Dr. Manfred Rothhardt Profile

Dr. Manfred Rothhardt

Scientist at Leibniz-Institut für Photonische Technologien eV

SPIE Involvement:

Author

Publications (77)

Proceedings Article | 18 April 2021 Presentation + Paper

Ultra-compact acousto-optic modulator of a fibre Bragg grating in a highly birefringent suspended core fibre

Ricardo da Silva, Egor Manuylovich, Namita Sahoo, Martin Becker, Manfred Rothhardt, Hartmut Bartelt, David Webb

Proceedings Volume 11773, 117730U (2021) https://doi.org/10.1117/12.2592228

KEYWORDS: Fiber Bragg gratings, Modulation, Ferroelectric materials, Acousto-optics, Modulators, Bragg cells, Silica, Acoustics, Single mode fibers, Pulsed laser operation

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Proceedings Article | 14 April 2020 Presentation + Paper

Tunable fiber laser concepts in the 2µm spectral range for tunable dual wavelength emission

Tobias Tiess, Alexander Hartung, Martin Becker, Manfred Rothhardt, Romain Dauliat, Baptiste Leconte, Georges Humbert, Philippe Roy, Matthias Jäger

Proceedings Volume 11357, 1135714 (2020) https://doi.org/10.1117/12.2559948

KEYWORDS: Fiber lasers, Fiber Bragg gratings, Four wave mixing, Terahertz radiation, Q switching, Bragg cells, Optical amplifiers, Thulium, Tunable lasers, Fiber amplifiers

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Proceedings Article | 1 April 2020 Presentation

Optical fiber device for simultaneous manometry, pH-metry and bilimetry in esophagus (OPTIMO) (Conference Presentation)

Francesco Chiavaioli, Giovanni Bartolozzi, Manfred Rothhardt, Kerstin Schroeder, Tobias Habisreuther, Martin Hahn, Olivier Rados, Florian Mönkediek, Steffen Görlich, Johannes Gäbler, Antonio Taddei, Maria Novella Ringressi, Ilenia Bartolini, Piero Cecchi, Francesco Baldini

Proceedings Volume 11361, 113610U (2020) https://doi.org/10.1117/12.2555710

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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

Proceedings Volume 11207, 112071I (2019) https://doi.org/10.1117/12.2527399

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

Proceedings Volume 11207, 112072O (2019) https://doi.org/10.1117/12.2530812

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

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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

Proceedings Volume 11127, 111272D (2019) https://doi.org/10.1117/12.2529150

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

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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

Proceedings Volume 10749, 107490O (2018) https://doi.org/10.1117/12.2319082

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

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Proceedings Article | 16 May 2017 Presentation + Paper

Fiber Bragg filters For laser- and multicore fibers

Martin Becker, Tino Elsmann, Adrian Lorenz, Manfred Rothhardt

Proceedings Volume 10232, 1023207 (2017) https://doi.org/10.1117/12.2267236

KEYWORDS: Hydrogen, Absorption, Reflection, Optical fibers, Fiber Bragg gratings, Fiber lasers, Information security, Optical filters, Structured optical fibers, Structural health monitoring, Biomedical optics, Germanium, Single mode fibers, Light harvesting

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Proceedings Article | 23 April 2017 Paper

Combined microfiber knot resonator and focused ion beam-milled Mach-Zehnder interferometer for refractive index measurement

André Gomes, Ricardo André, Stephen Warren-Smith, Jan Dellith, Martin Becker, Manfred Rothhardt, Orlando Frazão

Proceedings Volume 10323, 1032340 (2017) https://doi.org/10.1117/12.2265387

KEYWORDS: Scanning electron microscopy, Resonators, Refractive index, Sensors, Mach-Zehnder interferometers, Ion beams, Ions, Visible radiation, Modulation, Temperature metrology

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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

Proceedings Volume 10323, 103238P (2017) https://doi.org/10.1117/12.2265696

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

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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

Proceedings Volume 10083, 100831D (2017) https://doi.org/10.1117/12.2250315

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

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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

Proceedings Volume 9927, 99270R (2016) https://doi.org/10.1117/12.2236321

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

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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, 064106, (June 2016) https://doi.org/10.1117/12.10.1117/1.OE.55.6.064106

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

Proceedings Volume 9916, 991616 (2016) https://doi.org/10.1117/12.2236009

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

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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

