Dr. Johannes Kirchhof Profile

Dr. Johannes Kirchhof

at Leibniz-Institut für Photonische Technologien eV

SPIE Involvement:

Author

Publications (45)

Proceedings Article | 20 February 2014 Paper

Improvement of optical damage in specialty fiber at 266 nm wavelength

T. Tobisch, H. Ohlmeyer, H. Zimmermann, S. Prein, J. Kirchhof, S. Unger, M. Belz, K.-F. Klein

Proceedings Volume 8938, 89380G (2014) https://doi.org/10.1117/12.2041798

KEYWORDS: Fiber lasers, Pulsed laser operation, Ultraviolet radiation, Nd:YAG lasers, Lamps, Absorption, Silica, Fiber optics, Hydrogen, Laser applications

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Proceedings Article | 11 March 2013 Paper

Optical properties of cerium-codoped high power laser fibers

S. Unger, A. Schwuchow, S. Jetschke, S. Grimm, A. Scheffel, J. Kirchhof

Proceedings Volume 8621, 862116 (2013) https://doi.org/10.1117/12.2002399

KEYWORDS: Cerium, Optical fibers, Ytterbium, Absorption, Aluminum, Ultraviolet radiation, Luminescence, Doping, Refractive index, Hydrogen

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Proceedings Article | 26 July 2011 Paper

Fabrication and characterization of special microstructured fibers

J. Kobelke, K. Schuster, A. Schwuchow, D. Litzkendorf, R. Spittel, J. Kirchhof, H. Bartelt

Proceedings Volume 8001, 80011H (2011) https://doi.org/10.1117/12.889104

KEYWORDS: Optical fibers, Glasses, Silica, Micro optical fluidics, Bridges, Lanthanum, Capillaries, Oxides, Refractive index, Aluminum

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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 | 23 February 2011 Paper

Structured material combined HMO-silica fibers: preparation, optical and mechanical behavior

K. Schuster, J. Kobelke, D. Litzkendorf, A. Schwuchow, F. Lindner, J. Kirchhof, H. Bartelt, J.-L. Auguste, G. Humbert, J.-M. Blondy

Proceedings Volume 7934, 79340O (2011) https://doi.org/10.1117/12.873682

KEYWORDS: Optical fibers, Glasses, Silica, Refractive index, Cladding, Lanthanum, Ytterbium, Absorption, Signal attenuation, Supercontinuum generation

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Proceedings Article | 11 February 2011 Paper

Fibers and fiber-optic components for high-power fiber lasers

H. Zimer, M. Kozak, A. Liem, F. Flohrer, F. Doerfel, P. Riedel, S. Linke, R. Horley, F. Ghiringhelli, S. Desmoulins, M. Zervas, J. Kirchhof, S. Unger, S. Jetschke, T. Peschel, T. Schreiber

Proceedings Volume 7914, 791414 (2011) https://doi.org/10.1117/12.879622

KEYWORDS: Fiber lasers, Absorption, Optical fibers, Ytterbium, Phosphorus, Glasses, Refractive index, Aluminum, Cladding, Single mode fibers

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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 | 18 May 2010 Paper

Thin-disk-laser-pumped ytterbium-doped fiber laser with an output power in the kW range

A. Popp, A. Voss, Th. Graf, S. Unger, J. Kirchhof, H. Bartelt

Proceedings Volume 7721, 772102 (2010) https://doi.org/10.1117/12.854321

KEYWORDS: Fiber lasers, Cladding, Absorption, Mirrors, Disk lasers, Coating, Optical simulations, Ions, Active optics, Laser sources

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Proceedings Article | 15 May 2010 Paper

Dispersion tailored microstructured fibers: core dopant effects

J. Kobelke, K. Schuster, R. Spittel, A. Hartung, A. Schwuchow, J. Kirchhof, H. Bartelt

Proceedings Volume 7714, 771416 (2010) https://doi.org/10.1117/12.853636

KEYWORDS: Micro optical fluidics, Dispersion, Silica, Germanium, Cladding, Glasses, Waveguides, Manufacturing, Absorption, Optical fibers

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Proceedings Article | 26 February 2010 Paper

The influence of Yb2+ ions on optical properties and power stability of ytterbium-doped laser fibers

