, Fiber Lasers XIII: Technology, Systems, and Applications

KEYWORDS: Optical filters, Light sources, Tunable lasers, Oscillators, Biomedical optics, Phase modulation, Fiber Bragg gratings, Materials processing, Amplifiers, Modulators, Fiber lasers, Thulium, YAG lasers, Pulsed laser operation, Absorption

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Proceedings Article | 28 September 2015 Paper

All-fiber laser mode-locked by the acousto-optic modulation of a fiber Bragg grating in suspended core fiber

Ricardo Silva, Tobias Tiess, Martin Becker, Tina Eschrich, Manfred Rothhardt, Matthias Jäger, Alexandre Pohl, Hartmut Bartelt

Proc. SPIE. 9634, 24th International Conference on Optical Fibre Sensors

KEYWORDS: Ferroelectric materials, Modulation, Fiber Bragg gratings, Mode locking, Modulators, Fiber lasers, Picosecond phenomena, Bragg cells, Acoustics, Acousto-optics

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Proceedings Article | 28 September 2015 Paper

Birefringence properties of a polarization maintaining Panda fibre during Bragg grating regeneration

Leonhard Polz, Andreas Jarsen, Hartmut Bartelt, Johannes Roths

Proc. SPIE. 9634, 24th International Conference on Optical Fibre Sensors

KEYWORDS: Refractive index, Phase modulation, Polarization, Birefringence, Polarization maintaining fibers, Fiber Bragg gratings, Annealing, Hydrogen, Boron, Temperature metrology

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Proceedings Article | 28 September 2015 Paper

Bragg grating fabrication on tapered fiber tips based on focused ion beam milling

Ricardo André, Martin Becker, Jan Dellith, Manfred Rothhardt, M. Zibaii, H. Latifi, Manuel Marques, Hartmut Bartelt, Orlando Frazão

Proc. SPIE. 9634, 24th International Conference on Optical Fibre Sensors

KEYWORDS: Refractive index, Modulation, Silica, Fiber Bragg gratings, Sensors, Bioalcohols, Structured optical fibers, Scanning electron microscopy, Ion beams, Temperature metrology

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Proceedings Article | 28 September 2015 Paper

Fiber Bragg grating inscription in optical multicore fibers

Martin Becker, Tino Elsmann, Adrian Lorenz, Ron Spittel, Jens Kobelke, Kay Schuster, Manfred Rothhardt, Ines Latka, Sebastian Dochow, Hartmut Bartelt

Proc. SPIE. 9634, 24th International Conference on Optical Fibre Sensors

KEYWORDS: Multimode fibers, Optical filters, Refractive index, Biomedical optics, Modulation, Waveguides, Fiber Bragg gratings, Manufacturing, Single mode fibers, Fiber lasers

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Proceedings Article | 1 July 2015 Paper

Optical Bragg grating sensor fibers for ultra-high temperature applications

Hartmut Bartelt, Tino Elsmann, Tobias Habisreuther, Kay Schuster, Manfred Rothhardt

Proc. SPIE. 9655, Fifth Asia-Pacific Optical Sensors Conference

KEYWORDS: Optical fibers, Optical sensors, Modulation, Fiber Bragg gratings, Sensors, Glasses, Crystals, Reflectivity, Sapphire, Chemical elements

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Proceedings Article | 16 March 2015 Paper

The REPUSIL process and the capability of fluorine doping for the adjustment of optical and thermochemical properties in silica materials

K. Schuster, St. Grimm, A. Kalide, Jan Dellith, M. Leich, A. Schwuchow, S. Unger, A. Langner, G. Schötz, H. Bartelt

Proc. SPIE. 9359, Optical Components and Materials XII

KEYWORDS: Thermography, Refractive index, Silica, Cladding, Glasses, Ions, Doping, Ytterbium, Aluminum, Fluorine

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Proceedings Article | 4 March 2015 Paper

Electrically tunable fiber-integrated Yb-doped laser covering 74 nm based on a fiber Bragg grating array

T. Tiess, M. Rothhardt, C. Chojetzki, M. Jäger, H. Bartelt

Proc. SPIE. 9344, Fiber Lasers XII: Technology, Systems, and Applications

KEYWORDS: Optical filters, Tunable lasers, Modulation, Resonators, Fiber Bragg gratings, Reflectivity, Fiber lasers, Ytterbium, Spectral resolution, Pulsed laser operation

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Proceedings Article | 4 March 2015 Paper

High peak power amplification in large-core all-solid Yb fibers with an index-elevated pump clad and a low numerical aperture core

M. Leich, Wenbin He, S. Grimm, J. Kobelke, Yuan Zhu, B. Müller, Jörg Bierlich, H. Bartelt, M. Jäger

Proc. SPIE. 9344, Fiber Lasers XII: Technology, Systems, and Applications

KEYWORDS: Optical fibers, Fiber amplifiers, Refractive index, Cladding, Signal attenuation, Amplifiers, Ytterbium, Aluminum, Raman scattering, Absorption