Proceedings Volume 9728, 97280N (2016) https://doi.org/10.1117/12.2212485

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

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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

Proceedings Volume 9634, 96343I (2015) https://doi.org/10.1117/12.2194978

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

Proceedings Volume 9634, 96343C (2015) https://doi.org/10.1117/12.2194829

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

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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

Proceedings Volume 9634, 963420 (2015) https://doi.org/10.1117/12.2194929

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

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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

Proceedings Volume 9655, 96552S (2015) https://doi.org/10.1117/12.2185623

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

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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

Proceedings Volume 9344, 93440G (2015) https://doi.org/10.1117/12.2077707

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

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SPIE Journal Paper | 3 June 2014 Open Access

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, 066101, (June 2014) https://doi.org/10.1117/12.10.1117/1.OE.53.6.066101

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

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

Proceedings Volume 9157, 91572N (2014) https://doi.org/10.1117/12.2059182

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

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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

Proceedings Volume 9157, 91572T (2014) https://doi.org/10.1117/12.2059289

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

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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

Proceedings Volume 9157, 91577T (2014) https://doi.org/10.1117/12.2059175

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

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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

Proceedings Volume 9157, 91578M (2014) https://doi.org/10.1117/12.2059652

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

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Proceedings Article | 15 May 2014 Paper

Trends and future of fiber Bragg grating sensing technologies: tailored draw tower gratings (DTGs)

E. Lindner, A. Hartung, D. Hoh, C. Chojetzki, K. Schuster, J. Bierlich, M. Rothhardt

Proceedings Volume 9141, 91410X (2014) https://doi.org/10.1117/12.2060073

KEYWORDS: Fiber Bragg gratings, Sensors, Optical fibers, Temperature metrology, Ultraviolet radiation, Reflection, Refractive index, Fiber coatings, Copper, Telecommunications

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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

Proceedings Volume 9128, 91280E (2014) https://doi.org/10.1117/12.2051315

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

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Proceedings Article | 7 March 2014 Paper

All-fiber Raman oscillator for the generation of radially and azimuthally polarized beams

Christoph Jocher, Cesar Jauregui, Martin Becker, Manfred Rothhardt, Jens Limpert, Andreas Tünnermann

Proceedings Volume 8961, 896122 (2014) https://doi.org/10.1117/12.2039807

KEYWORDS: Polarization, Raman spectroscopy, Oscillators, Fiber Bragg gratings, Optical filters, Waveguides, Raman scattering, Structured optical fibers, Beam shaping, Refractive index

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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

Proceedings Volume 8982, 898219 (2014) https://doi.org/10.1117/12.2038387

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

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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

Proceedings Volume 8982, 898206 (2014) https://doi.org/10.1117/12.2037663

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

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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

Proceedings Volume 8785, 8785CC (2013) https://doi.org/10.1117/12.2026158

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

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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

Proceedings Volume 8785, 8785C9 (2013) https://doi.org/10.1117/12.2023223

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

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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

Proceedings Volume 8924, 89243B (2013) https://doi.org/10.1117/12.2031733

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

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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, 073088, (July 2013) https://doi.org/10.1117/12.10.1117/1.JNP.7.073088

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

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Proceedings Article | 20 May 2013 Paper

Analysis of temperature and strain sensitivity of fiber Bragg gratings written in dual-mode highly birefringent microstructured fibers

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

Proceedings Volume 8794, 879427 (2013) https://doi.org/10.1117/12.2025713

KEYWORDS: Fiber Bragg gratings, Polarimetry, Fiber optics sensors, Cladding, Temperature metrology, Birefringence, Fiber optics, Visible radiation, Neodymium, Structured optical fibers

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Proceedings Article | 20 May 2013 Paper

Optical sapphire fiber Bragg gratings as high temperature sensors

Tobias Habisreuther, Tino Elsmann, Zhiwen Pan, Albrecht Graf, Hans-Joachim Pißler, Manfred Rothhardt, Reinhardt Willsch, Hartmut Bartelt, Markus Schmidt

Proceedings Volume 8794, 87940B (2013) https://doi.org/10.1117/12.2026074

KEYWORDS: Sapphire, Fiber Bragg gratings, Temperature metrology, Sensors, Silica, Temperature sensors, Crystals, Electromagnetism, Argon, Fiber optics sensors

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Proceedings Article | 20 May 2013 Paper