J. Kirchhof, S. Unger, A. Schwuchow, S. Jetschke, V. Reichel, M. Leich, A. Scheffel

Proceedings Volume 7598, 75980B (2010) https://doi.org/10.1117/12.841808

KEYWORDS: Ytterbium, Absorption, Ultraviolet radiation, Aluminum, Optical fibers, Ions, Luminescence, Silica, Glasses, Doping

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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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Proceedings Article | 17 February 2010 Paper

Temperature dependence of photodarkening kinetics

M. Leich, S. Jetschke, S. Unger, J. Kirchhof

Proceedings Volume 7580, 758009 (2010) https://doi.org/10.1117/12.845846

KEYWORDS: Color centers, Temperature metrology, Absorption, Annealing, Ytterbium, Thermal modeling, Thermal effects, Glasses, Time metrology, Fiber lasers

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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 | 20 May 2009 Paper

Microstructured fibers with high lanthanum oxide glass core for nonlinear applications

J. Kobelke, K. Schuster, D. Litzkendorf, A. Schwuchow, J. Kirchhof, H. Bartelt, V. Tombelaine, P. Leproux, V. Couderc, A. Labruyere

Proceedings Volume 7357, 735702 (2009) https://doi.org/10.1117/12.819821

KEYWORDS: Glasses, Lanthanum, Oxides, Silica, Optical fibers, Micro optical fluidics, Cladding, Refractive index, Aluminum, Signal attenuation

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Proceedings Article | 19 February 2009 Paper

Characterization of photodarkening processes in Yb doped fibers

S. Jetschke, U. Röpke, S. Unger, J. Kirchhof

Proceedings Volume 7195, 71952B (2009) https://doi.org/10.1117/12.807544

KEYWORDS: Ytterbium, Optical fibers, Color centers, Time metrology, Transmittance, Ions, Cladding, Switching, Manufacturing, Fiber lasers

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Proceedings Article | 19 February 2009 Paper

Comparison of silica-based materials and fibers in side- and end-pumped fiber lasers

Andreas Langner, Gerhard Schötz, Mario Such, Volker Reichel, Stephan Grimm, Martin Leich, Sonja Unger, Johannes Kirchhof, Björn Wedel, Volker Krause, Georg Rehmann

Proceedings Volume 7195, 71950Q (2009) https://doi.org/10.1117/12.808218

KEYWORDS: Optical fibers, Fiber lasers, Cladding, Silica, Doping, Semiconductor lasers, Signal attenuation, Phosphorus, Laser development, Laser applications

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Proceedings Article | 19 February 2009 Paper

Yb-doped silica-based laser fibers: correlation of photodarkening kinetics and related optical properties with the glass composition

J. Kirchhof, S. Unger, S. Jetschke, A. Schwuchow, M. Leich, V. Reichel

Proceedings Volume 7195, 71950S (2009) https://doi.org/10.1117/12.808918

KEYWORDS: Ytterbium, Glasses, Absorption, Ions, Luminescence, Optical fibers, Ultraviolet radiation, Aluminum, Optical properties, Oxygen

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Proceedings Article | 7 February 2009 Paper

Influence of aluminum-phosphorus codoping on optical properties of ytterbium-doped laser fibers

S. Unger, A. Schwuchow, S. Jetschke, V. Reichel, M. Leich, A. Scheffel, J. Kirchhof

Proceedings Volume 7212, 72121B (2009) https://doi.org/10.1117/12.808940

KEYWORDS: Optical fibers, Aluminum, Ytterbium, Absorption, Phosphorus, Refractive index, Luminescence, Fiber lasers, Glasses, Optical properties

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Proceedings Article | 22 April 2008 Paper

Multicomponent glass microstructured fibers for nonlinear applications

J. Kobelke, K. Schuster, S. Grimm, D. Litzkendorf, J. Kirchhof, A. Schwuchow, H. Bartelt, A. Gebhardt

Proceedings Volume 6990, 699005 (2008) https://doi.org/10.1117/12.780172

KEYWORDS: Glasses, Optical fibers, Silica, Cladding, Lanthanum, Germanium, Oxides, Capillaries, Aluminum, Signal attenuation

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Proceedings Article | 22 February 2008 Paper