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Proceedings Article | 20 February 2015 Paper

Demonstration of >5kW emissions with good beam quality from two different 7:1 all-glass fiber coupler-types

M. Plötner, T. Eschrich, O. de Vries, J. Kobelke, S. Unger, M. Jäger, T. Schreiber, H. Bartelt, R. Eberhardt, A. Tünnermann

Proc. SPIE. 9346, Components and Packaging for Laser Systems

KEYWORDS: Multimode fibers, Step index fibers, Fiber optics, Cladding, Capillaries, Silicon, Single mode fibers, Fiber lasers, Fiber couplers, Precision optics

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SPIE Journal Paper | 3 June 2014

Length distributed measurement of temperature effects in Yb-doped fibers during pumping

Martin Leich, Julia Fiebrandt, Anka Schwuchow, Sylvia Jetschke, Sonja Unger, Matthias Jäger, Manfred Rothhardt, Hartmut Bartelt

OE Vol. 53 Issue 06

KEYWORDS: Optical fibers, Fiber Bragg gratings, Temperature metrology, Ytterbium, Absorption, Ultraviolet radiation, Cerium, Fiber lasers, Optical pumping, Hydrogen

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Proceedings Article | 2 June 2014 Paper

Analysis of the air holes' geometry influence on longitudinal strain sensitivity of microstructured fiber Bragg gratings

T. Tenderenda, K. Stepien, L. Szostkiewicz, M. Murawski, M. Szymanski, M. Becker, M. Rothhardt, H. Bartelt, P. Mergo, K. Poturaj, K. Skorupski, P. Marć, L. Jaroszewicz, T. Nasilowski

Proc. SPIE. 9157, 23rd International Conference on Optical Fibre Sensors

KEYWORDS: Refractive index, Femtosecond phenomena, Fiber Bragg gratings, Cladding, Sensors, Germanium, Structured optical fibers, Wave propagation, Fiber characterization, Micro optical fluidics

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Proceedings Article | 2 June 2014 Paper

First order fiber Bragg grating inscription with femtosecond laser and reflection wavelengths from visible to infrared

Martin Becker, Tino Elsmann, Anka Schwuchow, Manfred Rothhardt, Sebastian Dochow, Hartmut Bartelt

Proc. SPIE. 9157, 23rd International Conference on Optical Fibre Sensors

KEYWORDS: Optical fibers, Visible radiation, Femtosecond phenomena, Fiber Bragg gratings, Reflection, Ultraviolet radiation, Fiber lasers, Infrared radiation, Erbium, Erbium lasers

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Proceedings Article | 2 June 2014 Paper

Regeneration experiments with fibre Bragg gratings in hydrogen out-diffused fibres

Leonhard Polz, Andreas Dörfler, Hartmut Bartelt, Johannes Roths

Proc. SPIE. 9157, 23rd International Conference on Optical Fibre Sensors

KEYWORDS: Optical fibers, Fiber Bragg gratings, Cladding, Chemical species, Glasses, Ultraviolet radiation, Molecules, Hydrogen, Diffusion, Reflectivity

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Proceedings Article | 2 June 2014 Paper

Optical fiber Fabry-Pérot sensor fabrication based on focused ion beam post-processing

Ricardo Andre, Simon Pevec, Martin Becker, Jan Dellith, Manfred Rothhardt, Manuel Marques, Denis Donlagic, Hartmut Bartelt, Orlando Frazão

Proc. SPIE. 9157, 23rd International Conference on Optical Fibre Sensors

KEYWORDS: Optical fibers, Silica, Sensors, Etching, Glasses, Structured optical fibers, Fiber optics sensors, Scanning electron microscopy, Ion beams, Wet etching

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Proceedings Article | 2 June 2014 Paper

Advanced fabrication and calibration of high-temperature sensor elements based on sapphire fiber Bragg gratings

Tino Elsmann, Tobias Habisreuther, Manfred Rothhardt, Reinhardt Willsch, Hartmut Bartelt

Proc. SPIE. 9157, 23rd International Conference on Optical Fibre Sensors

KEYWORDS: Fabrication, Silica, Fiber Bragg gratings, Sensors, Calibration, Crystals, Fiber optics sensors, Sapphire, Sensor calibration, Temperature metrology

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Proceedings Article | 2 June 2014 Paper

Miniaturized total temperature probe based on fibre Bragg gratings

Leonhard Polz, Tasja Berghaus, Markus Klose, Andreas Zeisberger, Hartmut Bartelt, Johannes Roths

Proc. SPIE. 9157, 23rd International Conference on Optical Fibre Sensors

KEYWORDS: Fiber Bragg gratings, Sensors, Distortion, Fiber optics sensors, Transmission electron microscopy, Transducers, Temperature sensors, Spatial resolution, Environmental sensing, Temperature metrology