HiBi triangular optical nanowire in suspended-core fiber for sensing applications

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

Proceedings Volume 8794, 87940I (2013) https://doi.org/10.1117/12.2025404

KEYWORDS: Birefringence, Mirrors, Polarization, Interferometers, Spectrum analysis, Nanolithography, Optical fibers, Reflectivity, Temperature metrology, Nanowires

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Proceedings Article | 3 May 2013 Paper

PCF interferometer based temperature sensor with high sensitivity

F. Favero, R. Spittel, M. Rothhardt, J. Kobelke, H. Bartelt

Proceedings Volume 8774, 87741S (2013) https://doi.org/10.1117/12.2017325

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

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Proceedings Article | 3 May 2013 Paper

Inscription of first order fiber Bragg gratings in sapphire fibers by 400 nm femtosecond laser pulses

Tino Elsmann, Tobias Habisreuther, Albrecht Graf, Manfred Rothhardt, Hartmut Bartelt

Proceedings Volume 8774, 877406 (2013) https://doi.org/10.1117/12.2016919

KEYWORDS: Fiber Bragg gratings, Sapphire, Sensors, Femtosecond phenomena, Multiplexing, Crystals, Temperature sensors, Refractive index, Temperature metrology, Laser systems engineering

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Proceedings Article | 19 March 2013 Paper

Multi-core fiber with integrated fiber Bragg grating for background free Raman sensing

Christoph Krafft, Sebastian Dochow, Ines Latka, Martin Becker, Ron Spittel, Jens Kobelke, Kay Schuster, Manfred Rothardt, Jürgen Popp

Proceedings Volume 8577, 85770J (2013) https://doi.org/10.1117/12.2004558

KEYWORDS: Raman spectroscopy, Fiber Bragg gratings, Fiber optics, Single mode fibers, Tissues, Light scattering, Refractive index, Fiber lasers, Optical filters, Spectroscopy

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Proceedings Article | 7 November 2012 Paper

Fiber Bragg gratings in few-mode highly birefringent microstructured optical fibers for sensing applications

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

Proceedings Volume 8421, 84217X (2012) https://doi.org/10.1117/12.974940

KEYWORDS: Fiber Bragg gratings, Micro optical fluidics, Polarimetry, Structured optical fibers, Neodymium, Optical sensing, Femtosecond phenomena, Transducers, Fiber optics sensors, Cladding

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Proceedings Article | 9 May 2012 Paper

Interferometric inscription of volume Bragg gratings in a commercial high-refractive index glass (S-TIH53) by 400 nm femtosecond (fs) laser pulses

T. Elsmann, A. Hartung, E. Lindner, M. Rothhardt, H. Bartelt

Proceedings Volume 8428, 84280H (2012) https://doi.org/10.1117/12.921787

KEYWORDS: Glasses, Fiber Bragg gratings, Absorption, Refractive index, Reflectivity, Interferometers, Reflection, Interferometry, Microscopes, Femtosecond phenomena

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Proceedings Article | 26 April 2012 Paper

Fibre Bragg gratings written in highly birefringent microstructured fiber as very sensitive strain sensors

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

Proceedings Volume 8426, 84260D (2012) https://doi.org/10.1117/12.922556

KEYWORDS: Fiber Bragg gratings, Micro optical fluidics, Birefringence, Structured optical fibers, Refractive index, Sensors, Femtosecond phenomena, Polarimetry, Laser sources, Reflectivity

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Proceedings Article | 26 April 2012 Paper

Strain characterization of suspended-core fiber tapers

Ricardo André, Susana Silva, Martin Becker, Kay Schuster, M. Rothhardt, H. Bartelt, Manuel Marques, Orlando Frazão

Proceedings Volume 8426, 84260G (2012) https://doi.org/10.1117/12.922812

KEYWORDS: Sensors, Cladding, Structured optical fibers, Fiber characterization, Refractive index, Single mode fibers, Head, Multimode fibers, Interferometers, Liquids

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Proceedings Article | 26 April 2012 Paper

In-fiber temperature measurement during optical pumping of Yb-doped laser fibers

Julia Fiebrandt, Martin Leich, Manfred Rothhardt, Hartmut Bartelt

Proceedings Volume 8426, 84260B (2012) https://doi.org/10.1117/12.922334

KEYWORDS: Optical fibers, Fiber Bragg gratings, Temperature metrology, Absorption, Optical pumping, Ytterbium, Doping, Fiber lasers, Annealing, Signal attenuation