Photodarkening in Yb-doped silica fibers: influence of the atmosphere during preform collapsing

S. Jetschke, S. Unger, A. Schwuchow, M. Leich, V. Reichel, J. Kirchhof

Proceedings Volume 6873, 68731G (2008) https://doi.org/10.1117/12.776638

KEYWORDS: Optical fibers, Ytterbium, Fiber lasers, Ions, Cladding, Oxygen, Luminescence, Glasses, Absorption, Near infrared

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Proceedings Article | 22 February 2008 Paper

A new material for high-power laser fibers

Andreas Langner, Gerhard Schötz, Mario Such, Thomas Kayser, Volker Reichel, Stephan Grimm, Johannes Kirchhof, Volker Krause, Georg Rehmann

Proceedings Volume 6873, 687311 (2008) https://doi.org/10.1117/12.761671

KEYWORDS: Fiber lasers, Optical fibers, Silica, Cladding, Signal attenuation, Refractive index, Doping, Fluorine, Semiconductor lasers, Laser development

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Proceedings Article | 5 February 2008 Paper

Optical properties of Yb-doped laser fibers in dependence on codopants and preparation conditions

S. Unger, A. Schwuchow, S. Jetschke, V. Reichel, A. Scheffel, J. Kirchhof

Proceedings Volume 6890, 689016 (2008) https://doi.org/10.1117/12.762967

KEYWORDS: Optical fibers, Ytterbium, Absorption, Phosphorus, Luminescence, Aluminum, Ultraviolet radiation, Fiber lasers, Ions, Glasses

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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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Proceedings Article | 22 February 2007 Paper

Preparation of large-mode-area laser fibers with microstructured cores

Jens Kobelke, Kay Schuster, Sonja Unger, Volker Reichel, Anka Schwuchow, Klaus Mörl, Johannes Kirchhof, Martin Leich

Proceedings Volume 6453, 64531T (2007) https://doi.org/10.1117/12.698985

KEYWORDS: Optical fibers, Cladding, Ytterbium, Absorption, Signal attenuation, Refractive index, Fiber lasers, Fluorine, Silica, Phosphorus

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Proceedings Article | 20 February 2007 Paper

Codoped materials for high power fiber lasers: diffusion behaviour and optical properties

Sonja Unger, Anka Schwuchow, Jan Dellith, Johannes Kirchhof

Proceedings Volume 6469, 646913 (2007) https://doi.org/10.1117/12.700161

KEYWORDS: Aluminum, Phosphorus, Glasses, Refractive index, Diffusion, Silica, Aluminium phosphide, Doping, Optical properties, Signal attenuation

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Proceedings Article | 1 March 2006 Paper

Refractive index and geometrical structure measurement of a core-doped photonic crystal fiber

Y. Youk, S. Kim, K. Oh, J. Kobelke, K. Schuster, J. Kirchhof, D. Kim

Proceedings Volume 6128, 61281P (2006) https://doi.org/10.1117/12.645723

KEYWORDS: Refractive index, Confocal microscopy, Sensors, Optical fibers, Photonic crystal fibers, Profiling, Light emitting diodes, Reflectivity, Waveguides, Signal detection

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Proceedings Article | 23 September 2005 Paper

Materials and technologies for microstructured high power laser fibers

J. Kirchhof, S. Unger, J. Kobelke, K. Schuster, K. Mörl, S. Jetschke, A. Schwuchow

Proceedings Volume 5951, 595107 (2005) https://doi.org/10.1117/12.622667

KEYWORDS: Optical fibers, Fiber lasers, Doping, Cladding, Refractive index, Absorption, Ytterbium, Boron, Solids, Aluminum

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Proceedings Article | 13 September 2005 Paper

Hollow ring defect in photonic crystal fibers for annulus mode profile

Soan Kim, U. Paek, Kyunghwan Oh, U. Ropke, J. Kirchhof, H. Bartelt

Proceedings Volume 5926, 59260N (2005) https://doi.org/10.1117/12.616309

KEYWORDS: Dispersion, Silica, Photonic crystal fibers, Single mode fibers, Cladding, Structured optical fibers, Solids, Optical fibers, Optical properties, Beam propagation method

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Proceedings Article | 23 May 2005 Paper