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Proceedings Article | 2 May 2014 Paper

Fiber Bragg grating inscription in novel highly strains sensitive microstructured fiber

K. Stepien, T. Tenderenda, M. Murawski, M. Szymanski, L. Szostkiewicz, M. Becker, M. Rothhardt, H. Bartelt, P. Mergo, K. Poturaj, L. Jaroszewicz, T. Nasilowski

Proc. SPIE. 9128, Micro-structured and Specialty Optical Fibres III

KEYWORDS: Refractive index, Polishing, Femtosecond phenomena, Silica, Fiber Bragg gratings, Spectroscopy, Doping, Structured optical fibers, Micro optical fluidics, Temperature metrology

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Proceedings Article | 7 March 2014 Paper

Investigation of a large core 976nm Yb fiber laser for high brightness fiber-based pump sources

Martin Leich, Matthias Jäger, Stephan Grimm, Jan Dellith, Denny Hoh, Sylvia Jetschke, Martin Becker, Alexander Hartung, Tina Eschrich, Jens Kobelke, Hartmut Bartelt

Proc. SPIE. 8961, Fiber Lasers XI: Technology, Systems, and Applications

KEYWORDS: Refractive index, Resonators, Fiber Bragg gratings, Glasses, Fiber lasers, Semiconductor lasers, Laser resonators, Ytterbium, Diodes, Fiber couplers

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Proceedings Article | 7 March 2014 Paper

Longitudinal strain sensing with photonic crystal fibers and fiber Bragg gratings

T. Tenderenda, M. Murawski, M. Szymanski, L. Szostkiewicz, M. Becker, M. Rothhardt, H. Bartelt, P. Mergo, Kl Poturaj, M. Makara, K. Skorupski, P. Marc, L. Jaroszewicz, T. Nasilowski

Proc. SPIE. 8982, Optical Components and Materials XI

KEYWORDS: Refractive index, Light sources, Photonic crystal fibers, Femtosecond phenomena, Fiber Bragg gratings, Sensors, Dispersion, Structured optical fibers, Numerical analysis, Head

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Proceedings Article | 7 March 2014 Paper

Spatially resolved in-core temperature measurement in rare-earth doped fibers during pumping

Julia Fiebrandt, Martin Leich, Sonja Unger, Anka Schwuchow, Matthias Jäger, Manfred Rothhardt, Hartmut Bartelt

Proc. SPIE. 8982, Optical Components and Materials XI

KEYWORDS: Fabrication, Optical fibers, Fiber amplifiers, Near infrared, Fiber Bragg gratings, Fiber lasers, Optical pumping, Cerium, Temperature metrology, Absorption

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Proceedings Article | 18 November 2013 Paper

Study of temperature sensor fiber with high germanium doped core

F. Fávero, M. Becker, R. Spittel, M. Rothhardt, J. Kobelke, H. Bartelt

Proc. SPIE. 8785, 8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications

KEYWORDS: Refractive index, Fiber Bragg gratings, Interferometers, Cladding, Sensors, Germanium, Single mode fibers, Fiber optics sensors, Temperature sensors, Temperature metrology

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Proceedings Article | 18 November 2013 Paper

Laser processed preforms for microstructured optical fibers

Martin Becker, Marcel Werner, Oliver Fitzau, Dominik Esser, Jens Kobelke, Kay Schuster, Adrian Lorenz, Anka Schwuchow, Manfred Rothhardt, Dieter Hoffmann, Hartmut Bartelt

Proc. SPIE. 8785, 8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications

KEYWORDS: Silica, Fiber Bragg gratings, Signal attenuation, Glasses, Laser applications, Laser drilling, Structured optical fibers, Fiber lasers, Micro optical fluidics, Absorption

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Proceedings Article | 15 October 2013 Paper

All-fiber time-delay spectrometer based on an array of fiber Bragg gratings

T. Tiess, M. Rothhardt, M. Jäger, H. Bartelt

Proc. SPIE. 8924, Fourth Asia Pacific Optical Sensors Conference

KEYWORDS: Fiber optics, Fiber Bragg gratings, Sensors, Spectroscopy, Reflectivity, Photodiodes, Temporal resolution, Spectral resolution, Oscilloscopes, Pulsed laser operation

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SPIE Journal Paper | 8 July 2013

High birefringence triangular optical nanowire in suspended-core fiber for temperature sensing

Ricardo Andre, Martin Becker, Kay Schuster, Manfred Rothhardt, Hartmut Bartelt, Manuel Marques, Orlando Frazão

JNP Vol. 7 Issue 01

KEYWORDS: Birefringence, Sagnac interferometers, Optical fibers, Sensors, Polarization, Silica, Structured optical fibers, Single mode fibers, Cladding, Nanowires

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