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Proceedings Article | 25 April 2012 Paper

Characterization of fiber Bragg grating-based sensor array for high resolution manometry

Martin Becker, Manfred Rothhardt, Kerstin Schröder, Sebastian Voigt, Jan Mehner, Andreas Teubner, Thomas Lüpke, Christoph Thieroff, Matthias Krüger, Christoph Chojetzki, Hartmut Bartelt

Proceedings Volume 8439, 843902 (2012) https://doi.org/10.1117/12.921830

KEYWORDS: Sensors, Fiber Bragg gratings, Spatial resolution, Polymers, Fiber optics sensors, In vivo imaging, Finite element methods, Glasses, Optical fibers, Solids

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Proceedings Article | 31 January 2012 Paper

Tailored draw tower fiber Bragg gratings for various sensing applications

Eric Lindner, Julia Mörbitz, Christoph Chojetzki, Martin Becker, Sven Brückner, Kay Schuster, Manfred Rothhardt, Reinhardt Willsch, H. Bartelt

Proceedings Volume 8351, 835112 (2012) https://doi.org/10.1117/12.913625

KEYWORDS: Fiber Bragg gratings, Sensors, Coating, Fiber optics sensors, Fiber coatings, Reflectivity, Metals, Structured optical fibers, Optical fibers, Composites

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Proceedings Article | 31 January 2012 Paper

Regenerated single pulse fiber Bragg gratings for high temperature sensing

Eric Lindner, Christoph Chojetzki, Julia Mörbitz, Sven Brückner, Martin Becker, Manfred Rothhardt, Hartmut Bartelt

Proceedings Volume 8351, 835117 (2012) https://doi.org/10.1117/12.913624

KEYWORDS: Fiber Bragg gratings, Reflectivity, Hydrogen, Pulsed laser operation, Sensors, Sensing systems, Laser damage threshold, Temperature metrology, Sensor technology, Temperature sensors

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Proceedings Article | 31 August 2011 Paper

Growth and stability of UV and VIS femtosecond written fiber Bragg gratings in different rare earth doped fibers

Julia Fiebrandt, Eric Lindner, Martin Becker, Sven Brückner, Manfred Rothhardt, Hartmut Bartelt

Proceedings Volume 8007, 80070C (2011) https://doi.org/10.1117/12.905335

KEYWORDS: Fiber Bragg gratings, Doping, Ultraviolet radiation, Femtosecond phenomena, Fiber lasers, Reflectivity, Ytterbium, Absorption, Interferometers, Cerium

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Proceedings Article | 31 August 2011 Paper

160W single-mode single-frequency Yb-doped fiber laser with fiber Bragg grating inscribed by UV femtosecond exposure and two beam interference

Martin Becker, Sven Brückner, Eric Lindner, Martin Leich, Manfred Rothhardt, Sonja Unger, Hartmut Bartelt

Proceedings Volume 8007, 80070B (2011) https://doi.org/10.1117/12.904730

KEYWORDS: Fiber Bragg gratings, Fiber lasers, Femtosecond phenomena, Ultraviolet radiation, Interferometry, Modulation, Mirrors, Reflectivity, Refractive index, Reflectors

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Proceedings Article | 3 June 2011 Paper

Draw tower fiber Bragg gratings and their use in sensing technology

E. Lindner, J. Mörbitz, C. Chojetzki, M. Becker, S. Brückner, K. Schuster, M. Rothhardt, H. Bartelt

Proceedings Volume 8028, 80280C (2011) https://doi.org/10.1117/12.883774

KEYWORDS: Fiber Bragg gratings, Sensors, Coating, Metals, Fiber coatings, Fiber optics sensors, Reflectivity, Structured optical fibers, Fiber optics, Composites

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Proceedings Article | 18 May 2011 Paper

Fiber Bragg grating transverse load sensors using suspended core fibers for directional dependent strain measurement

Charles Jewart, Tong Chen, Kevin Chen, Eric Lindner, Julia Fiebrandt, Manfred Rothhardt, Kay Schuster, Jens Kobelke, Hartmut Bartelt

Proceedings Volume 7753, 775373 (2011) https://doi.org/10.1117/12.885149

KEYWORDS: Fiber Bragg gratings, Birefringence, Sensors, Fiber optics sensors, Finite element methods, Structured optical fibers, Polarizers, Silica, Femtosecond phenomena, Computer simulations