A new type of index guiding holey fiber with flexible modal birefringence control

Soan Kim, Y. Jung, U. Paek, K. Oh, U. Ropke, J. Kirchhof, Hartmut Bartelt

Proceedings Volume 5855, (2005) https://doi.org/10.1117/12.623409

KEYWORDS: Birefringence, Silica, Structured optical fibers, Dispersion, Optical properties, Cladding, Beam propagation method, Polarization, Waveguides, Anisotropy

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Proceedings Article | 4 April 2005 Paper

Dopant interactions in high-power laser fibers

Johannes Kirchhof, Sonja Unger, Anka Schwuchow, Sylvia Jetschke, Bruno Knappe

Proceedings Volume 5723, (2005) https://doi.org/10.1117/12.590021

KEYWORDS: Absorption, Optical fibers, Neodymium, Ytterbium, Aluminum, Refractive index, Luminescence, Silica, Glasses, Germanium

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Proceedings Article | 23 March 2005 Paper

High NA-fibers: silica-based fibers for new applications

Karl-Friedrich Klein, Hanns Eckhardt, Christiane Vincze, Stephan Grimm, Johannes Kirchhof, Jens Kobelke, Jim Clarkin, Gary Nelson

Proceedings Volume 5691, (2005) https://doi.org/10.1117/12.591683

KEYWORDS: Optical fibers, Cladding, Bridges, Silica, Signal attenuation, Polymers, Refractive index, Solids, Molecular bridges, Sodium

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Proceedings Article | 23 March 2005 Paper

Fiber-laser power scaling beyond the 1-kilowatt level by Nd:Yb co-doping

Volker Reichel, Klaus Moerl, Sonja Unger, Sylvia Jetschke, Hans-Rainer Mueller, Johannes Kirchhof, Thomas Sandrock, Alexander Harschack, Andreas Liem, Jens Limpert, Holger Zellmer, Andreas Tuennermann

Proceedings Volume 5777, (2005) https://doi.org/10.1117/12.611066

KEYWORDS: Optical fibers, Energy transfer, Semiconductor lasers, Silica, Neodymium, Materials processing, Laser marking, Fiber lasers, Ytterbium, Absorption

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Proceedings Article | 25 October 2004 Paper

Optical properties of microstructured optical fibers

Klaus Morl, Hans-Rainer Muller, Johannes Kirchhof, Jens Kobelke, Kirsten Gerth, Kay Schuster, Hartmut Bartelt

Proceedings Volume 5595, (2004) https://doi.org/10.1117/12.579736

KEYWORDS: Optical fibers, Dispersion, Capillaries, Cladding, Optical properties, Silica, Waveguides, Glasses, Solids, Structured optical fibers

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Proceedings Article | 9 July 2004 Paper

Mechanical and optical behavior of index guiding photonic crystal fibers (PCF)

Jens Kobelke, Kirsten Gerth, Johannes Kirchhof, Kay Schuster, Klaus Moerl, Claudia Aichele

Proceedings Volume 5360, (2004) https://doi.org/10.1117/12.527718

KEYWORDS: Optical fibers, Water, Silica, Absorption, Solids, Capillaries, Signal attenuation, Cladding, Liquids, Photonic crystal fibers

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Proceedings Article | 14 June 2004 Paper

Spatial distribution effects and laser efficiency in Er/Yb-doped fibers

Johannes Kirchhof, Sonja Unger, Anka Schwuchow, Sylvia Jetschke, Bruno Knappe

Proceedings Volume 5350, (2004) https://doi.org/10.1117/12.527958

KEYWORDS: Phosphorus, Diffusion, Aluminum, Luminescence, Ytterbium, Optical fibers, Erbium, Fiber lasers, Doping, Glasses

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Proceedings Article | 3 July 2003 Paper

Applications of pumped-multiplexed Yb-doped fiber lasers

Volker Reichel, Sonja Unger, Sven Bruckner, Klaus Morl, Hans-Rainer Muller, Johannes Kirchhof, Thomas Sandrock, Alexander Harschack

Proceedings Volume 4974, (2003) https://doi.org/10.1117/12.478266

KEYWORDS: Fiber lasers, Absorption, Ytterbium, Glasses, Semiconductor lasers, Mirrors, Dielectric mirrors, Silicon, Refractive index, Silica