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Proceedings Article | 18 May 2011 Paper

Regenerated draw tower grating (DTG) temperature sensors

Eric Lindner, John Canning, Christoph Chojetzki, Sven Brückner, Martin Becker, Manfred Rothhardt, Hartmut Bartelt

Proceedings Volume 7753, 77536M (2011) https://doi.org/10.1117/12.884645

KEYWORDS: Fiber Bragg gratings, Reflectivity, Hydrogen, Optical fibers, Temperature sensors, Refractive index, Fiber optics sensors, Sensors, Pulsed laser operation, Excimer lasers

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Proceedings Article | 23 September 2010 Paper

Fiber Bragg grating inscription with UV femtosecond exposure and two beam interference for fiber laser applications

Martin Becker, Sven Brückner, Eric Lindner, Manfred Rothhardt, Sonja Unger, Jens Kobelke, Kay Schuster, Hartmut Bartelt

Proceedings Volume 7750, 775015 (2010) https://doi.org/10.1117/12.871009

KEYWORDS: Fiber Bragg gratings, Fiber lasers, Femtosecond phenomena, Hydrogen, Ultraviolet radiation, Reflection, Germanium, Mirrors, Interferometry, Femtosecond fiber lasers

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Proceedings Article | 22 July 2010 Paper

MAMMUT: mirror vibration metrology for VLTI

Izabela Spaleniak, Frank Giessler, Reinhard Geiss, Stefano Minardi, Thomas Pertsch, Ralph Neuhaeuser, Martin Becker, Manfred Rothhardt, Françoise Delplancke, Andrea Richichi, Serge Ménardi, Christian Schmid

Proceedings Volume 7734, 77343Y (2010) https://doi.org/10.1117/12.856898

KEYWORDS: Metrology, Mirrors, Interferometers, Telescopes, Prototyping, Phase measurement, Observatories, Laser optics, Interferometry, Sensors

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Proceedings Article | 14 May 2010 Paper

UV Bragg grating inscription in germanium-doped photonic crystal fibers

Thomas Geernaert, Martin Becker, Pawel Mergo, Tomasz Nasilowski, Jan Wojcik, Waclaw Urbanczyk, Manfred Rothhardt, Christoph Chojetzki, Hartmut Bartelt, Francis Berghmans, Hugo Thienpont

Proceedings Volume 7714, 77140S (2010) https://doi.org/10.1117/12.855763

KEYWORDS: Fiber Bragg gratings, Doping, Ultraviolet radiation, Photonic crystal fibers, Refractive index, Modulation, Germanium, Step index fibers, Specialty optical fibers, Fiber optics sensors

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Proceedings Article | 23 April 2010 Paper

Regenerated fiber Bragg gratings in non-hydrogen-loaded photosensitive fibers for high-temperature sensor networks

E. Lindner, C. Chojetzki, M. Becker, S. Brückner, M. Rothhardt, H. Bartelt

Proceedings Volume 7677, 76770H (2010) https://doi.org/10.1117/12.849517

KEYWORDS: Fiber Bragg gratings, Sensor networks, Reflectivity, Fiber optics sensors, Ultraviolet radiation, Temperature metrology, Sensors, Hydrogen, Refractive index, Fiber lasers

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Proceedings Article | 24 February 2010 Paper

Homogeneous catheter for esophagus high-resolution manometry using fiber Bragg gratings

Sebastian Voigt, Manfred Rothhardt, Martin Becker, Thomas Lüpke, Christoph Thieroff, Andreas Teubner, Jan Mehner

Proceedings Volume 7559, 75590B (2010) https://doi.org/10.1117/12.842033

KEYWORDS: Sensors, Fiber Bragg gratings, Esophagus, Optical fibers, Solid state electronics, Coating, Silicon, Prototyping, Transducers, Finite element methods

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Proceedings Article | 17 February 2010 Paper

Simple and monolithic picosecond pulse shaper based on fiber Bragg gratings

J. Rothhardt, S. Hädrich, T. Gotschall, J. Limpert, A. Tünnermann, M. Rothhardt, M. Becker, S. Brückner, H. Bartelt

Proceedings Volume 7580, 75801B (2010) https://doi.org/10.1117/12.841611

KEYWORDS: Fiber Bragg gratings, Picosecond phenomena, Reflectivity, Pulse shaping, Fiber optics, Pulsed laser operation, Fiber lasers, Polarization, Crystals, Step index fibers