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Proceedings Article | 1 July 2003 Paper

Fiber lasers: materials, structures and technologies

Johannes Kirchhof, Sonja Unger, Anka Schwuchow

Proceedings Volume 4957, (2003) https://doi.org/10.1117/12.498062

KEYWORDS: Aluminum, Diffusion, Fiber lasers, Glasses, Silica, Ytterbium, Doping, Neodymium, Luminescence, Cladding

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Proceedings Article | 5 April 2002 Paper

Gain, damage, and recovery at 1.3 um in Pr3+-doped arsenic sulfide fibers

Sylvia Jetschke, Anka Schwuchow, Jens Kobelke, Kay Schuster, Johannes Kirchhof

Proceedings Volume 4645, (2002) https://doi.org/10.1117/12.461660

KEYWORDS: Optical fibers, Glasses, Signal attenuation, Arsenic, Luminescence, Single mode fibers, Switching, Signal processing, Praseodymium, Gallium

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Proceedings Article | 26 March 2002 Paper

Transmission behavior of silica core: fluorine-doped cladding fibers in the visible and ultraviolet region

Sonja Unger, Johannes Kirchhof, Siegmund Schroeter, Anka Schwuchow, Holger Frost

Proceedings Volume 4616, (2002) https://doi.org/10.1117/12.463809

KEYWORDS: Silica, Doping, Absorption, Oxygen, Optical fibers, Ultraviolet radiation, Germanium, Diffusion, Aluminum, Fluorine

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Proceedings Article | 19 October 2001 Paper

High-power stability of optical fibers for the visible wavelength region

Johannes Kirchhof, Sonja Unger, Siegmund Schroeter, Anka Schwuchow, Holger Frost, Christhard Deter

Proceedings Volume 4579, (2001) https://doi.org/10.1117/12.444913

KEYWORDS: Chlorine, Diffusion, Optical fibers, Silica, Absorption, Ultraviolet radiation, Hydrogen, Cladding, Doping, Fluorine

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Proceedings Article | 10 December 1999 Paper

Heavy-metal oxide glasses as potential materials for VIS fiber laser

Kay Schuster, Johannes Kirchhof, Jens Kobelke, Anka Schwuchow, Michael Scheffler

Proceedings Volume 3849, (1999) https://doi.org/10.1117/12.372793

KEYWORDS: Glasses, Lead, Luminescence, Oxides, Absorption, Crystals, Fiber lasers, Upconversion, Thulium, Ytterbium

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Proceedings Article | 28 September 1998 Paper

Optical and thermal properties of rare earth containing low-phonon-energy glasses

Michael Scheffler, Johannes Kirchhof, Jens Kobelke, Kay Schuster, Anka Schwuchow

Proceedings Volume 3416, (1998) https://doi.org/10.1117/12.323376

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Proceedings Article | 28 September 1998 Paper

Chalcogenide glass multimode and single-mode fibers

Jens Kobelke, Johannes Kirchhof, Michael Scheffler, Anka Schwuchow

Proceedings Volume 3416, (1998) https://doi.org/10.1117/12.323400

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Proceedings Article | 5 June 1998 Paper

Stability and lifetime improvements of UV fibers for new applications

Karl-Friedrich Klein, Stefan Huettel, Ralf Kaminski, Johannes Kirchhof, Stephan Grimm, Gary Nelson

Proceedings Volume 3262, (1998) https://doi.org/10.1117/12.309468

KEYWORDS: Hydrogen, Optical fibers, Silicon, Spectroscopy, Chlorine, Temperature metrology, Silica, Absorption, Sensors, Ultraviolet radiation

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Proceedings Article | 27 February 1997 Paper

Neutron fluence and dose measurements by optical fibers

Henning Henschel, Otmar Koehn, S. Metzger, Marc Decreton, Paul de Vos, Olivier Deparis, Johannes Kirchhof, Stephan Grimm

Proceedings Volume 2867, (1997) https://doi.org/10.1117/12.267918

KEYWORDS: Optical fibers, Calibration, Absorption, Fiber coatings, Gamma radiation, Optical coatings, Optical testing, Sensors, Aluminum, Particles

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Showing 5 of 45 publications

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