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Proceedings Article | 5 October 2009 Paper

Regeneration of fiber Bragg gratings in photosensitive fibers without hydrogen loading

Eric Lindner, Christoph Chojetzki, Sven Brückner, Martin Becker, Manfred Rothhardt, Hartmut Bartelt

Proceedings Volume 7503, 75032W (2009) https://doi.org/10.1117/12.834574

KEYWORDS: Fiber Bragg gratings, Hydrogen, Reflectivity, Fiber lasers, Refractive index, Sensors, Annealing, Interferometers, Optical fibers, Color centers

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Proceedings Article | 5 October 2009 Paper

Guidelines for the characterization and use of fibre optic sensors: basic definitions and a proposed standard for FBG-based strain sensors

Wolfgang Habel, Ingolf Baumann, Francis Berghmans, Krzysztof Borzycki, Christoph Chojetzki, Karl-Heinz Haase, Leszek Jaroszewicz, Thomas Kleckers, Marc Niklès, Manfred Rothhardt, Vivien Schlüter, Luc Thévenaz, Moshe Tur, Marc Wuilpart

Proceedings Volume 7503, 75035E (2009) https://doi.org/10.1117/12.835362

KEYWORDS: Sensors, Fiber optics sensors, Fiber Bragg gratings, Standards development, Spatial resolution, Manufacturing, Data modeling, Optical fibers, Stress analysis, Temperature metrology

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Proceedings Article | 5 October 2009 Paper

Fluid-filled microstructured optical fibers and switching applications

Yiping Wang, Wei Jin, Long Jin, Xiaoling Tan, Hartmut Bartelt, Wolfgang Ecke, Klaus Moerl, Hartmut Lehmann, Jens Kobelke, Kerstin Schroeder, Reinhardt Willsch, Manfred Rothhardt, Liye Shan, Sven Brueckner, David J. Richardson

Proceedings Volume 7503, 75035W (2009) https://doi.org/10.1117/12.835040

KEYWORDS: Micro optical fluidics, Fiber Bragg gratings, Liquids, Refractive index, Microfluidics, Switches, Temperature metrology, Switching, Absorption, Structured optical fibers

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Proceedings Article | 5 October 2009 Paper

Fiber Bragg grating arrays for high resolution manometry

Martin Becker, Manfred Rothhardt, Sebastian Voigt, Andreas Teubner, Thomas Lüpke, Christoph Thieroff, Christoph Chojetzki, Hartmut Bartelt

Proceedings Volume 7503, 75037A (2009) https://doi.org/10.1117/12.835404

KEYWORDS: Fiber Bragg gratings, Sensors, Fiber optics sensors, Esophagus, Manufacturing, Optical fibers, Multiplexing, Sensing systems, Fiber optics, Distributed computing

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Proceedings Article | 5 August 2009 Paper

Temperature and strain characterization of Bragg gratings impressed with femtosecond laser radiation in suspended-silica-core fibers

Luís Fernandes, Martin Becker, Orlando Frazão, Manfred Rothhardt, Sven Brückner, Kay Schuster, Jens Kobelke, José Santos, Paulo V. S. Marques

Proceedings Volume 7386, 73861N (2009) https://doi.org/10.1117/12.839641

KEYWORDS: Optical fibers, Fiber Bragg gratings, Femtosecond phenomena, Silica, Temperature metrology, Refractive index, Cladding, Germanium, Pulsed laser operation, Bridges

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Proceedings Article | 5 August 2009 Paper

Fiber Bragg grating inscription with DUV femtosecond exposure and two beam interference

Martin Becker, Joachim Bergmann, Sven Brückner, Eric Lindner, Manfred Rothhardt, Kay Schuster, Jens Kobelke, Sonja Unger, Hartmut Bartelt, Luis Fernandes, Paulo V. S. Marques

Proceedings Volume 7386, 73862Y (2009) https://doi.org/10.1117/12.838605

KEYWORDS: Fiber Bragg gratings, Femtosecond phenomena, Interferometers, Silica, Mirrors, Fiber lasers, Germanium, Refractive index, Glasses, Absorption

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Fiber Bragg gratings (FBGs) are today fundamental components in fiber optics. They can be used as sensors, in signal processing, e.g. telecom applications, as wavelength stabilizers in fiber lasers or in dispersion compensators. However, there are applications where the demand for fiber Bragg gratings is not compatible with standard photosensitivity techniques like germanium doping or hydrogen loading. Examples are their use as laser-mirrors in spliceless all fiber fiber-laser solutions or the fiber Bragg grating inscription in suspended core all silica fibers for evanescent field sensing. Fiber Bragg grating inscription with femtosecond-laser exposure is a challenging new method to realize grating structures for waveguides made of materials which do not provide UV-photosensitivity. Especially fs-IR-inscription has been demonstrated for Bragg grating inscription in a variety of material systems such as boron-silica glass, sapphire and pure silica glass. The feasibility of the phase mask FBG inscription technique with DUV femtosecond lasers was also shown, which allows grating inscription even in pure silica microstructured fibers. The phase mask inscription method requires that the fiber will be placed directly behind the phase mask. While the laser beam should be focused onto the fiber to support nonlinear material interaction, this inscription method also leads to phase mask degradations, presumably due to non-bridging oxygen holes (NBOH). Our solution to avoid the mask degradation is to increase the space between fiber and phase mask by using a Talbot-interferometer. Another advantage is the wavelength versatility of this inscription setup. Due to the short temporal coherence length of the femtosecond pulses, the angular alignment variability of the interferometer mirrors is limited and restrictions concerning the wavelength versatility of the interferometer arise. Grating arrays in pure silica suspended core fibers are demonstrated as an example for the versatility of the inscription arrangement.

Proceedings Article | 20 May 2009 Paper

Microstrutured fibers with germanium doped core components

J. Kobelke, K. Schuster, A. Schwuchow, Y. Wang, S. Brückner, M. Becker, M. Rothhardt, J. Kirchhof, W. Ecke, R. Willsch, H. Bartelt

Proceedings Volume 7357, 735704 (2009) https://doi.org/10.1117/12.820614

KEYWORDS: Micro optical fluidics, Germanium, Optical fibers, Silica, Fiber Bragg gratings, Solids, Manufacturing, Absorption, Cladding, Ultraviolet radiation

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Proceedings Article | 19 February 2009 Paper

Two beam interferometric inscription of UV femtosecond fiber Bragg gratings

E. Lindner, M. Becker, S. Brückner, Y. Wang, M. Rothhardt, H. Bartelt

Proceedings Volume 7195, 71950D (2009) https://doi.org/10.1117/12.809092

KEYWORDS: Femtosecond phenomena, Fiber Bragg gratings, Ultraviolet radiation, Mirrors, Interferometers, Interferometry, Absorption, Temporal coherence, Fiber lasers, Amplifiers

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Proceedings Article | 16 May 2008 Paper

Sensing and splicing applications of small core Ge-doped photonic crystal fibers

Yiping Wang, Sven Brueckner, Jens Kobelke, Manfred Rothhardt, Wolfgang Ecke, Reinhardt Willsch, Hartmut Bartelt

Proceedings Volume 7004, 70041S (2008) https://doi.org/10.1117/12.785846

KEYWORDS: Single mode fibers, Fiber Bragg gratings, Fusion splicing, Photonic crystal fibers, Sensors, Reflectivity, Hydrogen, Interfaces, Temperature metrology, Spherical lenses

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Proceedings Article | 21 April 2008 Paper

The fabrication and characterization of fiber Bragg gratings in highly birefringent photonic crystal fibers for sensing applications

Thomas Geernaert, Tomasz Nasilowski, Karima Chah, Martin Becker, Manfred Rothhardt, Marcin Szpulak, Jacek Olszewski, Krzysztof Poturaj, Jan Wójcik, Waclaw Urbanczyk, Herman Terryn, Hartmut Bartelt, Francis Berghmans, Hugo Thienpont

Proceedings Volume 6990, 69900C (2008) https://doi.org/10.1117/12.781651

KEYWORDS: Fiber Bragg gratings, Birefringence, Sensors, Photonic crystal fibers, Single mode fibers, Multiplexing, Annealing, Step index fibers, Polarization, Excimer lasers

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Proceedings Article | 22 May 2007 Paper

Preparation and applications of germanium and fluorine doped microstructured fibers

K. Schuster, J. Kobelke, A. Schwuchow, M. Leich, M. Becker, M. Rothhardt, U. Röpke, J. Kirchhof, H. Bartelt, T. Geernaert

Proceedings Volume 6588, 658804 (2007) https://doi.org/10.1117/12.722470

KEYWORDS: Optical fibers, Germanium, Silica, Cladding, Capillaries, Micro optical fluidics, Glasses, Waveguides, Fluorine, Fiber Bragg gratings

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SPIE Journal Paper | 1 March 2006

Wavelength-switchable fiber grating laser with wavelength stabilization

Martin Becker, Manfred Rothhardt, H.-L. Althaus

OE, Vol. 45, Issue 03, 034202, (March 2006) https://doi.org/10.1117/12.10.1117/1.2179443

KEYWORDS: Fiber lasers, Fiber Bragg gratings, Semiconductor lasers, Reflection, Laser stabilization, Semiconductors, Diodes, Switching, Resonators, Laser resonators

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SPIE Journal Paper | 1 June 2005 Open Access

High-reflectivity draw-tower fiber Bragg gratings—arrays and single gratings of type II

Christoph Chojetzki, Manfred Rothhardt, J. Ommer, Sonja Unger, Kay Schuster, Hans-Rainer Mueller

OE, Vol. 44, Issue 06, 060503, (June 2005) https://doi.org/10.1117/12.10.1117/1.1927517

KEYWORDS: Reflectivity, Fiber Bragg gratings, Excimer lasers, Manufacturing, Sensors, Pulsed laser operation, Interferometers, Single mode fibers, Optical components, Ultraviolet radiation

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Proceedings Article | 16 November 2004 Paper

High-mechanical-strength single-pulse draw tower gratings

Manfred Rothhardt, Christoph Chojetzki, Hans Rainer Mueller

Proceedings Volume 5579, (2004) https://doi.org/10.1117/12.567801

KEYWORDS: Fiber Bragg gratings, Sensors, Reflectivity, Coating, Interferometers, Mirrors, Beam splitters, Temperature sensors, Optical fibers, Fiber optics sensors

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Proceedings Article | 29 July 2002 Paper

From photosensitive fibers to fiber Bragg grating sensor systems

Hartmut Bartelt, Stephan Grimm, Volker Hagemann, M. Rothardt, Wolfgang Ecke, Reinhardt Willsch

Proceedings Volume 4900, (2002) https://doi.org/10.1117/12.484592

KEYWORDS: Optical fibers, Fiber Bragg gratings, Sensors, Temperature metrology, Interferometry, Refractive index, Multiplexing, Doping, Sensing systems, Fiber optics sensors

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Proceedings Article | 31 August 2000 Paper

Highly sensitive micro-mechanical fiber Bragg grating acceleration sensor combined with a new multiplexable interrogation principle

Michael Willsch, Peter Kraemmer, Nils Theune, H. Hertsch, M. Rothardt, Wolfgang Ecke, M. Waechter

Proceedings Volume 4074, (2000) https://doi.org/10.1117/12.397904

KEYWORDS: Sensors, Fiber Bragg gratings, Modulation, Interferometers, Diodes, Wavelength division multiplexing, Signal detection, Reflectivity, Light sources, Temperature metrology

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Proceedings Article | 29 December 1999 Paper

Lifetime of fiber Bragg gratings under cyclic fatigue

Pascal Mauron, Philipp Nellen, Urs Sennhauser, Michael Trutzel, Daniel Betz, Lothar Staudigel, Volker Hagemann, Manfred Rothhardt

Proceedings Volume 3848, (1999) https://doi.org/10.1117/12.372775

KEYWORDS: Fiber Bragg gratings, Annealing, Corrosion, Modulation, Failure analysis, Refractive index, Sensors, Coating, Reflectivity, Information operations

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Proceedings Article | 24 September 1997 Paper

Characterization of chirped phase masks for UV applications by writing and investigation of fiber Bragg gratings

Manfred Rothhardt, Volker Hagemann, Ruediger Poehlmann, Siegmund Schroeter, Hans-Joerg Fuchs

Proceedings Volume 3099, (1997) https://doi.org/10.1117/12.281230

KEYWORDS: Fiber Bragg gratings, Silica, Diffraction gratings, Manufacturing, Fiber lasers, Diffraction, Ultraviolet radiation, Structured optical fibers, Excimer lasers, Electron beams

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